2021/04/22 更新

写真a

ユカワ ヤスヒコ
湯川 靖彦
YUKAWA Yasuhiko
所属
教育研究院 自然科学系 地球・生物科学系列 教授
自然科学研究科 環境科学専攻 教授
理学部 理学科 教授
職名
教授
外部リンク

学位

  • 理学博士 ( 1984年3月   上智大学 )

研究キーワード

  • Coordination Chemistry

  • 錯体化学

研究分野

  • ナノテク・材料 / 無機・錯体化学

経歴(researchmap)

  • 日本学術振興会特定国派遣研究者(英国マンチェスター大学)

    2002年 - 2003年

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  • - Niigata University, Professor

    2001年

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  • - 新潟大学 教授

    2001年

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  • Niigata University, Associate Professor

    1992年 - 2001年

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  • 新潟大学

    1992年 - 2001年

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  • 新潟大学

    1987年 - 1992年

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  • 新潟大学

    1987年 - 1992年

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  • Joint Researcher at Sophia University

    1986年 - 1987年

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  • 上智大学 共同研究員

    1986年 - 1987年

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  • Visiting Researcher at Sophia University

    1985年 - 1986年

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  • 上智大学 客員研究員

    1985年 - 1986年

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  • Postdoctral Fellow, Japan Society for Promotion of Science

    1984年 - 1985年

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  • 日本学術振興会 奨励研究員

    1984年 - 1985年

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▶ 全件表示

経歴

  • 新潟大学   理学部 理学科   教授

    2017年4月 - 2021年3月

  • 新潟大学   自然科学研究科 環境科学専攻   教授

    2010年4月 - 2021年3月

  • 新潟大学   自然科学研究科 環境科学専攻   教授

    2010年4月 - 2021年3月

  • 新潟大学   自然環境科学科   教授

    2001年7月 - 2017年3月

  • 新潟大学   理学部   助教授

    1994年4月 - 2001年6月

  • 新潟大学   教養部   助教授

    1992年1月 - 1994年3月

  • 新潟大学   教養部   講師

    1987年4月 - 1992年9月

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学歴

  • 上智大学   理工学研究科   化学

    - 1984年

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    国名: 日本国

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  • 上智大学   Graduate School, Division of Science and Engineering

    - 1984年

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  • 上智大学   Faculty of Science and Engineering

    - 1979年

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  • 上智大学   理工学部   化学

    - 1979年

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    国名: 日本国

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所属学協会

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MISC

  • Changing mixed-valence state of hexacobalt cluster by substituting central metal ion and by electrochemical reduction - Different mixed-valence states of [M{Co(prolinato(2)}(6)](4+)(M = Ba2+ and La3+)

    T Komiyama, S Igarashi, Y Hoshino, Y Yukawat

    CHEMISTRY LETTERS34 ( 3 ) 300 - 301   2005年3月

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    記述言語:英語   出版者・発行元:CHEMICAL SOC JAPAN  

    Clusters, Ba{Co(prolinato)(2)}(6) and La{Co(prolinato)(2)}(6), which are bridged by prolinato ligands, were crystallized as [M{Co(prolinato)(2)}(6)](ClO4)(4). The Ba{Co(pro)(2)}(6) cluster has two Co-III and four Co-II and the La{Co(pro)(2)}(6) cluster has one Co-III and five Co-II; i.e., the mixed-valence state of the cobalt cluster is different according to the oxidation number of the central ion. The both mixed-valence clusters change into divalent hexacobalt clusters by electrochemical reduction.

    DOI: 10.1246/cl.2005.300

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  • Changing mixed-valence state of hexacobalt cluster by substituting central metal ion and by electrochemical reduction - Different mixed-valence states of [M{Co(prolinato(2)}(6)](4+)(M = Ba2+ and La3+)

    T Komiyama, S Igarashi, Y Hoshino, Y Yukawat

    CHEMISTRY LETTERS34 ( 3 ) 300 - 301   2005年3月

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    記述言語:英語   出版者・発行元:CHEMICAL SOC JAPAN  

    Clusters, Ba{Co(prolinato)(2)}(6) and La{Co(prolinato)(2)}(6), which are bridged by prolinato ligands, were crystallized as [M{Co(prolinato)(2)}(6)](ClO4)(4). The Ba{Co(pro)(2)}(6) cluster has two Co-III and four Co-II and the La{Co(pro)(2)}(6) cluster has one Co-III and five Co-II; i.e., the mixed-valence state of the cobalt cluster is different according to the oxidation number of the central ion. The both mixed-valence clusters change into divalent hexacobalt clusters by electrochemical reduction.

