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Suzuki T, Tsukuda T, Kiki M, Kaizaki S, Isobe K, Takagi HD, Kashiwabara K. Preparation, crystal structures and spectroscopic properties of novel [MIIICl3−n(P)3+n]n+ (M=Co, Rh; n=0, 1, 2 or 3) series of complexes containing tripodal tridentate phosphine, 1,1,1-tris(dimethylphosphinomethyl)ethane. Inorganica Chim Acta 2005. [DOI: 10.1016/j.ica.2005.02.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Suzuki T, Imamura T, Kaizaki S, Kashiwabara K. Preparation, crystal structures and spectroscopic properties of chloro(pentane-2,4-dionato){1,1,1-tris(dimethylphosphinomethyl)ethane}chromium(III), cobalt(III) and rhodium(III) hexafluorophosphate: comparison of the MP, MCl and MO (M=Cr, Co and Rh) bond lengths among the three MIII complexes. Polyhedron 2002. [DOI: 10.1016/s0277-5387(02)00859-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Iwatsuki S, Obeyama K, Koshino N, Funahashi S, Kashiwabara K, Suzuki T, Takagi HD. New low-spin Co(II) complexes with novel tripodal 1,1,1-tris(dimethylphosphinomethyl)ethane ligand: electron transfer kinetics and spectroscopic characterization of Co(II)P6 and Co(II)P3S3 ions in aqueous solution. CAN J CHEM 2001. [DOI: 10.1139/v01-119] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Substitution-inert Co(II) complexes with tripodal 1,1,1-tris(dimethylphosphinomethyl)ethane were produced in aqueous solution by the controlled-potential electrolysis. EPR studies indicated that the Co(II)P6 and Co(II)P3S3 species are in the low-spin t62ge1g state. The analyses of the absorption spectra of the Co(II) species in solution indicated significant JahnTeller distortion in Co(II)P6 and Co(II)P3S3 ions as expected for the low-spin d7 electronic configuration, while less distortion was observed for the Co(II)S6 ion. Kinetic studies of the redox reactions involving these Co(III/II) species confirmed that the electron self-exchange reactions for the Co(III/II)P6 and Co(III/II)P3S3 couples are relatively fast (kex ~ 1 × 104 dm3 mol1 s1), which is consistent with the results for other low-spin low-spin Co(III/II) couples. It was concluded that the nephelauxetic effect of the P-donor atom stabilizes the low-spin state in Co(II), and that the rather rapid electron exchange rates for these Co(III/II) couples were explained by the lack of the spin reorganization process required for the ordinary low-spin high-spin Co(III/II) couples.Key words: cobalt(III/II), spin state, EPR study, kinetics, electron transfer.
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Suzuki T, Kashiwabara K, Usami T, Imamura T, Kiki M, Fujita J, Kaizaki S. Syntheses, Structures and Spectroscopic Properties of Mixed-Ligand Chromium(III) Complexes Containing 1,2-Bis(dimethylphosphino)ethane, 1,3-Bis(dimethylphosphino)propane or 1,1,1-Tris(dimethylphosphinomethyl)ethane. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2001. [DOI: 10.1246/bcsj.74.1055] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Iwatsuki S, Kato H, Obeyama K, Funahashi S, Koshino N, Kashiwabara K, Suzuki T, Takagi HD. Cobalt(II) phosphine complexes stable in aqueous solution: spectroscopic and kinetic evidence for low-spin Co(II)P6 and Co(II)P3S3 with tripodal 1,1,1-tris(dimethylphosphinomethyl)ethane. INORG CHEM COMMUN 2000. [DOI: 10.1016/s1387-7003(00)00134-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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The synthesis of palladium-gold and platinum-gold bimetallic complexes based upon tripod tridentate phosphine and arsine ligands. Polyhedron 1996. [DOI: 10.1016/0277-5387(95)00382-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Kashiwabara K, Ozeki Y, Kita M, Fujita J, Nakajima K. Synthesis and Crystal Structure of Bis(1,1,1-tris(dimethylphosphinomethyl)ethane)iron(II) Tetrafluoroborate Dihydrate. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1995. [DOI: 10.1246/bcsj.68.3453] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kashiwabara K, Kita M, Masuda H, Kurachi S, Ohba S. Crystal Structures of Cobalt(III)–Methyldiphenylphosphine Complexes. Co(III)–P Bond Lengths and Their Cleavages. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1995. [DOI: 10.1246/bcsj.68.883] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kita M, Kashiwabara K, Fujita J, Tanaka H, Ohba S. Crystal Structures oftrans-[CoCl2{(CH3)2PCH2CH2P(CH3)2}2]ClO4,trans(Cl,Cl)cis(P,P)-[CoCl2{NH2CH2CH2P(CH3)2}2]PF6·0.5CH3OH, andtrans-[CoCl2(NH2CH2CH2NH2)2]NO3. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1994. [DOI: 10.1246/bcsj.67.2457] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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