KINDAI UNIVERSITY


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SUENAGA Yusaku

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FacultyDepartment of Science / Graduate School of Science and Engineering Research / Research Institute for Science and Technology
PositionProfessor
Degree
Commentator Guidehttps://www.kindai.ac.jp/meikan/326-suenaga-yuusaku.html
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Last Updated :2020/09/01

Research Activities

Research Areas

  • Nanotechnology/Materials, Functional solid-state chemistry
  • Nanotechnology/Materials, Polymer chemistry
  • Nanotechnology/Materials, Inorganic and coordination chemistry

Research Interests

  • Polymer Chemistry, Coordination Chemistry

Published Papers

  • Spectroscopic characterization of valence tautomeric behavior in a cobalt- dioxolene complex using an ancillary ligand containing quinoline groups, Takuto Mibu, Yusaku Suenaga, Takashi Okubo, Masahiko Maekawa, Takayoshi Kuroda-Sowa, Inorganic Chemistry Communications, Inorganic Chemistry Communications, 114, Feb. 2020 , Refereed
  • Crystal structure of a dinuclear Co complex with doubly bridged fluorides: Di-mu-fluoride bis{(2-pyridylmethyl)bis(2-quinolymethyl)amine} dicobalt(II) bis(tetrafluoroborate), [Co2(mu-F)2(pbqa)2](BF4)2, T. Mibu, Y. Suenaga, T. Okubo, M. Maekawa, T. Kuroda-Sowa, X-ray Structure Analysis Online, X-ray Structure Analysis Online, 35(10), 61 - 62, Oct. 2019 , Refereed
  • Synthese, structure and properties of dinuclear Co complexes with bis(catecholate) ligands -Effect of a quinoline ring in the terminal group-, Y. Suenaga, T. Mibu, T. Okubo, M. Maekawa, T. Kuroda-Sowa, Polyhedron, Polyhedron, 171, 480 - 485, 2019 , Refereed
  • Graft Polymerization of Acrylic Acid on the Surface of Mono-Disperse Polymer Particles Using RAFT Agents, Maina Urayama, Shintaro Okamura, Jun Nishimine, Yusaku Suenaga, KOBUNSHI RONBUNSHU, KOBUNSHI RONBUNSHU, 72(4), 184 - 189, 2015 , Refereed
    Summary:Mono-disperse poly(styrene-co-glycidyl methacrylate) particles were prepared by soap-free emulsion polymerization. Reversible addition fragmentation chain transfer (RAFT-1, -2) agents were binding through the linker molecule, ethylene glycol bis(3-aminopropyl)ether on the polymer particle surface. Loading capacity (LC) of RAFT agents, calculated by elemental analysis, it is 200 mu mol/g for RAFT-1 particles and 40 mu mol/g for RAFT-2 particles. This means RAFT agents are sintering inside polymer particles and react with amino groups in particles except for the amino groups on the surface. The radical polymerization of acrylic acid was accomplished with RAFT particles and initiator (AIBN) in ethanol solution. As a result, the mass of particles increases from 100 mg to 131 mg and the average molecular weight of polyacrylic acid methyester is M-w = 1.32 X 10(4)similar to 1.65 X 10(4) by GPC, using standard PSt. Mon-disperse particles, containing polyacrylic acid, show high stability in aqueous dispersions under neutral to alkali condition due to the strong electrostatic repulsion. At low pH values, the COOH group in the PAA backbone is protonated and stronger cooperative H-bonding is observed. This results in particle coagulation due to diminished hydrophilicity.
  • Crystal structure of dinuclear Co complex with doubly bridged fluoride and peroxo ligands: μ-fluoro μ-peroxo bis{tris(2-pyridylmethyl)amine} dicobalt(III) tris(tetrafluoroborate), [Co2(μ-F)(μ-O2) (tpa)2](BF4)3, SUENAGA Yusaku, X-ray Structure Analysis Online, X-ray Structure Analysis Online, 30, 57 - 58, Dec. 2014 , Refereed
  • Crystal structure of a dinuclear CoII complex with bridging fluoride ligands: Di-μ-fluorido-bis{tris[(6-methylpyridin-2-yl)methyl]amine}dicobalt(II) bis(tetrafluoridoborate), Masataka Inomata, Yusaku Suenaga, Acta Crystallographica Section E: Structure Reports Online, Acta Crystallographica Section E: Structure Reports Online, 70(11), m359 - m360, Oct. 04 2014 , Refereed
    Summary:Reaction of Co(BF4)2·6H2O with tris[(6-methylpyridin-2-yl)methyl]amiine in methanol results in a fluoride abstraction from BF4 -, yielding the unexpected title compound, [Co2F2(C21H24N4)2](BF4)2. The complex cation consists of two inversion-related [Co(C21H24N4)]2+ moieties bridged by a pair of fluoride ligands. The CoII cation is six-coordinated in a distorted octahedral geometry and forms a +II high-spin state. In the crystal, the complex cation and the BF4 - anion are connected by C - H⋯F hydrogen bonds, forming a three-dimensional network. An intramolecular C - H⋯F hydrogen bond is also observed.
  • Crystal Structure and Characterization of Trinuclear Cobalt(III) Complex with 2,3,6,7,10,11-Hexahydroxytriphenylene, Yusaku Suenaga, Honami Inada, Masataka Inomata, Ryotaro Yamaguchi, Takashi Okubo, Masahiko Maekawa, Takayoshi Kuroda-Sowa, CHEMISTRY LETTERS, CHEMISTRY LETTERS, 43(4), 562 - 564, Apr. 2014 , Refereed
    Summary:Trinuclear Co(III) complex [Co-3(III)(tpa)(3)(L)](BF4)(4) (tpa: tris-(2-pyridylmethyl)amine, H6L: 2,3,6,7,10,11-hexahydroxytriphenylene) is prepared from methanol solution. Single-crystal structure analysis revealed that the valency of the three cobalt ions is +3 and that the tris(dioxolene) bridging ligand is formally in the -5 [cat,cat,sq] oxidation state. This complex is stable in the entire temperature range investigated. Various-temperature magnetic susceptibility data for the compound displayed little variation in the range 2-300K, and the reason caused the distinct charge distribution on Co-L (L: bridging ligand) by the natural rigidity of the tripodal ligands. Also, its CH3CN solution exhibits a very strong NIR absorption arising from an internal ligand transition within the triphenylene ligand. Cyclic voltammetry (CV) measurements in CH3CN solution show three reversible cat sq redox waves for the triphenylene ligand.
  • Syntheses and antibody-antigen reaction of polystyrene particles containing dinitrophenyl groups, Japanese Journal of Polymer Science and Technology, Japanese Journal of Polymer Science and Technology, 68(11), 759 - 765, Nov. 2011
  • Syntheses, crystal structures and elecrochemical properties of bis(catechol)s with acetylene group, Science and Technology, Science and Technology, (23), 23 - 33, Feb. 2011
  • Preparation and characterization of polystyrene particles containing red pigments, Japanese Journal of Polymer Science and Technology, Japanese Journal of Polymer Science and Technology, 67(9), 530 - 536, Sep. 2010
  • Syntheses and characterization of Co(III) binuclear complexes linked by bis(catecholate); [Co2(dmbpy)4(thBu)]2+ and [Co2(dcbpy)4(thBu)]2+, Science and Technology, Science and Technology, 2009(21), 35 - 43, Feb. 2009
  • Preparation and Water-Dispersion Stability of Mono-Dispersed Polystyrene Particles Containing Poly(ethylene oxide) Chains, Yusaku Suenaga, Takuya Nakai, Natsuko Kobayashi, KOBUNSHI RONBUNSHU, KOBUNSHI RONBUNSHU, 66(11), 491 - 497, 2009
    Summary:Two species-reversible addition fragmentation chain transfer (RAFT) agents containing poly(ethylene oxide) (M(w)=350 and 2000) were obtained from condensed reactions between dithiobenzoic acid 4-(4-cyanopentanoic acid) ester (RAFT-A) and poly(ethylene oxide) monomethyl ether. Mono-dispersed polystyrene particles with poly(ethylene oxide) have been prepared by RAFT polymerization. The particle formation of mono-dispersed polystyrene was affected by the addition time of RAFT agent for dispersion polymerization in ethanol. The water dispersion stability of these mono-dispersed polystyrene particles was investigated using the transmittance at 500 nm in water dispersion solutions of these polystyrene particles The polystyrene particles that were prepared by RAFT agent containing poly(ethylene oxide) (M(w) = 2000) have better water dispersion stability than polystyrene particles without poly(ethylene oxide) or polystyrene particles prepared by RAFT agent containing poly (ethylene oxide) (M(w) = 350).
  • Effect of nitrogen-donor ancillary ligand on oxidation behavior of Co(III) binuclear complexes with conjugated bis(catecholate)ligands, Yusaku Suenaga, Yukiko Umehata, Yasuhiro Hirano, Toshie Minematsu, Cortlandt G. Pierpont, INORGANICA CHIMICA ACTA, INORGANICA CHIMICA ACTA, 361(9-10), 2941 - 2949, Jun. 2008
    Summary:Two binuclear complexes of cobalt(III) have been prepared with 3,3',4,4'-tetrahydroxy-5,5'-di-tert-butylbenzaldazine (H(4)thBu) as bis(catecholate) ligand and two different ancillary ligands, 2,2'-bipyridine (bpy) or 2,2'-dipyridylamine (dpa). These compounds were characterized by (1)H NMR spectra, electrochemical measurements and UV -Vis spectra. In one case, [Co(2)(dpa)(4)(thBu)](2+), electrochemical oxidation of the complexes occurs at the bridges as two closely spaced one-electron couples (E(1/2) = 1 mV and 168 mV versus Fc/Fc(+)). Chemical oxidation of [Co(2)(dpa)(4)(thBu)](2+) using Ag(+) is observed to occur as a stepwise two-electron process forming [Co(2)(dpa)(4)(thBu(Cat,SQ))](3+) or [Co(2)(dpa)(4)(thBu(SQ,SQ))](4+) by UV -Vis spectrum. However, [Co(2)(bpy)(4)(thBu)](2+) shows no change in electronic spectrum under the same conditions of oxidation. This illustrates the dependence of redox properties of the binuclear Co(III) complexes on the nature of the nitrogen-donor ancillary ligands. In this report we discuss the effect of two different nitrogen-donor ancillary ligands on the0 oxidation behavior of binuclear Co(III) complexes. (C) 2008 Elsevier B. V. All rights reserved.
  • 2-D silver(I) coordination polymer with octakis(benzylsulfanyl)naphthalene and twisted naphthalene structure, Science and Technology, Science and Technology, (18), 47 - 55, Feb. 2006
  • Binuclear complexes of Co(III) containing extended conjugated bis(catecholate) ligands, Y Suenaga, CG Pierpont, INORGANIC CHEMISTRY, INORGANIC CHEMISTRY, 44(18), 6183 - 6191, Sep. 2005
    Summary:Binuclear complexes of cobalt(III) have been prepared with 3,3',4,4'-tetrahydroxy-benzaldazine (H(4)thB), 3,3',4,4'tetrahydroxy-5,5'-dimethoxybenzaidazine (H(4)thM), and 3,3',4,4'-tetrahydroxydimethylbenzaldazine (H(4)thA) as bis(catecholate) ligands that link metal ions separated by 16 A through a conjugated bridge. In one case, [CO2(bpy) (4)(thM)](2+), stereodynamic properties observed in solution by H-1 NMR are associated with valence tautomerism, with formation of a labile hs-Co(II) species by electron transfer from the catecholate regions of the bridge. Electrochemical oxidation of the complexes occurs at the bridges as two closely spaced one-electron couples. Chemical oxidation Of [CO2(bPY) (4)(thB)](2+) with Ag+ is observed to occur as a two-electron process forming [CO2(bPY) (4)(thB(SQ,SQ))](4+). Attempted crystallization in the presence of air was observed to result in formation of the [Co(bpy)(2)(BACat)](+) (H(2)BACat, 3,4-dihydroxybenzaldehyde) cation by aerobic oxidation. Structural characterization is provided for the HAM ligand and [Co(bPY)2(BACat)](BF4).