    DOI: 10.1246/cl.2005.300

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  • High Field EPR and Magnetic Studies of Exchange-Coupled Octahedral Lanthanide Centered [GdNi6] and [LnNi6] Clusters

    Angew. Chem. Int. Ed.44, 1997-2001   2005年

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  • High Field EPR and Magnetic Studies of Exchange-Coupled Octahedral Lanthanide Centered [GdNi6] and [LnNi6] Clusters

    Angew. Chem. Int. Ed.44, 1997-2001   2005年

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  • An Fe(III) wheel with a zwitterionic ligand: the structure and magnetic properties of [Fe(OMe)(2)(proline)](12)[ClO4](12)

    AAH Abu-Nawwas, J Cano, P Christian, T Mallah, G Rajaraman, SJ Teat, REP Winpenny, Y Yukawa

    CHEMICAL COMMUNICATIONS314-315 ( 3 ) 314 - 315   2004年2月

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    記述言語:英語   出版者・発行元:ROYAL SOC CHEMISTRY  

    The structure and magnetic properties of a dodecanuclear iron(III) wheel are reported, featuring a bridging zwitterionic ligand.

    DOI: 10.1039/b312947k

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  • An Fe(III) wheel with a zwitterionic ligand: the structure and magnetic properties of [Fe(OMe)(2)(proline)](12)[ClO4](12)

    AAH Abu-Nawwas, J Cano, P Christian, T Mallah, G Rajaraman, SJ Teat, REP Winpenny, Y Yukawa

    CHEMICAL COMMUNICATIONS314-315 ( 3 ) 314 - 315   2004年2月

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    記述言語:英語   出版者・発行元:ROYAL SOC CHEMISTRY  

    The structure and magnetic properties of a dodecanuclear iron(III) wheel are reported, featuring a bridging zwitterionic ligand.

    DOI: 10.1039/b312947k

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  • Synthesis and characterization of mixed-ligand ruthenium(III) complexes with oxalate and acetylacetonate ions

    Y Hoshino, M Eto, T Fujino, Y Yukawa, T Ohta, A Endo, K Shimizu, GP Sato

    INORGANICA CHIMICA ACTA357 ( 2 ) 600 - 604   2004年1月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE SA  

    Two mononuclear mixed-ligand ruthenium(III) complexes with oxalate dianion (ox(2-)) and acetylacetonate ion (2,4-pentanedionate, acac(-)), K-2[Ru(ox)(2)(acac)] (1) and K[Ru(ox)(acac)(2)] (2), were prepared as a candidate for a building block. In fact, reaction of complex 2 with manganese(II) sulfate gave a heterometallic tetranuclear complex, TBA[Mn-[]{(mu-ox)Ru-III(acac)(2)}(3)] (5) in the presence of tetrabutylammonium (TBA) bromide. The H-1 NMR, UV-Vis, selected IR and FAB mass spectral data of these complexes are presented. Both mixed-ligand ruthenium(III) complexes gave a Nernstian one-electron reduction step in 0.1 mol dm(-3) Na2SO4 aqueous solution on a mercury electrode at 25 degreesC. Comparison of observed reversible half-wave potentials with calculated values for a series of [Ru(ox)(n)(acac)(3-n)](n-)(n = 0-3) complexes by using Lever's ligand electrochemical parameters is presented. (C) 2003 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.ica.2003.06.001

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  • Preparation, Structures and Properties of Oxalato-bridged Binuclear Iron(III) Complex: [(acac)2Fe(μ-ox)Fe(acac)2] and [(acac)2Fe(μ-ox)Fe(acac)2]∙ CH2ClCH2Cl

    Inorg. Chim. Acta357 ( 1 ) 11 - 18   2004年1月

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  • Preparation, structures and properties of oxalate-bridged binuclear iron(III) complex: [(acac)(2)Fe(mu-ox)Fe(acac)(2)] and [(acac)(2)Fe(mu-ox)Fe(acac)(2)]center dot CH2CICH2Cl

    T Fujino, Y Hoshino, S Igarashi, Y Masuda, Y Yukawa

    INORGANICA CHIMICA ACTA357 ( 1 ) 11 - 18   2004年1月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE SA  

    An oxalate-bridged binuclear iron(III) complex, [(acac)(2)Fe(mu-ox)Fe(acac)(2)], (acac(-) = acetylacetonate anion and ox(2-) = oxalate anion) was prepared. The complex crystallized as two types of crystals under different conditions: one had 1,2-dichloroethane as a solvent molecule of crystallization 2, the other did not 1. Both compounds have been characterized by X-ray crystallography, infrared spectroscopy, and thermogravimetric analysis. Compound 1 has also been characterized by UN-Vis and H-1 NMR spectroscopies, mass spectrometry, and electrochemistry. In both crystals, each iron(III) is coordinated in an octahedral arrangement by the oxygen atoms of an oxalate-bridging ligand and four oxygen atoms belonging to peripheral acac ligands in an octahedral arrangement. The intermetallic distance of (FeFe)-Fe-... is 5.4368(9) Angstrom in 1 and 5.438(2) Angstrom in 2. Two iron(III) ions in each crystal are bridged by the oxalate and both lie in the oxalate-plane. The results of thermal analyses imply that the thermal stability of 2 is lower than that of 1. Cyclic voltammograms of 1 in acetonitrile and dichloromethane at low temperature showed two consecutive, quasi-Nernstian, one-electron reduction steps corresponding to the reduction of Fw(III)-Fe-III to Fe-III-Fe-II followed by the reduction of Fe-III-Fe-II to Fe-II-Fe-II. The electrochemical comproportionation constants (K-c) of the equilibrium (Fe-III-Fe-III) + (Fe-II-Fe-II) = 2(Fe-III-Fe-II) are 10(8.9) in acetonitrile medium and 10(8.5) in dichloromethane, respectively. The considerably large K-c values indicate that the main factor contributing to the stabilization of the Fe-III-Fe-II mixed-valence state is electronic delocalization through the oxalate-bridge. (C) 2003 Elsevier B.V. All rights reserved.

