Preparation and characterization of cobalt(III) complexes with L-cysteinate and S-methyl-L-cysteinate. Crystal structure of (L-cysteinato)(diethylenetriamine)cobalt(III) perchlorate.
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概要
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Of three possible isomers for the (L-cysteinato)(diethylenetriamine)cobalt(III) complex, [Co(L-cys)(dien)]<SUP>+</SUP>, two isomers are selectively prepared. Of the two isomers, the crystal structure of the dominantly formed isomer has been determined by the X-ray diffraction method. The greenish brown needle crystal was orthorhombic, space group <I>P</I>2<SUB>1</SUB>2<SUB>1</SUB>2<SUB>1</SUB>, <I>a</I>=16.589(4), <I>b</I>=20.510(9), <I>c</I>=12.479(4) Å, and <I>Z</I>=4. The structure has been refined to <I>R</I>=0.068 on 5913 observed reflections. There are three crystallographically independent complex cations in an asymmetric unit. All the complex cations have trans(N<SUB>i</SUB>S) configuration and the L-cysteinate coordinates facially to the cobalt atoms as terdentate-<I>N</I>,<I>O</I>,<I>S</I> ligand. The isomers of the (<I>S</I>-methyl-L-cysteinato)(diethylenetriamine)cobalt(III) complex were derived from [Co(L-cys)(dien)]<SUP>+</SUP> by the reaction with dimethyl sulfate. The electronic absorption, CD, and <SUP>1</SUP>H and <SUP>13</SUP>C NMR spectral behaviors for these complexes are discussed in relation to their geometrical configurations.
- 公益社団法人 日本化学会の論文
著者
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Einaga Hisahiko
Institute Of Materials Science University Of Tsukuba
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Okamoto Ken-ichi
Department Of Advanced Materials Science & Engineering Faculty Of Engineering Yamaguchi Universi
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Hidaka Jinsai
Department of Chemistry Faculty of Science Osaka University
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Umehara Hideki
Department of Chemistry, University of Tsukuba
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Nomoto Masayo
Department of Chemistry, University of Tsukuba
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