  • Silver(l) compounds consisting of [2.2]paracyclophane: Reversible guest-driven solid-state transformation and incorporation behavior, T Kuroda-Sowa, SO Liu, Y Yamazaki, M Munakata, M Maekawa, Y Suenaga, H Konaka, H Nakagawa, INORGANIC CHEMISTRY, INORGANIC CHEMISTRY, 44(6), 1686 - 1692, Mar. 2005
    Summary:Reaction of [2.2]paracyclophane with silver(l) heptafluorobutyrate (AgC3F7CO2) has isolated three novel networks: [Ag-4(PCP)(C3F7CO2)(4)](.)pyrene (1), [Ag-4(PCP)(C3F7CO2)(4)](.)phen (phen = phenanthrene) (2), and [Ag-4(PCP)(C3F7CO2)(4)](.) fluorene (3), and an intercalation compound [Ag-4(PCP)(C3F7CO2)(4)](.)2benzene (4). All the four complexes exhibit two-dimensional (2D) sheet structures in which AgC3F7CO2 form an infinite chain and pcp acts as linkage. 1, 2, and 3 show 2D flat sheets with cavities in which guest molecules are situated, whereas 4 exhibits 2D zigzag layers between which guest benzene molecules are intercalated. Pcp shows mu-di-eta(1)-eta(2) coordination mode in 1, mu-tetra-eta(1) coordination mode in 2 and 3, and mu-tetra-eta(2) coordination mode in 4. The reversible guest exchanges were observed between complex 1, 2, or 3 and intercalation compound 4. It is unprecedented for metal-organic inclusion complexes that the guest exchange occurs where the guest is the solute molecule. Furthermore, 4 can release the guest, and the original framework was completely recovered after reincorporation of benzene. It should be noted that 4 can incorporate pyrene, phen, and fluorene to give 1, 2, and 3, respectively, after desorption.
  • 3D coordination polymers of [2.2]paracyclophane and in situ silver(I) perfluoro-dicarboxylates: effects of the dicarboxylate spacers and conformations on the formation of complexes, SQ Liu, H Konaka, T Kuroda-Sowa, M Maekawa, Y Suenaga, GL Ning, M Munakata, INORGANICA CHIMICA ACTA, INORGANICA CHIMICA ACTA, 358(4), 919 - 926, Mar. 2005
    Summary:Coordination polymers of [2.2]paracyclophane (pep) with in situ silver(l) perfluoro-dicarboxylates characterized by single crystal X-ray analysis are described. Structures are found to strongly depend on the dicarboxylate spacer (n). With disilver(l) tetrafluorosuccinate ((CF2)(n)(COOAg)(2), n = 2), 3D network with composition of [Ag-4(PCP)(C2F4(CO2)(2))(2)] (1) forms in which silver salts afford infinite double chains and pep act as linkages between chains. Changing the silver salt to disilver hexafluoroglutarate ((CF2)(n)(COOAg)(2), n = 3) produces 3D pillared-layer structure of composition of [Ag-4(pcp)(C3F6(CO2)(2))(2)] (.) THF (2) (THF = tetrahydrofuran), in which silver salts form 2D sheets and pep act as pillars between the sheets. With silver octafluoroadipate (HO2C(CF2),CO2Ag, n = 4), 2-fold interpenetrated diamond structure, [Ag-2(pcp)(2)(HO2CC4F8CO2)(2)](2) (.) 2toluene (3), is obtained in which silver-anion chains and silver-pcp chains are connected with each other in the perpendicular manner. The three complexes represent unprecedented metal-organic networks of silver(I) multicarboxylates and polycyclic aromatic compounds. Additionally, the effects of the dicarboxylate conformations as well as the solvents on the resulting structures were discussed. (c) 2004 Elsevier B.V. All rights reserved.
  • Synthesis and structural characterization of dinuclear iridium hydrido complex with 3,6-bis(2-pyridyl)tetrazine, [Ir-2(H)(4)(PPh3)(4)(bptz)](PF6)(2) center dot 4CH(2)O(2), M Maekawa, H Konaka, T Minematsu, T Kurorda-Sowa, Y Suenaga, M Munakata, INORGANICA CHIMICA ACTA, INORGANICA CHIMICA ACTA, 358(4), 1317 - 1321, Mar. 2005
    Summary:Reaction of the precursor Ir complex [Ir(H)(2)(PPh3)(2)(Me2CO)(2)]PF6 with 3,6-bis(2-pyridyl)tetrazine (bptz) in CH2Cl2 gave a novel dinuclear Ir hydrido complex [Ir-2(H)(4)(PPh3)(4)(bptz)](PF6)(2) center dot 4CH(2)Cl(2). Crystallographic study described an interesting coordination environment having a pi-pi interaction and H-1 NMR study showed unique uptield shifts of pyridyl rings that are likely induced by the ring current effect of neighboring PPh3 ligands. (c) 2004 Elsevier B.V. All rights reserved.
  • First crystallographic determination of dichloro-bridged dinuclear rhodium Cp* complex with neutral Me2CO molecules. [Rh-2(Cp*)(2)(mu-Cl)(2)(Me2CO)(2)](BF4)(2) (Cp* = eta(5)-C5Me5), M Maekawa, Y Kayanuma, A Nabei, T Kuroda-Sowa, Y Suenaga, M Munakata, INORGANICA CHIMICA ACTA, INORGANICA CHIMICA ACTA, 358(4), 1313 - 1316, Mar. 2005
    Summary:The single crystals 5 of dichloro-bridged dinuclear Rh-Cp* complex with neutral Me2CO molecules, [Rh-2(CP*)(2)(mu-Cl)(2)(Me-2-CO)(2)](BF4)(2) (CP* = eta(5)-C5Me5), was isolated and the structure was in first determined crystallographically. (c) 2004 Elsevier B.V. All rights reserved.
  • catena-Poly[[[diacetonitrilesilver(I)]-mu-2,11-dithia[3.3]paracyclophane-kappa S-2 : S '] tetrafluoroterephthalate tetrafluoroterephthalic acid acetonitrile tetrasolvate], SQ Liu, H Konaka, T Kuroda-Sowa, M Maekawa, Y Suenaga, GL Ning, M Munakata, ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, 60, M1504 - M1506, Oct. 2004
    Summary:The title compound, {[Ag-2(C16H16S2)(2)(C2H3N)(4)](C8F4O4) .2C(8)H(2)F(4)O(4).4C(2)H(3)N}(n) has been prepared from the reaction of 2,11-dithia[3.3]paracyclophane (dtpcp) and in situ silver(l) tetrafluoroterephthalate (TFTP2-) using an interface method. In the solid state the title compound forms two infinite chains, which are parallel to one another. One chain consists of [Ag-2(C16H16S2)(2)(C2H3N)4](n)(2n+) and the other is formed from TFTP2- and H2TFTP via O-c-H...O-c (c is carboxy) hydrogen- bonding interactions, with H...A distances of 1.72 (2) and 1.774 (19) Angstrom. The Ag-I ion is tetrahedrally coordinated by two acetonitrile N atoms and two dtpcp S atoms. The cyclophanes have inversion symmetry.
  • Porous copper(I) complexes of 2,11-dithia[3.3]paracyclophane: desorption and adsorption of guest molecules, SQ Liu, H Konaka, T Kuroda-Sowa, Y Suenaga, H Ito, GL Ning, M Munakata, INORGANICA CHIMICA ACTA, INORGANICA CHIMICA ACTA, 357(12), 3621 - 3631, Sep. 2004
    Summary:Four copper(I) complexes of 2,11-dithia[3.3]paracyclophane (dtpcp), [CuI(dtpcp)] . MeCN (1), [CuBr(dtpcp)] . MeCN (2), [CuCl(dtpcp)] . MeCN (3) and [Cu2I2(dtPCP)(2)] . Me-thf (4) (Me-thf = 2-methyltetrahydrofuran), have been synthesized and their molecular structures determined by X-ray crystallography. Complexes I and 2 are isostructural, and exhibit 31) networks with elliptical channels along a-axis, which are constructed by dtpcp molecules bridging zigzag CuI and CuBr chains, respectively. Complexes 3 and 4 are 21) porous sheet networks constructed by bridging the zigzag copper-dtpcp chains via rhombic ring of Cu2X2 (X = Cl or 1). All sheets in 3 are packed in an eclipsed manner through pi-pi stackings to generate channels along the a-axis. However, the 2D porous sheets in 4 are packed in an offset mode such that channels are not formed along c-axis. Complexes I and 2 can reversibly incorporate guest acetonitriles without collapse of structures, and the original frameworks of I and 2 are completely recovered after incorporation of guests which are confirmed by X-ray powder diffraction (XRPD) pattern and H-1 NMR spectrum. Additionally, complex I exhibits selectivity in size and polarity for guest inclusion. (C) 2004 Elsevier B.V. All rights reserved.
  • Syntheses and structural characterizations of novel mono- and dinuclear iridium hydrido complexes with polydentate nitrogen donor ligands, M Maekawa, T Minematsu, H Konaka, K Sugimoto, T Kuroda-Sowa, Y Suenaga, M Munakata, INORGANICA CHIMICA ACTA, INORGANICA CHIMICA ACTA, 357(12), 3456 - 3472, Sep. 2004
    Summary:New five mono- and dinuclear Ir hydrido complexes with polydentate nitrogen ligands, [Ir(H)(2)(PPh3)(2)(tptz)]PF6 (1), [Ir-2(H)(4)(PPh3)(4)(tptz)](PF6)(2.2)H2O (2.2H(2)O), [Ir(H)(2)(PPh3)(2)(tppz)]BF4 (3), [Ir-2(H)(4)(PPh3)(4)(tppz)](BF4)(2) (4) and [Ir-2(H)(4)(PPh3)(4) (bted)](BF4)(2).6CHCl(3) (5.6CHCl(3)), were systematically prepared by the reactions of the precursor Ir hydrido complex [Ir(H)(2)(PPh3)(2)(Me2CO)(2)]X (X=PF6 and BF4) With 2,4,6-tris(2-pyridyl)-1,3,5-triazine (tptz), 2,3,5,6-tetrakis(2-pyridyl)pyrazine (tppz) and 1,4-bis(2,2:6,2"-terpyridine-4'-yl)benzene (bted), and their structures and properties were characterized in the solid state and in solution. Each of the Ir hydrido complexes with polydentate nitrogen ligands crystallographically described a unique coordination mode. Their H-1 NMR spectra demonstrated unusual I H NMR chemical shifts of pyridyl rings that are likely induced by the ring current effect of neighboring ligands. (C) 2004 Elsevier B.V. All rights reserved.
  • Dinuclear silver(I) complexes of N,N '-dibenzyl-4,13-diaza-18-crown-6-ether and dibenzo-24-crown-8-ether, M Wen, M Munakata, Y Suenaga, T Kuroda-Sowa, M Maekawa, Kodai, I, POLYHEDRON, POLYHEDRON, 23(13), 2117 - 2123, Aug. 2004
    Summary:Three silver(I) coordination complexes of diaza- and dibenzo-crown ethers, [Ag(DDAc)](CF3SO3) (1), [Ag-2(DDAC)(CF3SO3)(2)] (2) and [Ag-2(DB24C8)(CF3SO3)(2)] (3) have been synthesized by using different molar ratios of ligand to silver triflate salt, and characterized structurally. A large excess of DDAC ligand leads to mononuclear complex 1, and a large excess of silver triflate gives rise to dinuclear complex 2, based on metal-heteroatom and metal-oxygen interactions. Ligand DB24C8 coordinates two silver(I) ions to afford dinuclear complex 3. (C) 2004 Elsevier Ltd. All rights reserved.