    DOI: 10.1016/S0020-1693(03)00435-3

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  • Synthesis and characterization of mixed-ligand ruthenium(III) complexes with oxalate and acetylacetonate ions

    Y Hoshino, M Eto, T Fujino, Y Yukawa, T Ohta, A Endo, K Shimizu, GP Sato

    INORGANICA CHIMICA ACTA357 ( 2 ) 600 - 604   2004年1月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE SA  

    Two mononuclear mixed-ligand ruthenium(III) complexes with oxalate dianion (ox(2-)) and acetylacetonate ion (2,4-pentanedionate, acac(-)), K-2[Ru(ox)(2)(acac)] (1) and K[Ru(ox)(acac)(2)] (2), were prepared as a candidate for a building block. In fact, reaction of complex 2 with manganese(II) sulfate gave a heterometallic tetranuclear complex, TBA[Mn-[]{(mu-ox)Ru-III(acac)(2)}(3)] (5) in the presence of tetrabutylammonium (TBA) bromide. The H-1 NMR, UV-Vis, selected IR and FAB mass spectral data of these complexes are presented. Both mixed-ligand ruthenium(III) complexes gave a Nernstian one-electron reduction step in 0.1 mol dm(-3) Na2SO4 aqueous solution on a mercury electrode at 25 degreesC. Comparison of observed reversible half-wave potentials with calculated values for a series of [Ru(ox)(n)(acac)(3-n)](n-)(n = 0-3) complexes by using Lever's ligand electrochemical parameters is presented. (C) 2003 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.ica.2003.06.001

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  • The comparison of crystal structures of lanthanide complexes with 3,12-bis(carboxymethyl)-6,9-dioxa-3, 12-diazatetradecanedioic acid (H(4)egta)

    Y Inomata, D Okamura, K Morita, Y Yukawa, FS Howell

    JOURNAL OF MOLECULAR STRUCTURE659 ( 1-3 ) 23 - 34   2003年10月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE BV  

    Nine lanthanide complexes with 3,12-bis(carboxymethyl)-6,9-dioxa-3,12-diazatetradecanedioic acid (H(4)egta): [M'(H2O)(n)] [M(egta)(H2O)](2).n H2O (M': Ca, Sr; M: La, Ce, Pr, Dy, Ho, Er) have been prepared and characterized by using their infrared absorption and Raman spectra, magnetic susceptibility and thermal analyses. The results of Raman spectra (600-200 cm(-1)) suggest that these complexes are of two types: the first includes La, Ce, and Pr complexes, and the second Dy, Ho and Er complexes. The crystal and molecular structures of [Ca(H2O)(2)] [La(egta)(H2O)](2).8H(2)O (1), [Ca(H2O)(2)] [Ce(egta)(H2O)](2).6H(2)O (2), [Sr(H2O)(3)] [Dy(egta)(H2O)](2).7H(2)O (3), and [Sr(H2O)(3)] [Ho(egta)(H2O)](2).7H(2)O (4) have been determined by a single-crystal X-ray diffraction method. The crystals of complexes (1) and (2) are iso-morphous to each other: monoclinic, space group P2(1)/c, Z = 2. The central lanthanide metal atom is 10-coordinated, in a distorted bicapped square antiprism geometry, to two nitrogen and six oxygen atoms of egta(4-), a water molecule, and a carboxyl oxygen atom from an adjacent complex ion. The Ca2+ is at the center of the octahedral geometry and ligated by four carboxyl oxygen atoms and two water molecules. Complexes (3) and (4) are iso-morphous to each other: monoclinic, space group P2(1)/n, Z = 4. The central lanthanide metal atom is nine-coordinated, in a distorted tricapped-trigonal prism geometry, to two nitrogen and six oxygen atoms of egta4-, and to a water molecule which bridges to the Sr2+ ion. Two carboxyl groups of [M(egta)(H2O)](-) (M: Dy, Ho) complex ion bridge to the single Sr2+ ion. In addition, the Sr2+ is coordinated by three non-bridged water molecules, and then the Sr2+ is coordinated by nine atoms. A relationship has been found between the average M-N, M-O(ether) and M-O(carboxylate) bond lengths and Shannon's metal crystal radii for a series of complexes shown as [M'(H2O)(n)][M(egta)(H2O)](2).nH(2)O (M': Ca, Sr; M: La, Ce, Nd, Dy, Ho, Er). (C) 2003 Elsevier B.V. All nights reserved..

    DOI: 10.1016/S0022-2860(03)00420-4

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  • Synthesis and spectroelectrochemical characterization of a novel oxalate-bridged binuclear ruthenium(III) complex

    T Fujino, Y Hoshino, M Eto, Y Yukawa, J Fiedler, W Kaim

    CHEMISTRY LETTERS32 ( 3 ) 274 - 275   2003年3月

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    記述言語:英語   出版者・発行元:CHEMICAL SOC JAPAN  

    A novel oxalate-bridged binuclear ruthenium(III) complex, [{Ru(acac)(2)}(2)(mu-ox)] (acac(-) = acetylacetonate and ox(2-) = oxalate), has been prepared via self-dimerization of K[Ru(acac)2(OX)l in aqueous solutions containing ferric salts as catalyst. The Ru-2 III,II mixed-valence species generated electrochemically with K-c = 10(5.0) for the comproportionation constant exhibits a weak intervalence charge transfer (IVCT) band at 1430 nm. The IR spectra from spectroelectrochemistry indicate a partially localized mixed-valence state (Class II-III behavior).

    DOI: 10.1246/cl.2003.274

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  • Synthesis and Spectroelectrochemical Characterzation of a Novel Oxalate-Bridged Binuclear Ruthenium (Ⅲ) Complex

    Chemistry Letters32 ( 3 ) 274 - 275   2003年3月

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  • Synthesis, structure, and preliminary magnetic studies of a cluster polymer with a hexacopper(II) barrel portion

    LY Wang, S Igarashi, Y Yukawa, T Hashimoto, K Shimizu, Y Hoshino, A Harrison, G Aromi, REP Winpenny

    CHEMISTRY LETTERS32 ( 2 ) 202 - 203   2003年2月

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    記述言語:英語   出版者・発行元:CHEMICAL SOC JAPAN  

    The synthesis and characterization of a new cluster polymer with a sodium centered hexacopper(II) barrel portion, catena-[Nasubset ofCU(2){Cu(hpro)(2)}(4)(ClO4)(4)](ClO4).4H(2)O (hpro = 4-hydroxyL-prolinato) are described. The central sodium ion in the barrel portion is surrounded by eight carboxylate oxygen atoms from hpro ligands, which link the central metal to the copper atoms of four [Cu(hpro)(2)] units. These units are in turn connected to two further apical Cu-II centers. The central alkali ion is therefore octahedrally surrounded by six copper atoms. The hydroxyl oxygen atoms of two hpro groups are coordinated to the axial copper atoms of two neighboring barrel portions, so that a chain complex forms. Magnetic studies indicate weak ferromagnetic coupling between copper(II) ions within the complex leading to a high spin multiplicity in the ground state.

    DOI: 10.1246/cl.2003.202

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  • Synthesis, Structure, and Preliminary Magnetic Studies of Cluster Polymer with a Hexacopper(Ⅱ) Barrel Portion

    Chemistry Letters32 ( 2 ) 202 - 203   2003年2月

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  • Synthesis, structure, and preliminary magnetic studies of unprecedented hexacopper(II) barrel clusters with spin ground state S=3

    LY Wang, S Igarashi, Y Yukawa, Y Hoshino, O Roubeau, G Aromi, REP Winpenny

    DALTON TRANSACTIONS2318-2324 ( 11 ) 2318 - 2324   2003年

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    記述言語:英語   出版者・発行元:ROYAL SOC CHEMISTRY  

    The structure of a discrete hexacopper(II) barrel cluster and that of a coordination polymer formed by a related hexanuclear repeating unit have been determined. The Cu-II metals of the hexanuclear units are held together by eight chelating L-prolinato type ligands, which in turn provide the eight oxygen donors trapping a sodium ion in the center. The structure of the [Cu6Na] unit in the discrete system and in the infinite cluster-chain are essentially the same and both display intra-unit ferromagnetic superexchange. A preliminary magnetic study shows that, for both compounds, the copper centers within the [Cu-6] unit are ferromagnetically coupled, yielding an S = 3 spin ground state.

    DOI: 10.1039/b212494g

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  • Synthesis, structure, and preliminary magnetic studies of unprecedented hexacopper(II) barrel clusters with spin ground state S=3

    LY Wang, S Igarashi, Y Yukawa, Y Hoshino, O Roubeau, G Aromi, REP Winpenny

    DALTON TRANSACTIONS2318-2324 ( 11 ) 2318 - 2324   2003年

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    記述言語:英語   出版者・発行元:ROYAL SOC CHEMISTRY  

    The structure of a discrete hexacopper(II) barrel cluster and that of a coordination polymer formed by a related hexanuclear repeating unit have been determined. The Cu-II metals of the hexanuclear units are held together by eight chelating L-prolinato type ligands, which in turn provide the eight oxygen donors trapping a sodium ion in the center. The structure of the [Cu6Na] unit in the discrete system and in the infinite cluster-chain are essentially the same and both display intra-unit ferromagnetic superexchange. A preliminary magnetic study shows that, for both compounds, the copper centers within the [Cu-6] unit are ferromagnetically coupled, yielding an S = 3 spin ground state.