  • catena-Poly[[[diacetonitrilesilver(I)]-mu-2,11-dithia[3.3]paracyclophane-kappa S-2 : S ']hydrogenoctafluoroadipate, SQ Liu, H Konaka, T Kuroda-Sowa, M Maekawa, Y Suenaga, GL Ning, M Munakata, ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, 60, M865 - M867, Jun. 2004
    Summary:The title compound, {[Ag(C16H16S2)(C2H3N)(2)](C6HF8O4)}(n), forms two infinite chains, which are approximately perpendicular to each other. One chain consists of [Ag(C16H16S2)(C2H3N)(2)](n)(n+), and the other is formed from HOFA(-). (HOFA(-) is hydrogen octafluoroadipate) units via O-c - H ... Oc (c is carboxy) hydrogen-bonding interactions, with an H ... A distance of 1.66 (5) Angstrom. Each silver(I) cation lies on a crystallographic twofold rotation axis and has a tetrahedral geometry, defined by two N atoms belonging to two acetonitrile molecules and two S atoms from two 2,11-dithia[3.3]paracyclophane molecules. The cyclophanes have inversion symmetry.
  • Tris(solvent) iridium complex supported by the η5-penta-methylcyclopentadienyl ligand. Refinement of [Ir(η5-C5Me5)(Me2CO)2(H2O)](BF4)2, Science and Technolgy, Annual report of Research Institute for Science and Technology, Kinki Univ., Science and Technolgy, Annual report of Research Institute for Science and Technology, Kinki Univ., 16, 21 - 24, Feb. 2004
  • Crystal structure of chlorobis(1,10-phenanthroline)copper(II) tetrafluoroborate, [Cu(phen)2Cl]BF4, Masahiko Maekawa, Hisashi Konaka, Kunihisa Sugimoto, Yusaku Suenaga, Takayoshi Kuroda-Sowa, Megumu Munakata, Analytical Sciences: X-ray Structure Analysis Online, Analytical Sciences: X-ray Structure Analysis Online, 20(2), x71 - x72, 2004
    Summary:The title Cu(II) complex, [Cu(phen)2Cl]BF4 (phen = 1,10-phenanthroline), was characterized crystallographically, which shows the most near regular trigonal bipyramidal geometry in the five-coordinate [Cu(phen)2Cl]+ series. 2004 © The Japan Society for Analytical Chemistry.
  • Crystal structure of tri-μ-chloro-bis[(1,2,3,4,5-η)-1,2,3,4,5-pentamethyl-2,4- cyclopentadien-1-yl)]-diiridium Tetrafluoroborate with a Unique Trigonal- bipyramidal Ir2Cl3 Core, [Ir2(Cp*)2(μ-Cl)3]BF4 (Cp* = η5-C5Me5), Masahiko Maekawa, Yusaku Suenaga, Takayoshi Kuroda-Sowa, Megumu Munakata, Analytical Sciences: X-ray Structure Analysis Online, Analytical Sciences: X-ray Structure Analysis Online, 20(1), x11 - x12, 2004
    Summary:Colorless single crystals of a dinuclear Ir complex, [Ir2(Cp*)2(μ-Cl)3]BF4 (Cp* =η5-C5Me5), were obtained with a reaction of [Ir(Cp*)(Me2CO)3]2+ and triptycene under Ar. The crystal structure was determined using CCD single crystal XRD data. The two Ir atoms are μ2-bridged by three chloride atoms to provide a dinuclear structure with a unique trigonal-bipyramidal Ir2Cl3 core. 2004 © The Japan Society for Analytical Chemistry.
  • Syntheses, structures, and properties of intercalation compounds of silver(1) complex with [2.2]paracyclophane, M Munakata, SQ Liu, H Konaka, T Kuroda-Sowa, Y Suenaga, M Maekawa, H Nakagawa, Y Yamazaki, INORGANIC CHEMISTRY, INORGANIC CHEMISTRY, 43(2), 633 - 641, Jan. 2004
    Summary:Reaction of [2.2]paracyclophane (pcp) with silver(l) trifluoroacetate (AgCF(3)CO(2)) and silver(l) pentafluoroproprionate (AgC(2)F(5)CO(2)) has led to isolation of three novel intercalation polymers: [Ag(4)(PCP)(CF(3)CO(2))(4)](C(6)H(6)) (1), [Ag(4)(pcp)(CF(3)CO(2))(4)](C(6)H(3)Me(3)) (2), and [Ag(4)(PCP)(C(2)F(5)CO(2))(4)](PCP) (3). Structure studies using single crystal X-ray diffraction have shown that all compounds contain two-dimensional layered frameworks based on cation-pi interactions, in which pcp exhibits an unprecedented mu-tetra-eta(2) Coordination mode. Guest molecules which weakly interact with the host pcp via C-H(...)pi interactions are intercalated between layers. The guest-eliminated complexes (1a and 2a) and guest-reincorporated ones (1b or 1c and 2b or 2c), accompanied by small structural changes, were confirmed by (1)H NMR, thermogravimetric analysis, mass spectra, and X-ray powder diffraction patterns. The structural changes from 1 --> 1a --> 1c (=11) can take place reversibly in the process of exposure of 1 a to benzene vapor, The original framework of complex 2 is also completely recovered by immersing 2a in mesitylene as well as exposing it to mesitylene vapor.
  • Syntheses and crystal structures of the first iridium complexes with m- and p-terphenyl (tp). {[Ir-2(p-tp)(cod)(2)](BF4)(2) center dot 2CH(2)Cl(2)}(3) and [Ir(m-tp)(eta(5)-C5Me5)](BF4)(2), M Maekawa, Y Suenaga, T Kuroda-Sowa, M Munakata, INORGANICA CHIMICA ACTA, INORGANICA CHIMICA ACTA, 357(1), 331 - 338, Jan. 2004
    Summary:Novel two iridium terphenyl complexes were prepared and their structures were characterized crystallographically. The reaction of [Ir(cod)(2)]BF4 with p-terphenyl (p-tp) in CH2C2, was carried out to afford dinuclear Ir(I) complex {[Ir-2(p-tp)(cod)(2)](BF4)(2) (.) 2CH(2)Cl(2)}(3) (cod = 1, 5-cyclooctadiene) (1 (.) 2CH(2)Cl(2)), whereas the reaction of the intermediate [Ir(eta(5)-C5Me5)(MeCO)(3)](3+) in Me2CO with m-terphenyl (m-tp) was done to provide mononuclear Ir(III) complex [Ir(m-tp)(eta(5)-C5Me5)](BF4)(2) (2). In complex 1 (.) 2CH(2)Cl(2) two Ir atoms are eta(6)-coordinated to both sides of terminal benzene rings from the upper and lower sides in the p-tp ligand, while one Ir atom is eta(6)-coordinated to one side of the terminal benzene ring in the m-tp ligand in complex 2. Each crystal structure describes the first coordination mode found in metal complexes with the m- and p-tp ligands. (C) 2003 Elsevier B.V. All rights reserved.
  • Thermal transition behavior and crystal structure of octakis(phenylsulfanyl)naphthalene, Y Suenaga, A Ueda, T Kuroda-Sowa, M Maekawa, M Munakata, THERMOCHIMICA ACTA, THERMOCHIMICA ACTA, 400(1-2), 87 - 94, Apr. 2003
    Summary:The conformational properties of octakis(phenylsulfanyl)naphthatene (ophn) were examined by their X-ray structural and thermal analyses. Ophns have been prepared in two different conformations, i.e. the red and yellow forms. The yellow form consists of the aabbaabb and bbaabbaa isomers (the descriptions a and b denote side-chain phenyl moieties projecting above or below, respectively). Both isomers are alternately arrayed in the direction parallel to the c-axis. This crystal structure will not be formed with only the chiral compounds. From the DTA results, the crystal melting point (T-m1) of the red form appeared at around 201.3 degreesC, for the yellow form, T-m2 appeared at around 174.5 degreesC and the crystallization point (T,2) is 114.5 degreesC. Both crystals indicate an amorphous phase during cooling after melting, then the T-g = 60 degreesC. The phase transformation observed for the red and yellow forms is summarized on the basis of the thermal analysis and powder X-ray diffraction pattern. (C) 2002 Elsevier Science B.V. All rights reserved.
  • Syntheses and Structures fo Photochromic SilverⅠCoordination Polymers with cis.1,2.Dicyano.1,2.bis(2,4,5.trimethyl.3.thienyl)ethene, 42(6), 1928 - 1934, Apr. 2003
  • Crystal structure and photo-induced property of two-dimensional silver(I) complex with 1,3,5-tris(benzylsulfanyl)benzene, Y Suenaga, H Konaka, T Sugimoto, T Kuroda-Sowa, M Maekawa, M Munakata, INORGANIC CHEMISTRY COMMUNICATIONS, INORGANIC CHEMISTRY COMMUNICATIONS, 6(4), 389 - 393, Apr. 2003
    Summary:The silver(l) complex [Ag-2(3bsb)(2)(ClO4)(2)] (1) (3bsb; 1,3,5-tris(benzylsulfanyl)benzene) has been prepared and its molecular structure was determined by X-ray crystallography. In 1, the silver ion prefers a tetrahedral coordination geometry and produces a two-dimensional sheet structure containing dimeric units. Irradiation of this complex 1 with light changes its color from white to pink; heat or exposure to acetone vapor makes the irradiated sample revert back to white. However, only 3bsb has no characteristic like this photochromism. (C) 2003 Elsevier Science B.V. All rights reserved.
  • Construction of the Multidecker Anthacene-SilverⅠSystem by Intramolecularπ.πInteracions., 42(6), 1928 - 1934, Mar. 2003
  • Novel di- and trinuclear iridium complexes bridged by various bidentate nitrogen ligands, (15), 47 - 55, Feb. 2003
  • Syntheses and structural characterization of [2.2]paracyclophane complexes of rhodium and iridium supported by diene ligands, M Maekawa, N Hashimoto, K Sugimoto, T Kuroda-Sowa, Y Suenaga, M Munakata, INORGANICA CHIMICA ACTA, INORGANICA CHIMICA ACTA, 344, 143 - 157, Feb. 2003
    Summary:We systematically prepared nine [2.2]paracyclophane complexes of Rh and It, [Rh(eta(6)-PCP)(C2H4)(2)]BF4.THF 1 . THF (pcp = [2.2]paracyclophane),[Rh(il pcp)(diene)]BF4 (diene = 1,5-cyclooctadiene (cod) 2-CH2O2; 2,5-norbornadiene (nbd) 3), [RhAyl, Ti pcp)(diene)(2)](BF4)(2) (diene = cod 4; nbd 5), [Ir(eta(6)-PCP)(cod)]X (X = BF4 6a; ClO4 6b . CH2Cl2) and [Ir-2(eta(6), eta(6)-pcp)(cod)(2)]X-2 (X = BF4 7a; ClO4 7b), seven structures of which were crystallographically characterized. In complexes 1 . THF, 2 . CH2Cl2, 3 and 6b CH2Cl2, each of the Rh or It atoms are eta(6)-bonded to the upper side of the two decks in the pcp ligand to afford a mononuclear structure. The Rh or Ir atoms are supported by ethylene or diene ligands. The average C(pcp)=C(pcp) distance with the Rh or Ir atom of 1.411 (1.THF), 1.413 (2.CH2Cl2), 1.411 (3) and 1.419 Angstrom (6b.CH2Cl2) is longer than those (1.393, 1.393, 1.390 and 1.400 Angstrom) without a Rh or Ir atom, respectively. The average interannular distances between the two decks are 3.03 (1 . THF), 3.01 (2 . CH2Cl2), 3.04 (3) and 3.01 A (6b . CH2O2), respectively. In contrast, in complexes 4, 5 and 7b, two Rh or Ir atoms are eta(6)-coordinated to the upper and lower decks in the pcp ligand to provide a dinuclear structure. The Rh or Ir atoms are similarly supported by diene ligands. Two coordinating cod ligands in pcp complexes 4 and 7b are located in a staggered conformation against the pcp ligand, whereas two nbd ligands in complex 5 are located in an eclipse conformation. The average C(pcp)=C(pcp) distances with the Rh or Ir atom of 1.416 (4), 1.417 (5) and 1.420 Angstrom (7b) are longer than that (1.385 Angstrom) of the metal-free pcp ligand. The average interannular distances between the two decks are 3.04 (4), 3.05 (5) and 3.05 A (7b), respectively. On complexes 1.THF-7b, the average interannular distances of 3.01-3.05 A between the two decks were found to be shorter than that (3.09 A) of the metal-free pcp ligand, suggesting that the repulsive pi-interaction between the two decks is reduced by the coordination of the metal fragment with the diene ligand to the pcp ligand. In addition, the relationships between the intramolecular distances and the configuration of the two ethylenic bridges were quite obvious. If the interannular distance was shorter than 3.05 Angstrom, the configuration of the two ethylenic bridges was more likely a twisted cross type, and if the interannular distance was shorter than 3.01 Angstrom, the configuration was more likely a parallel type, accompanying with the structure conversion of the two ethylenic bridges and the slide of the two decks. In the 1 H NMR study, the stoichiometric 1: 1 reaction solution of [M(diene)](+) (M = Rh and It; diene = cod and nbd) and the pcp ligand in CD2Cl2 or (CD3)(2)CO at 23 degreesC showed two kinds of H-1 NMR signals, which led to assign as a major mononuclear pcp complex [M(eta(6)-pcp)(diene)] (+) and a minor metal-free pcp ligand. On the other hand, the stoichiometric 2:1 reaction solution of [M(diene)](+) and the pcp ligand in CD2Cl2 or (CD3)(2)CO at 23 degreesC revealed two kinds of H-1 NMR signals, which led to assign as a minor dinuclear pcp complex [M-2(eta(6)-pcp)(diene)(2)](2+) and a major mononuclear pcp complex [M(eta(6)-pcp)(diene)](+). These results suggest that the mononuclear pcp complex [M(eta(6)-pcp)(diene)](+) is more stable in solution. (C) 2002 Elsevier Science B.V. All rights reserved.