    DOI: 10.1039/b212494g

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  • The comparison of crystal structures of lanthanide complexes with 3,12-bis(carboxymethyl)-6,9-dioxa-3,12-diazatetradecanedioic acid (H4egta)

    Journal of Molecular Structure659, 23-34   2003年

  • Phase transition and glass transition concerning configurational order/disorder of ions in crystalline (TMA)2[Sr{Ni(pro)2}6](ClO4) 4 and (TMA) [Sm{Ni(pro)2}6](ClO4)4

    Y. Yukawa, S. Igarashi, Y. Masuda, M. Oguni

    Journal of Molecular Structure605 ( 2-3 ) 277 - 290   2002年3月

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    記述言語:英語  

    Crystalline (TMA)2[Sr{Ni(pro)2}6](ClO4) 4 was synthesized newly and its structure was determined, where TMA and pro denote tetramethylammonium and L-prolinato, respectively. Heat capacities of crystalline (TMA)2[Sr[Ni(pro)2}6](ClO4) 4 and (TMA)[Sm{Ni(pro)2}6](ClO4)4 were measured at low temperatures by using an adiabatic calorimeter. In the former compound, a phase transition of the first order was found to occur at (160 ± 1) K with a sharp heat-capacity peak. The enthalpy and entropy of the transition were estimated to be (11.0 ± 0.2) and (69.4 ± 1.5) JK-1 mol-1, respectively. In the latter compound, a phase transition of the first order and a glass transition were found at (190 ± 1) and (162 ± 2) K, respectively. The entropy of the phase transition was estimated to be in the range 20-45 JK-1 mol-1. The phase transitions were attributed to the orientational order/disorder process of perchlorate ions ClO-4, and it was suggested that each ClO-4 ion has six and three distinguishable, reasonably stable orientations in the high-temperature disordered phase for the SrII and SmIII complex compounds, respectively. The glass transition was interpreted as a freezing-in phenomenon of the reorientational motion of ClO-4 ions, and the activation energy for the motion was estimated to be (53 ± 1) kJ mol-1 and less than 39 kJ mol-1 for the SmIII and SrII complex compounds, respectively
    the removal of one of the two TMA ions neighboring to the ClO-4 ion leads to an increase in the activation energy. It is discussed that the cooperative interaction between the orientations of the ClO-4 ions operates through the orientational and positional shifts of TMA ions, and thus the lattice deformation in the relevant region, associated with the orientational change of the ClO-4 ions. Then it is noted that the position of the ClO-4 ion itself would shift to form preferable ionic interaction, for example through a kind of hydrogen bond of C-Hδ+···δ-O-Cl, for each permissible orientation. The shift in total results in a large thermal parameter of the chlorine atom in the disordered phase. © 2002 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0022-2860(01)00782-7

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  • Phase Transition and Glass Transition Conecrning Configurational Order/Disorder of Ions on Crystallin (TMA)<sub>2</sub>[Sr{Ni(pro)<sub>2</sub>}<sub>6</sub>](ClO<sub>4</sub>)<sub>4</sub> and (TMA)[Sm{Ni(pro)<sub>2</sub>}<sub>6</sub>](ClO<sub>4</sub>)<su・・・

    YUKAWA Y, IGARASHI S, MASUDA Y, OGUNI M

    Journal of Molecular Structure605 ( 2/3 ) 277 - 290   2002年

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    Phase Transition and Glass Transition Conecrning Configurational Order/Disorder of Ions on Crystallin (TMA)&lt;sub&gt;2&lt;/sub&gt;[Sr{Ni(pro)&lt;sub&gt;2&lt;/sub&gt;}&lt;sub&gt;6&lt;/sub&gt;](ClO&lt;sub&gt;4&lt;/sub&gt;)&lt;sub&gt;4&lt;/sub&gt; and (TMA)[Sm{Ni(pro)&lt;sub&gt;2&lt;/sub&gt;}&lt;sub&gt;6&lt;/sub&gt;](ClO&lt;sub&gt;4&lt;/sub&gt;)&lt;sub&gt;4&lt;/sub&gt;

    DOI: 10.1016/S0022-2860(01)00782-7

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  • Studies on the thermal dehydration behavior of Ln[Fe(CN)(6)]center dot nH(2)O (Ln=La-Yb; n=4, 5) by means of controlled-rate thermal analysis and Raman spectrometry

    XY Wang, Y Yukawa, Y Masuda

    JOURNAL OF ALLOYS AND COMPOUNDS316 ( 1-2 ) 107 - 112   2001年3月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE SA  

    The dehydration processes of lanthanide hexacyanoferrates(III) n-hydrates, Ln[Fe(CN)(6)].nH(2)O (Ln=La-Yb; n=4, 5) were followed by means of controlled-rate thermal analysis (CRTA), the Raman spectrometry and powder X-ray diffractometer. The dehydration of the pentahydrates took place through four stages. The first, second, third and fourth stages were confirmed to correspond to the dehydrations of 1, 2, 1 and 1 mol of water molecules, respectively. The first stage corresponds to the dehydration of 1 mol of coordinated water molecules, the second stage corresponds to the dehydration of 2 mol of lattice water molecules, and the third and fourth stages correspond to the dehydration of 1 mol of coordinated water molecules, respectively. The dehydration of the tetrahydrates took place through three stages. The first, second and third stages of tetrahydrates were similar to the second, third and fourth stages of the pentahydrates. The activation energies for these stages were obtained from the CRTG curves. (C) 2001 Elsevier Science B.V. All rights reserved.