  • One, two-dimensional silverⅠcoordination polymer with poly(benzylsulfanyl)benzene and photo-induced property, 15(15), 25 - 33, Feb. 2003
  • Syntheses and structural studies on silver(I) coordination polymers with trans,trans-1,4-dipenyl-1,3-butadiene, Jian Chu Zhong, Megumu Munakata, Masahiko Maekawa, Takayoshi Kuroda-Sowa, Yusaku Suenaga, Hisashi Konaka, Inorganica Chimica Acta, Inorganica Chimica Acta, 342, 202 - 208, Jan. 10 2003
    Summary:For the purpose of investigation on the reactivity of silver(I) with multiphenyl diene and the effect of counteranions on silver(I) complexes, we selected several silver(I) salts to react with trans,trans-1,4-diphenyl-1,3-butadiene (dpbd). The treatment of AgClO4·H2O with dpbd afforded a 1-D W-type chain silver(I) coordination polymer [Ag(dpbd)(ClO4)] (1) and while the reaction of AgCF3CO2 with dpbd gave rise to a co-crystallization structure [Ag3(CF3CO2)3]·(dpbd) (2) in which silver(I) and trifluoroacetate form a 1-D supramolecular ladder chain. The measurements of electric conductivity show that polymer 1 exhibits semiconductive behavior and while polymer 2 is an insulator. The effect of counteranions and steric hindrance on the formation of these silver(I) complexes is also discussed. © 2002 Elsevier Science B.V. All rights reserved.
  • Porous silver(I) organometallic coordination polymer of triptycene, and the guest desorption and absorption, Ming Wen, Megumu Munakata, Yusaku Suenaga, Takayoshi Kuroda-Sowa, Masahiko Maekawa, Inorganica Chimica Acta, Inorganica Chimica Acta, 340, 8 - 14, Nov. 25 2002
    Summary:On the basis study of porous silver(I) complex of triptycene (tpty), [Ag3(tpty)3(ClO4)3](toluene)2 (1), its toluene desorbed complex (2) and absorbed complex (3) have been synthesized and confirmed by 1H NMR spectra and X-ray powder diffraction. In complex 1, a 3D architecture with triptycene exhibits an unprecedented μ-η2-η2 or μ-η2-η2-η1 coordination mode depending on the steric requirements of the network. The desorption and absorption of guest molecules occur in this complex accompanying the structure change. The potential study of these complexes for the rational control and synthesis of porous organometallic coordination network is discussed. © 2002 Elsevier Science B.V. All rights reserved.
  • Dinuclear silver(I) complexes of dibenzo-crown ethers and the mononuclear complex of aminobenzo-crown ether, Ming Wen, Masahiko Maekawa, Megumu Munakata, Yusaku Suenaga, Takayoshi Kuroda-Sowa, Inorganica Chimica Acta, Inorganica Chimica Acta, 338, 111 - 118, Oct. 14 2002
    Summary:Three silver(I) coordination complexes of crown ethers, [Ag([15]C6)(ClO4)2](THF) (1), [Ag(DB[21]C7)(H2O)]2(ClO4)2 (2) and [Ag(DB[24]C8)(CF3SO3)]2(acetone)2 (3) have been synthesized in different solvents and characterized structurally. The mononuclear complex 1 and two different dinuclear complexes 2 and 3 are shown in this work. Silver(I) ions are situated in a distorted pentagonal pyramidal geometry and form close dinuclear complex with DB[21]C7 based on cation-π interaction in η2-fashion. This coordination unit involves σ bonding at a part oxygen atoms of ligand oxygen base cavity and π-π interaction between two parallel phenyl groups. But in 3, each DB[24]C8 host contained two silver(I) ions as guest without cation-π and π-π interaction. © 2002 Elsevier Science B.V. All rights reserved.
  • Silver(I) complexes of dibenzo-18-crown-6-ether having cation-π and π-π interactions, Ming Wen, Megumu Munakata, Yusaku Suenaga, Takayoshi Kuroda-Sowa, Masahiko Maekawa, Inorganica Chimica Acta, Inorganica Chimica Acta, 332(1), 18 - 24, Apr. 17 2002
    Summary:Three silver(I) complexes of dibenzo-18-crown-6-ether (DB[18]C6), [Ag(DB[18]C6)(ClO4)](THF) (1), [Ag(DB[18]6)(CF3SO3)]2(acetone)2 (2) and [Ag(DB[18]C6)(CF3COO)]2(AgCF3COO) 2 (3) have been synthesized in different solvents and characterized structurally. In each complex, silver ions prefer an octahedral coordination geometry and form close dinuclear complex with DB[18]C6 based on cation-π interaction in η2-fashion. In particular, the coordination unit involving σ bonding at an oxygen group and π-π bonding between two benzene rings is quite unique. © 2002 Elsevier Science B.V. All rights reserved.
  • Syntheses and crystal structures of mononuclear [2.2]paracyclophane complexes of rhodium and iridium supported by the pentamethylcyclopentadienyl ligand [M(eta(6)-pcp)(eta(5)-C5Me5)](BF4)(2) (M = Rh and Ir), M Maekawa, N Hashimoto, T Kuroda-Sowa, Y Suenaga, M Munakata, INORGANICA CHIMICA ACTA, INORGANICA CHIMICA ACTA, 328, 254 - 258, Jan. 2002
    Summary:Mononuclear [2.2]paracyclophane complexes of Rh and Ir, [M(eta(6)-pcp)(eta(5)-C5Me5)](BF4)(2) (M = Rh (1) and Ir (2); pcp = [2.2]paracyclophane) were crystallized and their structures were first characterized crystallographically. On both pep complexes the metal atom is bonded to the benzene ring on one side of the pep ligand in the eta(6)-coordination mode. The metal atom is also supported by the eta(5)-C5Me5 ligand to afford a triple-decker sandwich structure. In Rh pep complex I the average Rh-C(pep) and Rh-C(C5Me5) distances are 2.284(2) and 2.161(2) Angstrom, respectively. The average C(pcp) = C(pcp) distance of 1.407(4) Angstrom with the Rh atom is longer than that (1.388(4) Angstrom) without a Rh atom. Similarly, the average Ir-C(pcp) and Ir-C(C5Me5) distances in Ir pcp complex 2 are 2.275(3) and 2.174(3) Angstrom, respectively. The average C(pcp) = C(pcp) distance of 1.410(4) Angstrom with the Ir atom is longer than that (1.388(4) Angstrom) without an Ir atom. It is interesting that the average interannular distances of 2.97 Angstrom for 1 and 2 between two decks of the pep ligand are shorter than that (3.09 Angstrom) of the metal-free pep ligand, indicative of the decrease of the repulsive pi-interaction between benzene rings. The Rh pep complex gave the well-resolved H-1 NMR signals of [Rh(eta(6)-pcp)(n(5)-C5Me5)](2+), whereas the Ir pep complex exhibited two kinds of H-1 NMR signals which were assigned as [Ir(eta(6)-pcp)(eta(5)-C5Me5)](2+) and [Ir-2(eta(6)-pcp)(eta(5)-C5Me5)(2)](4+) in (CD3)(2)CO at 23 degreesC. (C) 2002 Elsevier Science B.V. All rights reserved.
  • Benzopolythia compounds and di-nuclear silver complex with tri 1, 4, 5, 8, 9, 12 hexathiatriphenylene as new electron donor ligands: synthesis, crystal structure and properties, 14(14), 25 - 33, Jan. 2002
  • Silver(I) coordination polymer of 2,5-bis(4 ',5 '-bis(methylthio)-1 ',3 '-dithiol-2 '-ylidene)-1,3,4,6-tetrathiapentalene (TTM-TTP) and its highly conductive iodine derivative, JC Zhong, Y Misaki, M Munakata, T Kuroda-Sowa, M Maekawa, Y Suenaga, H Konaka, INORGANIC CHEMISTRY, INORGANIC CHEMISTRY, 40(27), 7096 - +, Dec. 2001
    Summary:The novel silver(I) coordination polymer with 2,5-bis(4',5'-bis(methylthio)-1',3'-dithiol-2'ylidene)-1,3,4,6-tetrathiapentalene (TTM-TTP), [Ag(TTM-TTP)(CF3SO3)](n) (1), which consists of 1-D waving chains, was synthesized and characterized. Polymer 1 can be also regarded as a 3-D supramolecular network formed via many shorter side-by-side and face-to-face (SS)-S-... contacts. This polymer and its iodine-doped compound 2 behave as semiconductors with σ(25°C) values of 7.1 x 10(-6) and 0.85 S cm(-1), respectively. [GRAPHICS]
  • A double-decker silver(I) coordination polymer of 1-methylpyrene with columnar aromatic stacks. Effect of substituting groups on structure of silver(I) complexes with polycyclic aromatic hydrocarbons, M Munakata, JC Zhong, T Kuroda-Sowa, M Maekawa, Y Suenaga, M Kasahara, H Konaka, INORGANIC CHEMISTRY, INORGANIC CHEMISTRY, 40(27), 7087 - +, Dec. 2001
    Summary:A novel silver(I) coordination polymer of I-methylpyrene (mpyr) with double-decker motifs, {[Ag-2(mpyr)(2)(ClO4)(2)]0.5benzene}(n) (1), was synthesized and characterized. Polymer I consists of I-D double-decker chains, which are formed by dimeric double-decker units ([Ag(mpyr)(ClO4)](2)) through the linkage of the perchlorate groups. In addition, the dimeric moieties between the adjacent chains are stacked to lead to column π-π stacks. Therefore, complex 1 can also be regarded as a 2-D stacking polymer, The effects of substituting groups, and other factors, on the structure of silver(I) complexes with polycyclic aromatic hydrocarbons are also discussed. [GRAPHICS]
  • A Bent Two coordinate Silver Complex with 2, 2, 3, 3 Terahydro 4, 4 dithia 1, 1 binaphthylidene, E57, 1 - 2, Dec. 2001
  • Crystal Structure of eta(5)-pentamethylcyclopentadienyl-eta(6)-toluene rhodium tetrafluoroborate, [Rh(Cp*)(eta 6-C6H5Me)](BF4)(2) (Cp* = eta(5)-C5Me5), M Maekawa, N Hashimoto, T Kuroda-Sowa, Y Suenaga, M Munakata, ANALYTICAL SCIENCES, ANALYTICAL SCIENCES, 17(11), 1361 - 1362, Nov. 2001
  • Silver Coordination Polymers of Cyclic Sulfur Ligand, 2, 2, 3, 3 Tetrahydro 4, 4 dithia 1, 1 binaphthylidene, 322, 133 - 137, Nov. 2001
  • A Novel 2 D Silver Acyclic Polyene Coordination Polymer Assembled with Linear Unsaturated Bridges, 322, 150 - 156, Nov. 2001
  • Carbon and nitrogen coordinated silver(I) polymers of 2,4,6-triphenoxy-1,3,5-triazine, M Munakata, M Wen, Y Suenaga, T Kuroda-Sowa, M Maekawa, M Anahata, POLYHEDRON, POLYHEDRON, 20(18), 2321 - 2327, Aug. 2001
    Summary:For the purpose of furthering the understanding of steric structure effects upon coordination behavior and exploring the possibility of non-planar complexation in the triazine system for formation of extended polymeric structures, 2,4,6-triphenoxy-1,3,5-triazine(tpotz) has been reacted with silver(I) perchlorate and trifluoromethanesulfonate. The crystal structures of [Ag(2)(tpotz)(3)(ClO(4))(2)] and [Ag(2)(tpotz)(2)(CF(3)SO(3))(2)(THF)] have been determined by single-crystal X-ray diffraction. Tpotz is rich in organic components that can offer potential sites for complexation, which can be utilized to generate an interesting array of organometallic compounds with one-dimensional chains. (C) 2001 Elsevier Science Ltd. All rights reserved.