    DOI: 10.1016/S0925-8388(00)01264-0

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  • A thermal and structure study on lanthanum hexacyanocobaltate((]G0003[))pentahydrate, La[Co(CN)<sub>6</sub>)]-5H<sub>2</sub>O(共著)

    Journal of Thermal Analysis and Calorimetry60   1033 - 1041   2000年

  • Stabilities of five-coordinate ternary copper((]G0002[))complexes containing 2,2'-dipicolylamine and α-amino acids and X-ray crystal structure of[Cu(dpa)(L-phe)](ClO<sub>4</sub>)(dpa=2,2'-dipicolylamine, L-phe=L-phenylalaninate)(共著)

    Inorganica Chimica Acta303 ( 2 ) 148 - 155   2000年

  • Comparative study on the thermal phase transition of rubidium and cesium formates(共著)

    Thermochimica Acta352/353   61 - 67   2000年

  • Synthesis of stable crystals of a self-assembled centered icosahedral samarium cluster formed by bis(L-prolinato)nickel((]G0002[))ligands(共著)

    Inorganic Chemistry39 ( 12 ) 2509 - 2515   2000年

  • Structure-dependent spectral behavior of five-coordinate ternary copper((]G0002[))complexes containing 2, 2'-dipicolylamine. X-ray crystal structures of[Cu(dpa)(pic)]ClO<sub>4</sub> and[Cu(dpa)(pic)]PF<sub>6</sub>・H<sub>2</sub>O(dpa=2, 2'-dipicolylamin・・・

    Inorganica Chimica Acta310 ( 1 ) 96 - 102   2000年

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    Structure-dependent spectral behavior of five-coordinate ternary copper((]G0002[))complexes containing 2, 2&#039;-dipicolylamine. X-ray crystal structures of[Cu(dpa)(pic)]ClO&lt;sub&gt;4&lt;/sub&gt; and[Cu(dpa)(pic)]PF&lt;sub&gt;6&lt;/sub&gt;・H&lt;sub&gt;2&lt;/sub&gt;O(dpa=2, 2&#039;-dipicolylamine, pic=picolinate)(共著)

    DOI: 10.1016/S0020-1693(00)00272-3

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  • Crystal structure and electrochemical behavior of an unusual nitrosyl-Ru complex obtained by a reaction of Ru-2(Me COO)(4) Cl with 2-pyridinecarboxylic acid

    Y Yukawa, S Igarashi, H Horiike, H Nagao, FS Howell, M Mukaida

    CHEMISTRY LETTERS ( 8 ) 733 - 734   1999年8月

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    記述言語:英語   出版者・発行元:CHEMICAL SOC JAPAN  

    The crystal structure and the electrochemical behavior of a Ru-complex, which was obtained from a reaction of [Ru-2(MeCOO)(4)Cl] with 2-pyridinecarboxylic acid and NO2-, were investigated: the complex consists of nitrosyl, 2-pyridinecarboxylato, and acetato ligands. The cyclic voltammogram showed no redox wave in the region of the potential window, unlike common Ru(NO)-complexes.

    DOI: 10.1246/cl.1999.733

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  • Synthesis of centered icosahedral europium cluster formed by bis(L-prolinato)nickel((]G0002[))ligands and isolation of an electrochemically reduced product of its cluster(共著)

    Chemistry Letters ( 12 ) 1265 - 1266   1999年

  • Reductions of{RuNO}<sup>6</sup>-type nitrosyls. Characteristics of the two-electron reduction species isolated as a complex having a formally negatively charged μ-nitrosyl({RuNO}<sup>8</sup>-{RuNO}<sup>8</sup>)and the one-electron reduction species gen・・・

    Bulltin of the Chemical Society of Japan72 ( 6 ) 1273 - 1284   1999年

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    Reductions of{RuNO}&lt;sup&gt;6&lt;/sup&gt;-type nitrosyls. Characteristics of the two-electron reduction species isolated as a complex having a formally negatively charged μ-nitrosyl({RuNO}&lt;sup&gt;8&lt;/sup&gt;-{RuNO}&lt;sup&gt;8&lt;/sup&gt;)and the one-electron reduction species generated electrochemically({RuNO}&lt;sup&gt;7&lt;/sup&gt;)(共著)

    DOI: 10.1246/bcsj.72.1273

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  • Study on the boundary structures in a series of lanthanide hexacyanoferrate((]G0003[))n-hydrates(共著)

    Journal of Alloys and Compounds290 ( 1/2 ) 85 - 90   1999年

  • Structural study on the phase transition of rubidium formate(共著)