  • Silver(I) complexes of triazine derivatives having stepped π-π interactions and 2D sheets, Megumu Munakata, Ming Wen, Yusaku Suenaga, Takayoshi Kuroda-Sowa, Masahiko Maekawa, Manabu Anahata, Polyhedron, Polyhedron, 20(15-16), 2037 - 2043, Jun. 30 2001
    Summary:Reactions of silver(I) perchlorate and triflate with the triazine ligands 2,4,6-trimethoxy-1,3,5-triazine (L1) and 2,4,6-triphenyl-1,3,5-triazine (L2) have provided three novel silver complexes: [Ag(L1)2](ClO4) (1), [Ag(L1)2](CF3SO3) (2) and [Ag2(L2)(CF3SO3)2] (3). The crystal structures of these complexes have been determined by single-crystal X-ray diffraction. Each complex exhibits distinct coordination behavior and different frameworks. Complex 1 has a 1D stepped framework in which one crystallographically independent metal center interacts with two L1 molecules and strong π-π interactions between the triazine planes of two L1 molecules exist. On the other hand, complex 2 has a herringbone-like molecular packing in which the triflate ions are arranged between mononuclear complex cations. In complex 3, L2 molecules are suspended between two double chains of silver triflate through the coordination to silver(I) ions to form the 2D sheet network structure. The factors that influence the crystal structure and packing are discussed. © 2001 Elsevier Science Ltd.
  • Spiral, Herringbone and Triple-decker Silver ■ Complexes of Benzopyrene Derivatives Assembled with Their η2 Coordinations, 40(13), 3191 - 3199, Jun. 2001
  • 1-D cyano-bridged heterometallic complexes consisting of 1,4,8,11-tetraazacyclotetradecanesilver(II) and tetracyanopalladium(II) or tetracyanoplatinum(II), Megumu Munakata, Jian Chu Zhong, Ichiro Ino, Takayoshi Kuroda-Sowa, Masahiko Maekawa, Yusaku Suenaga, Nobumitu Oiji, Inorganica Chimica Acta, Inorganica Chimica Acta, 317(1-2), 268 - 275, May 28 2001
    Summary:Two unprecedented bimetallic Ag(II) coordination polymers were synthesized and characterized in this paper. Treatment of [Ag(cyclam)](ClO4)2 and K2[Pd(CN)4]·3H2O generated [Ag(cyclam)Pd(CN)2(μ-CN)2]n (1). Reaction of [Ag(cyclam)](ClO4)2 with K2[Pt(CN)4]·3H2O afforded [Ag(cyclam)Pt(CN)2(μ-CN)2]n (2). The structures of 1 and 2 are similar and consist of 1-D zigzag chains which are linked via intermolecular hydrogen bonding interactions to give rise to 3-D networks. The structural features, IR, ESR and magnetic properties are discussed, respectively. To our knowledge, the complexes reported here are the first example of bimetallic Ag(II) coordination polymers with weak antiferromagnetic spin coupling. The primary results presented here can give an insight into the assembly of Ag(II) coordination polymers. © 2001 Elsevier Science B.V.
  • Three-dimensional silver((]G0001[))co-ordination polymer with pocket structures(共著), ┣DBJ. Chem. Soc., Dalton Trans.(/)-┫DB, ┣DBJ. Chem. Soc., Dalton Trans.(/)-┫DB, (20), 3620 - 3623, 2000
  • Syntheses and structures of dinuclear rhodium ((]G0001[)) complexes and 1-D zigzag-chain rhodium ((]G0001[)) co-ordination polymers bridged by rod-like bidentate nitrogen ligands (共著), J. Chem. Soc., Dalton Trans., J. Chem. Soc., Dalton Trans., (24), 4357 - 4362, 1999
  • Silver ((]G0001[)) Complex Assemblies with Nonplanar Aromatic Compounds (共著), Inorg. Chem., Inorg. Chem., 38(25), 5674 - 5680, 1999
  • Mobility of Silver ((]G0001[)) Ions around the Propeller Ligand, Hexaphenylbenzene (HPB), in Silver ((]G0001[))π-Complexes (共著), Inorg. Chem., Inorg. Chem., 38(25), 5668 - 5673, 1999
  • A novel double-strand helical motif in a two-dimensional polymeric complex of silver perchlorate with benzo[e]acephenanthrylene(共著), J. Chem. Soc. , Chem. Commun., J. Chem. Soc. , Chem. Commun., (16), 1545 - 1546, 1999
  • Silver((]G0001[)) tetraiodoethylene complexes with twisted olefin moiety(共著), Inorganica Chimica Acta, Inorganica Chimica Acta, 290(2), 251 - 255, 1999
  • Synthesis and crystal structure of tetranuclear copper((]G0001[)) and silver((]G0001[)) complexes bridge by 2-amono-1,3,4-thiadiazole(atdz) : [Cu4(atdz)6](ClO4)4・2CH3OH and [Ag4(atdz)Summary:Synthesis and crystal structure of tetranuclear copper((]G0001[)) and silver((]G0001[)) complexes bridge by 2-amono-1,3,4-thiadiazole(atdz) : [Cu<sub>4</sub>(atdz)<sub>6</sub>](ClO<sub>4</sub>)<sub>4</sub>・2CH<sub>3</sub>OH and [Ag<sub>4</sub>(atdz)<sub>6</sub>](ClO<sub>4</sub>)<sub>4</sub>(共著)
  • Construction of Metal Sandwich Systems Derived from Assembly of Silver((]G0001[)) Complexe with Polycyclic Aromatic Compounds(共著), J. Am. Chem. Soc., J. Am. Chem. Soc., 121(21), 4968 - 4976, 1999
  • Cationic Tetrasilver Complex of Hexaphenylbenzene(共著), Inorg. Chem., Inorg. Chem., 38(7), 1376 - 1377, 1999
  • S・・・S Contact-assembled tetrathiafulvalene derivatives of copper((]G0001[)) and silver((]G0001[)) co-ordination polymers and organic radical cation salt(共著), J. Chem. Soc. , Dalton Trans., J. Chem. Soc. , Dalton Trans., (19), 3255 - 3261, 1998
  • Construction of Copper((]G0001[)) Coordination Polymers of 1,2,4,5-Tetracyanobenzene with Zigzag Sheet and Porous Frameworks(共著), Inorg. Chem., Inorg. Chem., 37(21), 5651 - 5656, 1998
  • Supramolecular Silver((]G0001[)) Complexes with Highly Strained Polycyclic Aromatic Compounds(共著), J. Am. Chem. Soc., J. Am. Chem. Soc., 120(34), 8610 - 8618, 1998
  • Synthesis and crystal structure of dinuclear palladium((]G0001[)) dppm complex with 4-mercaptopyridine in the thione mode. [Pd2(μ-dppm)2(HpyS)2](ClO6)2・CH3OH(共著), Inorganica Chimica Acta, Inorganica Chimica Acta, 281(1), 116 - 119, 1998
  • Synthesis and structure of a novel bis(μ-η2-thianthrene)disilver((]G0001[)) bis(perchlorate)(共著), Inorganica Chimica Acta, Inorganica Chimica Acta, 271(1/2), 145 - 150, 1998
  • Synthesis and crystal structure of two ternary dicopper((]G0001[)) complexes having the unsymmetrical coordination arrangement bridged by 1,8-naphthyridine(napy). [Cu2(napy)2(Me2CO)](PF6)2・2Me・・・, Inorganica Chimica Acta, Inorganica Chimica Acta, 271(1/2), 129 - 136, 1998
    Summary:Synthesis and crystal structure of two ternary dicopper((]G0001[)) complexes having the unsymmetrical coordination arrangement bridged by 1,8-naphthyridine(napy). [Cu<sub>2</sub>(napy)<sub>2</sub>(Me<sub>2</sub>CO)](PF<sub>6</sub>)<sub>2</sub>・2Me<sub>2</sub>CO and [Cu<sub>2</sub>(napy)<sub>2</sub>(dppm)(CH<sub>3</sub>CN)](PF<sub>6</sub>)(共著)
  • Synthesis and crystal structure of dinuclear and tetranuclear palladium dppm complexes. [Pd-2(mu-dppm)(2)(vpy)Cl] and [Pd-4(mu-dppm)(4)(mu-X)(2)](ClO4)(2) (X = Cl, Br and I), M Maekawa, M Munakata, T Kuroda-Sowa, Y Suenaga, POLYHEDRON, POLYHEDRON, 17(20), 3657 - 3663, 1998
    Summary:Reaction of the intermediate [Pd-2(mu-dppm)(2)](2+) which was prepared from [Pd-2(mu-dppm)(2)X-2] (X = Cl, Br and I) and AgClO4 in ethanol with 2-vinylpyridine (vpy) afforded dinuclear Pd(I) dppm complex [Pd-2(mu-dppm)(2)(vpy)Cl] (1). When the intermediate [Pd-2(mu-dppm)(2)](2+) was allowed to stand for a few days, tetranuclear Pd dppm complex [Pd-4(mu-dppm)(4)(mu-X)(2)](ClO4)(2) (X = Cl (2); Br (3) and I (4)) was systematically formed. The structure for 1 and 2 were crystallographically determined. On complex 1 two Pd atoms are doubly bridged by two dppm ligands to form an eight-membered Pd2P4C2 framework in a twist-chair conformation. Each Pd atoms is also coordinated by the Cl atom and the N atom of vpy in unsymmetrical side-by-side mode. The Pd-Pd distance is 2.597(2) Angstrom and the torsion angle between two Pd2P4 plane is 43.2 degrees. On the other hand four Pd atoms on 2 are bridged by four dppm ligands to form a rectangular Pd-4 core, which is composed of the shorter Pd-Pd separations (2.590(1) Angstrom) and the close Pd ... Pd separations (3.818(2) Angstrom). The later Pd ... Pd separation is also bridged by the Cl atom. The Pd-P distance (2.351(1) Angstrom) bridging the close Pd ... Pd separation is rather longer than that (2.238(2) Angstrom) bridging the shorter Pd-Pd separation. (C) 1998 Elsevier Science Ltd. All rights reserved.