    Thermochimica Acta318 ( 1/2 ) 39 - 43   1998年

  • Studies on the interaction between lanthanide ions and ligands in solid complexes of lanthanide hexacyanometalates. PartIII. Synthesis and thermal properties of a series of lanthanide hexacyanometalate(III)n-methanols(共著)

    Journal of Alloys and Compounds266 ( 1/2 ) 123 - 128   1998年

  • Structure of the centred icosahedral samarium cluster formed by bis(L-prolinato)nickel(II) ligands

    Journal of the Chemical Society, Chemical Communications ( 7 ) 711 - 712   1997年

  • Studies on the interaction between lanthanide ions and ligands in solid complexes of lanthanide hexacyanometalates. PartII. The kinetics of thermal dehydration of lanthanide hexacyanocobaltate(III) hydrates, Ln[Co(CN<sub>6</sub>]・nH<sub>2</sub>O and yt・・・

    Journal of Alloys and Compounds260 ( 1/2 ) 70 - 74   1997年

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    Studies on the interaction between lanthanide ions and ligands in solid complexes of lanthanide hexacyanometalates. PartII. The kinetics of thermal dehydration of lanthanide hexacyanocobaltate(III) hydrates, Ln[Co(CN&lt;sub&gt;6&lt;/sub&gt;]・nH&lt;sub&gt;2&lt;/sub&gt;O and yttrium hexacyanocobaltate(III) terahydrate

    DOI: 10.1016/S0925-8388(97)00145-X

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  • Boundary structures in a series of lanthanoid hexacyanocobaltate(III) n-hydrates and their Raman spectra

    Y Yukawa, S Igarashi, T Kawaura, H Miyamoto

    INORGANIC CHEMISTRY35 ( 25 ) 7399 - 7403   1996年12月

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    記述言語:英語   出版者・発行元:AMER CHEMICAL SOC  

    Studies on Ln[Co(CN)(6)]. nH(2)O (Ln = lanthanoid ions; n = 5, 4) by means of thermal analysis, Raman spectroscopy, and X-ray crystallography were carried out, in order to establish the boundary structures in the series. From the thermal analyses, it was confirmed that the complexes include Ln'[Co(CN)(6)]. 5H(2)O (Ln' = La to Nd) or Ln ''-[Co(CN)(6)]. 4H(2)O (Ln = Sm to Lu). Raman spectra of the complexes suggested a different classification. The complexes having five H2O molecules displayed two single bands associated with v(C-N) at around 2170 cm(-1). The complexes having four H2O molecules showed two distinct sets of bands of v(C-N): one was a singlet, and the other was split. Nevertheless, the complex with Nd, which has five H2O molecules, exhibited single and split bands. This implies that the symmetry around Nd is lower than that of other complexes having five H2O molecules. According to the X-ray crystal analysis, the Pr complex is Pr[Co(CN)(6)]. 5H(2)O, hexagonal, P6(3)/m, with a = 7.473-(1) Angstrom, c = 14.212(1) Angstrom, and Z = 2. On the other hand, the Nd complex is Nd[Co(CN)(6)]. 5H(2)O, orthorhombic, C222(1), with a = 7.458(4) Angstrom, b = 12.918(3) Angstrom, c = 14.172(2) Angstrom, and Z = 4. Although the Nd complex has five H2O molecules, the crystals are orthorhombic and belong to the space group C222(1). Therefore, the structure of Nd[Co(CN)(6)]. 5H(2)O is regarded as the boundary structure: one of the coordinated water molecules is disordered, although the structure is essentially the same as that of Pr[Co(CN)(6)]. 5H(2)O. As Pr in Pr[Co(CN)(6)]. 5H(2)O. changes into Nd, the symmetry around the metal atom is lowered and thus the bands associated with v(CN) in Nd[Co(CN)(6)]. 5H(2)O and Sm[Co(CN)(6)]. 4H(2)O outnumber those of Pr[Co(CN)(6)]. 5H(2)O. The 5H(2)O complex with Nd loses one water molecule by thermal dissociation and changes into the more stable 4H(2)O complex, whose crystals are orthorhombic and belong to the space group Cmcm. Pr[Co(CN)(6)]. 5H(2)O also changes into the 4H(2)O complex, orthorhombic and Cmcm, when it dehydrates.

    DOI: 10.1021/ic9602355

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  • Studies on the interaction between lanthanide ions and ligands in sold complexes of lanthanide hexacyanometalates. Part I. The thermal dehydration of lanthanide hexacyanocobaltate(III)hydrates, Ln[Co(CN)<sub>6</sub>]-nH<sub>2</sub>O(Ln=La to Lu ; n=4, ・・・

    Journal of Alloys and Compounds235 ( 1 ) 23 - 29   1996年

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    Studies on the interaction between lanthanide ions and ligands in sold complexes of lanthanide hexacyanometalates. Part I. The thermal dehydration of lanthanide hexacyanocobaltate(III)hydrates, Ln[Co(CN)&lt;sub&gt;6&lt;/sub&gt;]-nH&lt;sub&gt;2&lt;/sub&gt;O(Ln=La to Lu ; n=4, 5),and yttrium hexacyanocobaltate(III)tetrahydrate

    DOI: 10.1016/0925-8388(95)02147-7

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  • Resonance Raman Spectra of Tris(acetylacetonato)-iron(III) and Ruthenium(III) Complexes and Their Solvent Effect(共著)

    Journal of Solution Chemistry24 ( 1 ) 19 - 24   1995年

  • Solvent effects on acetylacetonato iron complexes (共著)

    Inorganica Chimica Acta215,185-190   1994年

  • Formation of acetylacetonato iron complexes in acetonitrile and their resonance Raman spectra

    Minoru Handa, Hiroshi Miyamoto, Toshio Suzuki, Kiyoshi Sawada, Yasuhiko Yukawa

    Inorganica Chimica Acta203 ( 1 ) 61 - 65   1993年1月

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    記述言語:英語  

    Formation of acetylacetonato from complexes in acetonitrile, Fe(acac)2+, Fe(acac)2+ and Fe(acac)3, (the expression represents the solvated species: acac- is the 2, 4-pentanedionate ion), were spectrophotometrically studied. On addition of Hacac to an acetonitrile solution of Fe(ClO4)3, Fe(acac)2+ was quantitatively formed. When excess Hacac was added, only Fe(acac)2+ was obtained without forming Fe(acac)3. On the other hand, Fe(acac)2+ was quantitatively obtained by adding HClO4 to an acetonitrile solution of Fe(acac)3, and Fe(acac)2+ was also formed by adding an excess of HClO4. All the species of acetylacetonato complexes: Fe(acac)2+, Fe(acac)2+ and Fe(acac)3 were formed in the system of Fe(ClO4)3 with an addition of tetraethylammonium acetylacetonate. The resonance Raman spectra of the obtained solutions of Fe(acac)2+ and Fe(acac)2+ and of the solution of Fe(acac)3 were measured. The peaks mainly associated with v(FeO) and v(CO) are observed near 450 and 1600 cm-1, respectively. The order of v(FeO) is Fe(acac)2+ (474 cm-1) &gt
    Fe(acac)2+ (462 cm-1) &gt
    Fe(acac)3 (451 cm-1) and that of v(CO) is Fe(acac)2+ (1554 cm-1) &lt
    Fe(acac)2+ (1578 cm-1) &lt
    Fe(acac)3 (1603 cm-1). These results indicate that the coordination strength of acac- to Fe becomes weaker, because the Lewis acidity of the metal decreases as the number of coordinated acac- increases. © 1993.

    DOI: 10.1016/S0020-1693(00)82905-9

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  • Structures and properties of (L-prolinato)copper(II) complexes prepared from different solvents

    Journal of the Chemical Society, Dalton Transactions3217-3221   1992年

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  • Preparation, characterization and electrochemical properties of mixed-ligand rutheinum(III)and ruthenium(II)complexes with two kinds ofβ-diketones

    Inorganica Chimica Acta174   1990年

  • Structure and properties of chloro(N, N-diethylglycinato)-copper(II)

    Bulletin of the Chemical Society of Japan62   1989年

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  • Synthesis, properties, and crystal and molecular structure of chloro[N, N, bis(2-hydroxyethyl)glycinato]copper(II)

    Bulletin of the Chemical Society of Japan61   1988年

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  • Structure of aquachloro(4-hydroxy-L-prolinato)copper(II)

    Bulletin of the Chemical Society of Japan60   1987年

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  • Synthesis, isolation, and characterization of new mixedligand ruthenium(III) complexes with two kinds of β-diketones

    Chemistry Letters   1987年

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  • Reactivity toward alcohols of (Ru<sup>IV</sup>=0<sup>2-</sup>)unit it trans[RuCl(O)(py)<sub>4</sub>]<sup>+</sup>

    Chemistry Letters   1986年

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  • The structure of dichlorobis(L-proline)zinc(II)

    Bulletin of the Chemical Society of Japan58   1985年

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  • Preparation and structure of the ruthenyl complex, trans{RuCl(O)(py)<sub>4</sub>]<sup>+</sup>

    Chemistry Letters   1985年

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  • Structure and properties of dichloro(L-proline)cadmium(II)hydrate

    Bulletin of the Chemical Society of Japan56   1983年

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  • The structure of dichloro(4-hydroxy-L-proline)cadmium(II)

    Bulletin of the Chemical Society of Japan5   1982年

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Works(作品等)

  • 海洋深層水に含まれるミネラル成分の有効活用についての調査研究

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  • Reseach on effective use of the mineral elements contained in deep sea water

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共同研究・競争的資金等の研究

  • Sytheses, Structures, and Properties of Complexes having an Amino Acid as a Bridging Ligand

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  • 海洋深層水に含まれるミネラル成分の有効活用についての調査研究

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  • ランタニドを含む異核多核錯体の合成,, 構造及び性質

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  • アミノ酸を架橋配位子とする金属錯体の合成,構造及び性質

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  • Syntheses,Structures, and Properties of Heteronclear and/or polynuclear Complexes including Lanthanides

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