  • Preparation, characterization and X-ray crystal structures of I-2 and copper(II) complexes of 2,11-dithia[3.3]paracyclophane, M Yamamoto, LP Wu, T KurodaSowa, M Maekawa, Y Suenaga, M Munakata, INORGANICA CHIMICA ACTA, INORGANICA CHIMICA ACTA, 258(1), 87 - 91, May 1997
    Summary:The crystal structures of dtpcpI(4) (1), [CuCl2(dtpcp)(EtOH)] (2) and [CuBr2(dtpcp)(MeOH)] (3), where dtpcp = 2,11-dithia[3,3]-paracyclophane, have been determined by X-ray crystallography. Complex 1 contains two crystallographically independent I(2)dtpcpI(2) molecules in the unit cell, each having crystallographical -1(C-i) symmetry. The structures of both 2 and 3 consist of a one-dimensional array of copper(II) ions linked via dithia-bridged paracyclophane. While 1 is an electric insulator at room temperature, the iodine oxidation of 2 and 3 produced charge-transfer complexes which gave conductivities 10(-5.5) and 10(-6.9) S cm(-1), respectively. Both 2 and 3 show the typical ESR signals and normal magnetic moments for a dilute copper(II) ion at room temperature, but exhibit an antiferromagnetic coupling at low temperature through the conjugated rr system of the bridging ligand.
  • An S center dot center dot center dot S contact assembled tetranuclear copper(I) complex with sulfur-rich ligand, 4,5-ethylenedithio-1,3-dithiole-2-thione, J Dai, M Munakata, LP Wu, T KurodaSowa, Y Suenaga, INORGANICA CHIMICA ACTA, INORGANICA CHIMICA ACTA, 258(1), 65 - 69, May 1997
    Summary:A copper(I) complex with 4,5-ethylenedithio-1,3-dithiole-2-thione (C5H4S5), [Cu4I4(C5H4S5)(4)]infinity was synthesized and the molecular structure and packing were characterized crystallographically. The metal center is a stepped Cu4I4 core coordinated by two ligands C5H4S5 in different ways. One is bidentate coordinated through the thiocarbonyl group and the thioether group and the other is monodentate coordinated only through thiocarbonyl group. The Cu4I4 clusters are bridged by bidentate C5H4S5 molecules to form one-dimensional polymeric chains along the c-axis, and these chains form a three-dimensional network linked by interchain S ... S contacts. The shortest S ... S contact distance is 3.257(2) Angstrom. A crystal of the complex is triclinic with space group P (1) over bar, a=11.350(5) Angstrom, b=11.854(3) Angstrom, c=9.275(5) Angstrom, alpha=97.32(4)degrees,beta=112.35(4)degrees, gamma=67.67(2)degrees, V=1067.0(9) Angstrom(3), Z=2, R=0.034, R-w=0.051.
  • Syntheses, structures and properties of linear copper(I) coordination polymers with tetrakis(ethylthio)tetrathiafulvalene and tetrakis(propylthio)tetrathiafulvalene(共著), Inorganica Chimica Acta, Inorganica Chimica Acta, 261(2), 169 - 174, 1997
  • Double Hydrogen Bond-and π-π-Stacking-Assembled Two-Dimensional Copper(I) Complex of 2-Hydroxyquinoxaline(共著), Inorg. Chem., Inorg. Chem., 36(12), 2688 - 2690, 1997
  • A unique coordination polymer consisting of two parallel C5H4S5 molecules bridging two silver(I) ions(C5H4S5=4,5-ethylenedithio-1,3-dithiole-2-thione)(共著), Inorganica Chimica Acta, Inorganica Chimica Acta, 255(1), 163 - 166, 1997
  • Crystal Structure and Characterization of Trinuclear Cobalt(III) Complex with 2,3,6,7,10,11-Hexahydroxytriphenylene, Yusaku Suenaga, Honami Inada, Masataka Inomata, Ryotaro Yamaguchi, Takashi Okubo, Masahiko Maekawa, Takayoshi Kuroda-Sowa, CHEMISTRY LETTERS, CHEMISTRY LETTERS, 43(4), 562 - 564, Apr. 2014 , Refereed
    Summary:Trinuclear Co(III) complex [Co-3(III)(tpa)(3)(L)](BF4)(4) (tpa: tris-(2-pyridylmethyl)amine, H6L: 2,3,6,7,10,11-hexahydroxytriphenylene) is prepared from methanol solution. Single-crystal structure analysis revealed that the valency of the three cobalt ions is +3 and that the tris(dioxolene) bridging ligand is formally in the -5 [cat,cat,sq] oxidation state. This complex is stable in the entire temperature range investigated. Various-temperature magnetic susceptibility data for the compound displayed little variation in the range 2-300K, and the reason caused the distinct charge distribution on Co-L (L: bridging ligand) by the natural rigidity of the tripodal ligands. Also, its CH3CN solution exhibits a very strong NIR absorption arising from an internal ligand transition within the triphenylene ligand. Cyclic voltammetry (CV) measurements in CH3CN solution show three reversible cat sq redox waves for the triphenylene ligand.
  • Synthesis and characterization of a tri-nuclear Co(II) complex with a Bis(catecholate) ligand, Yusaku Suenaga, Yuki Nakaguchi, Yasuhiro Fujishima, Hisashi Konaka, Koji Okuda, INORGANIC CHEMISTRY COMMUNICATIONS, INORGANIC CHEMISTRY COMMUNICATIONS, 14(2), 440 - 443, Feb. 2011
    Summary:A tri-nuclear Co(II) complex of formula [CO(3)(phen)(3)(L1)(2)] [L1=2,2',3,3'-tetrahydroxy-benzaldazine, phen=1.10-phenanthroline] has been prepared. The complex was characterized by X-ray crystal analysis, ESI-MS and its UV-Vis spectrum. The room temperature value of chi(m)T is 7.50 emu K mol(-1), which is larger than the expected value of 5.58 emu K mol(-1) (for three isolated high spin Co(II) ions). When the temperature is lowered the chi(m)T product continuously decreases down to 5.0 K, which indicates the presence of antiferromagnetic coupling between the Coll ions. (C) 2010 Elsevier B.V. All rights reserved.
  • Syntheses and characterization of Co(III) binuclear complexes with bis(catecholate) ligands containing an acetylene linker, Yusaku Suenaga, Yasuhiro Hirano, Yukiko Umehata, Toshie Minematsu, INORGANICA CHIMICA ACTA, INORGANICA CHIMICA ACTA, 365(1), 505 - 512, Jan. 2011
    Summary:Three binuclear Co(III) complexes with 5,5'-(buta-1,3-diyne-1,4-diyl)bis(3-tert-butylcatechol) (L1), 5,5'-( 2,5-dimethoxy-1,4-phenylene)bis(ethyne-2,1-diyl)bis(3-tert-butyl-catechol) (L2) and 5,5'-(4,4'-(buta-1,3- diyne-1,4-diyl)bis(2,5-dimethoxy-4,1-phenylene))bis(ethyne-2,1-diyl)bis(3-tert-butyl-catechol) (L3) have been prepared. The triple bond-containing L1, L2 and L3 ligands were synthesized by a cross-coupling reaction. These complexes were characterized by elemental analyses, electrochemical measurements, H-1 NMR and UV-Vis spectra. In [Co-2(bpy)(4)(L1)](2+), electrochemical oxidation of the complexes occurs at the bridges as two closely spaced one-electron couples. UV-Vis spectra reveal that chemical oxidation of [Co-2(bpy)(4)(L1)](2+) using Ag+ occurs as a two-electron process forming [Co-2(bpy)(4)(L1(Cat,SQ))](3+) or [Co-2(bpy)(4)(L1(SQ,SQ))](4+). On the other hand, [Co-2(bpy)(4)(L2)](2+) and [Co-2(bpy)(4)(L3)](2+) exhibit different oxidation behavior under the same experimental conditions. In this report we discuss the role of the distance between the two metal atoms on the oxidative behavior of binuclear Co(III) complexes. (C) 2010 Elsevier B.V. All rights reserved.
  • 1D chain and 3D framework of silver(I) organo-metallic polymers self-assembled with triptycene, Ming Wen, Megumu Munakata, Yi-Zhi Li, Yusaku Suenaga, Takayoshi Kuroda-Sowa, Masahiko Maekawa, Manabu Anahata, POLYHEDRON, POLYHEDRON, 26(12), 2455 - 2460, Jul. 2007 , Refereed
    Summary:For the purpose of investigating the coordination behavior of sterically congested alkenes and exploring the possibility of non-planar complexation in the polycyclic aromatic system for formation of extended polymeric networks, triptycene (tpty) has been studied with regard to its complexation with the silver(I) ion. The crystal structures of [Ag(tpty)(THF)(2)](ClO4) (1) and [Ag-6(tPtY)(4)(CF3SO3)(2-)(H2O)(6)](CF3SO3)(4) (2) have been determined by single-crystal X-ray diffraction. The polycyclic aromatic hydrocarbon triptycene is found to offer a potential site for complexation, which can be utilized to generate an interesting array of organo-metallic polymers with one-dimensional (1D) chain and three-dimensional (3D) porous frameworks. (c) 2007 Elsevier Ltd. All rights reserved.
  • A MLCT-switched photochromic copper(II) coordination polymer with 1,2-bis(2 '-methyl-5 '-(4 ''-pyridyl)-3 '-thienyl)perfluorocyclopentene in crystalline phase, Megumu Munakata, Jing Han, Masahiko Maekawa, Yusaku Suenaga, Takayoshi Kuroda-Sowa, Atsuhiro Nabei, Hideaki Ensu, INORGANICA CHIMICA ACTA, INORGANICA CHIMICA ACTA, 360(8), 2792 - 2796, May 2007 , Refereed
    Summary:A novel Cu(II) coordination polymer with photochromic 1,2-bis(2'-methyl-5'-(4 ''-pyridyl)-3'-thienyl)perfluorocyclopentene (BM-4-PTP) was prepared and crystallographically characterized. Its photochromic behavior as well as magnetic property was investigated in crystalline phase. In complex [Cu(BM-4-PTP)Br-2(DMF)(2)] (1), each copper atom is bridged by two N atoms of BM-4-PTP, two Br atoms from anions and two O atoms of DMF in an slightly distorted octahedral geometry. The basal planar center is in turn linked by bidentate ligand forming a 1-D polymeric chain. Free ligand showed typical spectral changes upon appropriate optical excitation, indicating the reversible photochromism in crystalline phase. Complex 1 occurred reversible photoisomerization not only through the pi-pi* transition but also the MLCT transition in crystalline phase. On the other hand, the magnetic property of complex 1 has been investigated by means of ESR. The spectra slightly and reversibly changed in response to UV and visible light supporting the normal photoreactivity in crystalline phase. (C) 2006 Elsevier B.V. All rights reserved.
  • Photochromism of novel metal coordination polymers with 1,2-bis(2 '-methyl-5 '-(carboxylic acid)-3 '-thienyl)perfluorocyclopentene in the crystalline phase, Jing Han, Masahiko Maekawa, Yusaku Suenaga, Hideaki Ebisu, Atsuhiro Nabei, Takayoshi Kuroda-Sowa, Megumu Munakata, INORGANIC CHEMISTRY, INORGANIC CHEMISTRY, 46(8), 3313 - 3321, Apr. 2007 , Refereed
    Summary:Three new metal complexes with 1,2-bis(2'-methyl-5'-(carboxylic acid)-3'-thienyl)perfluorocyclopentene (BM-5-CATP) were synthesized and characterized by X-ray diffraction analysis. BM-5-CATP serves as a bis-monodentate ligand that bridges metal centers to generate three 1D polymers. The two thienyl rings in the three complexes adopt antiparallel fashions, and the distances of 3.39, 3.53, and 3.57 angstrom between the two reactive carbons are short enough to allow photocyclizations to occur in the crystalline phase. [Co(BM-5-CATP)(py)(2)(MeOH)(2)] (1) displayed effective photoisomerization in the crystalline phase. Interestingly, solvated 1 underwent a solid-state conversion upon heating to generate, through the release of the coordinated MeOH and rearrangement of the coordination geometry, the desolvated form (1a), while maintaining reversible photochromism. The removal of the solvent led to obvious changes in physical properties such as color and magnetic properties. The ESR spectra of 1 and 1a changed reversibly upon photoexcitation, indicating changes in coordination geometry accompanied by photoreaction. The magnetic susceptibilities of 1 and 1a showed no obvious changes, suggesting that the cobalt-cobalt interaction through the long bridging BM-5-CATP is less effective. Both [Cu(BM-5-CATP)(py)(3)](EtOH)(py)(1.8) (2) and [Zn(BM-5-CATP)(phen)(H2O)] (3) exhibited reversible photoreactions in the crystalline phase. However, 3 did not show remarkable spectral changes because of steric hindrance from the coordinated bulky phenanthroline and the intramolecular H bonds.
  • Two-dimensional silver(I) coordination polymer with twisted naphthalene rings, Y Suenaga, H Konaka, K Kitamura, T Kuroda-Sowa, M Maekawa, M Munakata, INORGANICA CHIMICA ACTA, INORGANICA CHIMICA ACTA, 351, 379 - 384, Jul. 2003
    Summary:The silver(I) complex of octakis(cyclohexylsulfanyl)-naphthalene (ochsn), [Ag-4(ochsn)(CF3COO)(4)](CH2Cl2) (1), has been prepared and its molecular structure was determined by X-ray crystallography. In 1, the silver ion prefers a tetrahedral coordination geometry comprised of two S atoms from the ochsn molecules and the two O atoms from the counter anion then producing two-dimensional sheet structure. Interestingly, the naphthalene ring in the complex has large deviations from planarity and end-to-end twists on the order of 35degrees. In contrast, the central naphthalene ring of ochsn shows almost a planar structure in the solid state. (C) 2003 Elsevier Science B.V. All rights reserved.
  • A variety of one-, two- and three-dimensional copper(I) and silver(I) co-ordination polymers assembled by 1,4-bis(4-pyridyl)butadiyne and 1,4-bis(2-pyridyl)butadiyne, M Maekawa, H Konaka, Y Suenaga, T Kuroda-Sowa, M Munakata, JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, 4160-4166(22), 4160 - 4166, 2000 , Refereed
    Summary:Four copper(I) and six silver(I) novel co-ordination polymers linked by 1,4-bis(4-pyridyl)butadiyne (4-bpbd) or 1,4-bis(2-pyridyl)butadiyne (2-bpbd) were prepared and seven structures crystallographically characterized, in order to illustrate the structural versatility of co-ordination polymers assembled by the Group 11 metal ions and rod-like nitrogen bidentate ligands with long spacers. Reaction of appropriate copper(I) and silver(I) salts with the 4-bpbd ligand affords 2-D interwoven copper(I) co-ordination polymers {[Cu(2)(4-bpbd)(3)(CH(3)CN)(2)]X(2)}(n) (X=PF(6) 1a . 2H(2)O or BF(4) 1b) and 1-D straight chain silver(I) co-ordination polymers {[Ag(4-bpbd)]X}(n) (X=NO(3) 2a . CH(3)CN, ClO(4) 2b . (CH(3))(2)CO or CF(3)SO(3) 2c . (CH(3))(2)CO), respectively. On the other hand, reaction of suitable salts with the 2-bpbd ligand provides a 3-D diamondoid copper(I) co-ordination polymer {[Cu(2-bpbd)(2)]BF(4)}(n) 3b, a 1-D zigzag chain silver(I) co-ordination polymer {[Ag(2-bpbd)(NO(3))]}(n) 4a and a 2-D braid sheet silver(I) co-ordination polymer {[Ag(2-bpbd)(CF(3)SO(3))]}(n) 4c, respectively. On the basis of these structural studies, the unique structural features and the dimensionality of the copper(I) and silver(I) co-ordination polymers are revealed.
  • Construction and conductivity of W-type sandwich silver(I) polymers with pyrene and perylene, M Munakata, LP Wu, T KurodaSowa, M Maekawa, Y Suenaga, K Sugimoto, INORGANIC CHEMISTRY, INORGANIC CHEMISTRY, 36(21), 4903 - 4905, Oct. 1997 , Refereed
  • Conference Activities & Talks

    • Syntheses and magnetic properties of di-nuclear Co complexes containing phenanthrene, [Co2(L)(tpa)2](PF6)2, Yusaku Suenaga, Yosuke Tanaka, Keishiro Tahara, Takuto Mibu, Masahiko Maekawa, Takashi Okubo, Takayoshi Kuroda-Sowa, 7th Asian Conference on Coordination Chemistry (ACCC 7),   2019 10 16
    • Synthesis and property of di-nuclear Co complexes connected by triple bonds, Takuto Mibu, Yusaku Suenaga, Masahiko Maekawa, takashi Okubo, Takayoshi Kuroda-Sowa, 7th Asian Conference on Coordination Chemistry (ACCC 7),   2019 10 16
    • Synthesis and property of Co dinuclear complexes-Effect of spacer length of catechol-, Takuto Mibu, Yusaku Suenaga,   2019 09 15
    • Surface polymerization on polymer particles using Co(II) binuclear complex, Yuki Matsubara, Yusaku Suenaga,   2019 07 12
    • Surface modification of polymer particles using ATRP polymerization, Yuki Matsubara, Yusaku Suenaga,   2019 03 17
    • Spin transition behavior of dinuclear cobalt complexes with biscatechol ligands connected by conjugated sysytem, Takuto Mibu, Yusaku Suenaga,   2019 03
    • Syntheses and properties of cobalt dinuclear complexes consisting of biscatechol connected by triple bond-Effect of ancillary ligand-, Takuto Mibu, Yusaku Suenaga,   2018 07 28
    • Surface modification of polymer particles using RAFT polymerization, Yuki Matsubara, Yusaku Suenaga,   2018 07 13
    • Synthesis and property of dinuclear Co complexes connected by triple bond, Takuto Mibu, Yusaku Suenaga,   2018 03 21
    • Syntheses and structure of mono-nuclear Co complex with catechol ligands-Effect of substituents-, Yusaku Suenaga,   2016 03 25
    • Grafting polymerization of aclylic acid and on the surface of mono-disperse polymer particles using photo rection, Maina Urayama, Aimi Sakaguchi, Yusaku Suenaga,   2015 07 17
    • Grafting polymerization of water soluble monomer on the surface of mono-disperse polymer particle using RAFT agents, URAYAMA Maina, SUENAGA Yusaku,   2014 11 06
    • Synthesis of biscatechol containing t-Bu group and property of binuclear Co complex, UWAI Kazuya, SUENAGA Yusaku, 64th JSCC Symposium,   2014 09 19
    • Structure and property of poly-nuclear Co complex containing triscatechol, INOMATA Masataka, SUENAGA Yusaku, 64th JSCC Symposium,   2014 09 19
    • Syntheses and Properties of Mono-disperse Functional Nanoparticles: Surface modification with polyacrylic acid., URAYAMA Maina, SUENAGA Yusaku,   2014 07 24
    • Syntheses and Characterization of Di-nuclear Co Complexes containing Tetrahydroxytriphenylene, SUENAGA Yusaku, KAJIGAYA Genki, OHSHIMA Yuki, 41st International Conference on Coordination Chemistry,   2014 07 22
    • Crystal Structure and Magnetic Property of Tri-nuclear Co Complex containing Triphenylene Ring, INOMATA Masataka, SUENAGA Yusaku, YABUMOTO Shiomi, 41st International Conference on Coordination Chemistry,   2014 07 22
    • Synthesis and property of binuclear Fe complex with 2,3,6,7-tertahydroxytriphenylene,   2013 11
    • Structure and property of trinuclear Co complex with triphenylene ring,   2013 11
    • Terahertz vibrational spectroscopy of poly(3-hydroxybutyrate) and nylon, 7th International Conference on Advanced Vibrational Spectroscopy,   2013 08 , 7th International Conference on Advanced Vibrational Spectroscopy
    • Syntheses and properties of highly mono-disperse functional nanoparticles: Surface modification with polythiophene,   2013 07
    • Polymerization of mono-dispersed polymer particles with oligothiophene on surfaces.,   2013 03
    • Syntheses and property of dinuclear Cobalt complexes by schiff’s base reaction.,   2013 03
    • Syntheses of Co mononuclear complex and properties of binuclear complex.,   2012 09
    • Syntheses and surface analysis of polymer particles with polyacrylic acid.,   2012 07
    • Specific selectivity in antibody-antigen reaction of polymer particles containing dinitrophenyl groups.,   2012 03
    • Preparation of polymer particles using RAFT polymerization,   2011 09
    • Syntheses and properties of polynuclear Co complexes with bis(catecholate) ligand,   2011 09
    • Silver(I) coordination complex with porous structure of bulky thiophenylether substituted aromatic componds., 242th ACS Meeting,   2011 08 , 242th ACS Meeting
    • Property and synthesis of polystyrene particles containing dinitrophenyl groups.,   2011 07
    • Synthesis and magnetic property of tri-nuclear Co(II) complex with bis(catecholate) ligand,   2010 12
    • Synthesis and characterization of tri-nuclear cobalt mixed valence complex with 2.3.6.7.10.11-hexahydroxytriphenylene,   2010 12
    • Syntheses and characterization of Co(III) binuclear complexes with bis(catecholate) ligands containing acetylene linker, The 2nd. Asian Conference on Coordination Chemistry,   2009 11 , The 2nd. Asian Conference on Coordination Chemistry
    • Enhancement of antibacterial ability of Zeolite by radiation exposure,   2009 06
    • Enhancement of antibacterial ability of Zeolite by radiation exposure,   2009 06
    • Oxidation behavior of binuclear cobalt complexes with bis(catecholate) ligands, ACS-AIChE Rocky Mountain Meeting,   2007 08 , ACS-AIChE Rocky Mountain Meeting
    • The Redox Behavior of Binuclear Metal Complexes with Bis(catecholate) Ligand,   2007 03
    • Syntheses and Properties of Binuclear Metal Complexes with Conjugated Bis(catecholate) Ligand.,   2006 09
    • Structures and Properties of Silver(I) Coordination Polymer with Benzylthioether Ligand,   2006 03
    • 2-Dimensional Silver(I) Coordination Polymer with Twisted Naphthalene Rings,   2005 12
    • Syntheses and Properties of Co(III) Dinuclear Complexes with π Conjugated Biscatecholate Ligands,   2005 09
    • Syntheses and structures of rhodium and iridium complexes with polycyclic aromatic hydrocarbon ligands,   2005 03
    • Syntheses and crystal structures of novel rhodium and iridium complexes with [2.2]paracyclophane, The 36th International Conference on Coordination Chemistry,   2004 07 , The 36th International Conference on Coordination Chemistry
    • Structure and Function of Silver Ⅰ Coordination Polymer with Aromatic Compounds,   2003 09
    • Structure and Photochromism of Silver Ⅰ Complexes with Diarylethene Derivative having Two Pyridyl Groups,   2003 09
    • Synthesis, Structure and Property of Porous Copper Ⅰ Complexes,   2003 09
    • Structural characterization of novel iridium complexes with polydentate nitrogen ligands in solution and in the solid state,   2003 03
    • Structure and properties of silverⅠcoordination polymer with thiophenyl substituted aromatic compound,   2003 03
    • Synthesis and Structure of Porous Two-Dimensional CopperⅠComplexes with Dithiaparacyclophane,   2003 03
    • Synthesis of Photochromic Dinuclear RhodiumⅡComplexes with Bisthienyl Maleimide.,   2003 03
    • Structure and photo-induced property of Silver(I) coordination polymer with benzyl groups,   2002 10
    • Syntheses of silverⅠcoordination polymer with 1,4,5,8?tetrathioether group substituted naphthalene ligand,   2002 10
    • Synthesis and Structure of Porous CopperⅠComplexes with Dithi-aparacyclophane,   2002 09
    • Synthesis of Photochromic Metal Complex with 1,2?Bis[4?methyl?2?(2?pyridyl)?5?thiazolyl]perfluorocyclopentene,   2002 09
    • Structures and Photochromism of cis?1,2?Dicyano?1,2?bis(2,4,5?trimethyl?3?thienyl)ethene?Diruthenium(Ⅱ,Ⅲ)Complex,   2002 09
    • Syntheses and crystal structures of mononuclear [2. 2] paracyclophane com-plexes of rhodium and iridium supported by the pentamethylcyclopentadienyl ligand [M(η6?pcp)(η6?C5Me5)] (BF4)2 (M=Rh and Ir),   2002 07
    • Crstal structure and photo?induced property of one, two?dimensional silverⅠcomplexes with poly(benzylsulfanyl)benzene,   2002 07
    • Syntheses of metal complexes with star-burst molecule consisting of π electron system,   2002 03
    • Structure and properties of copper complex with thiophenylether substituted aromatic ligands,   2002 03
    • Structure and thermal transition behavior of tiophenyl substituted aromatic compound,   2002 03
    • Efects of Metal Complexes and Antimicrobial Conpounds on Longevity of Cut-Gerbera Flowers,   2002 03
    • Search for Ethylene Binding Protein as a Marker of Ag Ions,   2002 03
    • Synthesis of Photochromic Molybdenum Complexes with Bis (thienyl) maleimide,   2002 03
    • Structure and Photochromism Dimolybdenum Complex and Dirhodium Complexes with cis 1, 2 Dicyano 1, 2 Bis (2, 4, 5 Trimethyl 3 Thienyl) Ethene,   2002 03
    • Synthesis and structure of novel rhodium and iridium complex with [2.2] paracyclophane,   2001 09
    • Synthesis and properties of copper coordination polymer with thiophenylether group substituted aromatic compounds,   2001 09
    • Synthesis and structure of silver coordination polymer with thiobenzylether group substituted aromatic compounds,   2001 09
    • Synthesis of Silver π Complexes with Diphenyl Derivatives,   2001 09
    • Structure and Photochromism of cis 1, 2 Dicyano 1, 2 bis (2, 4, 5 trimethyl 3 thienyl) ethene Dinuclear Molybdenum Complexes,   2001 09
    • Synthesis of Silver Complex Derived from 2, 3 Bis (2, 4, 5 trimethyl 3 thienyl) maleic anhydride,   2001 09
    • Syntheses and structures of rhodium and iridium paracyclophane complexes with Cp* as a support ligand,   2001 03
    • Synthesis and structure of metal coordination polymer with trinaphthene derivatives,   2001 03
    • Effect of Silver■ Complexes on Ethylene-Promoted Flower Blooming and Longevity ■ : Ethylene Activity Inhibition,   2001 03
    • Triple-decker, Spiral and Herringbone Silver ■ Complexes of Benzopyrene and the Derivatives,   2001 03
    • Synthesis and structure of metal coordination polymer with piezochromism,   2001 02

    Misc

    • Valence tautomeric behavior of tri-nuclear mixed-valence CoIII/CoII complex containing 2,3,6,7,10,11-hexahydroxytriphenylene (H6L), Y. Suenaga, M. Inomata, S. Yabumoto, R. Yamaguchi, T. Okubo, M. Maekawa, T. Kuroda-Sowa, 近畿大学理工学研究所研究報告, 30, 1, 10,   2018
    • Role of bulky thiophenylether substituted aromatic compounds as a linker in porous silver(I) coordination polymers, Y. Suenaga, S. Ueda, Y. Umehata, M. Maekawa, 近畿大学理工学総合研究所研究報告, 27, 25, 34,   2015
    • Excellent synthetic method of new electron donor molecules, hexathiatrinaphthylene derivatives and their high dimensional assembled complex, 1, 68,   2002 03
    • A Zigzag Chain Coordination Polymer Consisting of Silver (I) Ion having Square Planar Geometry, Inorganica Chimica Acta, 328, 105-110,   2002 , 10.1016/S0020-1693(01)00719-8
    • Particle size control of PVC, Yusaku Suenaga, Akira Akimoto, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 153, 1-3, 321, 323,   1999 08 15 , 10.1016/S0927-7757(98)00453-1
      Summary:We studied seeded emulsion polymerization which is one of the known particle-producing polymerization methods. The colloidal stability of a polymer latex in the vinyl chloride polymerization was improved by addition of emulsifier. When the emulsifier was added to the growing particles, without emulsifier excess in the water phase, the colloidal stability of the polymer latex was excellent. This result means that the occurrence of new fine particles (< 0.1 μm) was prevented. Also, the viscosity properties of plastisols consisting of polyvinylchloride (PVC) and dioctylphthalate (DOP) as plasticizer supported this result. Copyright (C) 1999 Elsevier Science B.V. All rights reserved.
    • Two-Dimensional Supramolecular Co-ordination Compounds of Silver((]G0001[))with Box Structures(共著), J. Chem. Soc. , Dalton Trans., 2737, 2741,   1999
    • Syntheses and Structures of Copper((]G0001[))and Silver((]G0001[))Coordination Polymers with Hexakis(methylthio)benzene(共著), Polyhedron, 18, 3/4, 429, 436,   1999 , 10.1016/S0277-5387(98)00314-3
    • Two-dimensional silver (I) compound with square mesh structure, [Ag (dcpz)] (ClO4) (dcpz=pyrazine-2,3-dicarbonitrile), Yusaku Suenaga, Takayoshi Kuroda-Sowa, Megumu Munakata, Masahiko Maekawa, Polyhedron, 18, 1-2, 191, 195,   1998 12 04 , 10.1016/S0277-5387(98)00284-8
      Summary:Silver (I) complex of pyrazine-23-dicarbonitrile (dcpz)[Ag (dcpz)] (ClO4) have been prepared and the molecular structure determined by X-ray crystallography The silver ion prefers an octahedral coordination geometry comprising four nitrogen atoms from four different dcpz molecules and two oxygen atoms from ClO - 4 anion molecule Each dcpz in turn bridges four Ag (I) centres leading to a square mesh arrangement of alternating metal cations and organic ligands The square mesh sheet accumulates along the c-axis directionconsisting of a channel structure © 1998 Elsevier Science Ltd All rights reserved.
    • Crystal Structure of Tetranuclear Palladium Complex Bridged by Bis(diphenylphosphino)methane, [Pd4(μ-dppm)4(μ-Cl)2](ClO 4)2·bpe, Masahiko Maekawa, Megumu Munakata, Takayoshi Kuroda-Sowa, Yusaku Suenaga, Analytical Sciences, 14, 2, 451, 453,   1998 , 10.2116/analsci.14.451
    • Crystal Structure of Bis(diphenylphosphino)methane Dipalladium(I) Nitrate Complex, [Pd2(μ-dppm)2(NO3)2], Masahiko Maekawa, Megumu Munakata, Takayoshi Kuroda-Sowa, Yusaku Suenaga, Analytical Sciences, 14, 2, 447, 449,   1998 , 10.2116/analsci.14.447
    • A Linear-Chain Copper((]G0001[))Coordination Polymer with Hexakis(metlylthio)benzene(共著), Acta Cryst. Sec. C, C54, 1566, 1569,   1998
    • Synthesis and structure of a two-dimensional copper(II) coordination polymer with 3,4,9,10-perylenetetracarboxylic acid and ethylenediamine, Y Suenaga, T Kuroda-Sowa, M Munakata, M Maekawa, POLYHEDRON, 17, 13-14, 2207, 2211,   1998 , 10.1016/S0277-5387(98)00043-6
      Summary:The crystal and molecular structure of a dinuclear copper(II) complex with 3,4,9,10-perylenetetracarboxylic acid (H(4)ptca) and ethylenediamine (en) [Cu-2(en)(4)(mu-ptca)] (EtOH)(2)(H2O)(6) has been determined by X-ray structural analysis. Each copper atom is coordinated by four-nitrogen atoms of two en molecules, one oxygen atom of bridging ptca(4-) and one water molecule in an octahedral arrangement. The resulting dinuclear copper(II) complex forms two-dimensional network through intermolecular hydrogen bonds between carboxylate of ptca4- and the water. (C) 1998 Elsevier Science Ltd; All rights reserved.
    • Self-assembly of Copper(I)and Silver(I)Complexes with Square Grid and Channel Structures, J. Chem. Soc. , Dalton Trans., 7, 1121, 1125,   1998
    • Crystal structure of dinuclear copper(I) complex with 1,2,4,5-tetramethylmercaptobenzene, [Cu(tmmb)I](2), Y Suenaga, M Maekawa, T KurodaSowa, M Munakata, H Morimoto, N Hiyama, S Kitagawa, ANALYTICAL SCIENCES, 13, 4, 651, 652,   1997 08 , 10.2116/analsci.13.651
    • Crystal structure of bis{cis-bis(diphenylphosphino)ethylene}palladium(0) acetone solvate, M Maekawa, T KurodaSowa, Y Suenaga, M Munakata, ANALYTICAL SCIENCES, 13, 2, 319, 320,   1997 04 , 10.2116/analsci.13.319
    • Reexamination of Crystal Structure of Bispotassium(μ-chloro)(bischloro)copper(I)with Infinite Chains K2(CuCl3), Anal. Sci., 13, 4, 647, 650,   1997
    • Comparative X-ray Studies of a Two-dimensional Copper(I)Coordination Polymer with 1,2,4,5-tetramethylmercaptobenzene(tmmb), [(CuX)2(tmmb)]n(X=Br, I), Yusaku SUENAGA, Masahiko MAEKAWA, Takayoshi KURODA-SOWA, Megumu MUNAKATA, Hiroshi MORIMOTO, Nobuyuki HIYAMA, Susumu KITAGAWA, Anal. Sci., 13, 6, 1047, 1049,   1997 , 10.2116/analsci.13.1047
    • Structure and H-1 NMR study of copper(I) complex with ethylene and tetramethylethylenediamine, Y Suenaga, LP Wu, T KurodaSowa, M Munakata, M Maekawa, POLYHEDRON, 16, 1, 67, 70,   1997 , 10.1016/0277-5387(96)00266-5
      Summary:A ternary copper(I) complex with ethylene and tetramethylethylenediamine (tmen) has been prepared and the structure characterized by the single crystal X-ray method. The copper atom is coordinated to two nitrogen atoms of tmen and an ethylene molecule in a trigonal-planar arrangement. The C=C bond distance of 1.36(1) Angstrom is slightly longer than that of the free ethylene (1.33 Angstrom ). In the H-1 NMR study, chemical shifts of ethylene protons at 5.46 ppm move upfield (4.16 ppm) upon coordination to copper(I). This indicates that the pi back donation from copper to the ethylene is rather weak compared with other metal-ethylene systems. Copyright (C) 1996 Elsevier Science Ltd
    • Self-assembly of copper(I) complexes into three-dimensional co-ordination polymers with channel networks by hydrogen bonding or by tridentate ligands, LP Wu, M Yamamoto, T KurodaSowa, M Maekawa, Y Suenaga, M Munakata, JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, 10, 2031, 2037,   1996 05
      Summary:Reaction of the appropriate copper(I) salt with 3-cyano-6-methylpyridin-2(1H)-one (Hcmp) gave three polymeric co-ordination compounds, [Cu(cmp)(Hcmp)(3)]. C5H12 1, [Cu-2(Hcmp)(4)(Me(2)CO)(2)][BF4](2) 2 and [Cu-5(cmp)(4)]ClO4 3, the structures of which have been determined by X-ray crystallography. Complex 1 contains a three-dimensional supramolecular framework of tetrahedral CuN4 centres linked by intermolecular hydrogen bonds through the pyridone N and O atoms. The open square microchannels created enclathrate n-pentane as the guest molecule. Complex 2 contains a dimeric unit weakly bound by the bridging acetone oxygen atoms. Each Hcmp moiety in the dimer is hydrogen-bonded pairwise to one adjacent Hcmp molecule belonging to the other dimer giving a one-dimensional array of copper atoms. The unique structural feature of complex 3 is that it does not involve hydrogen bonding as in 1 or 2, instead each cmp monoanion employs all its three functional groups bridging three copper atoms forming a supramolecular channel architecture containing a Cu-4 cluster. The results are discussed in terms of designing new inorganic solids by the self-assembly of copper(I) complexes.
    • Effect of Polycondensation Conditions on the Sequence Distributions and Properties of the Wholly Aromatic Copolyesters, 35, 1, 23,   1991

    Research Grants & Projects

    • Study on Polymerization of Polymeric Particles
    • Study on Synthesis, Structure and Properties of Polymeric Metal Complexes