Preparation and CD spectra of cobalt(III) complexes with S-(carboxymethyl)-L-cysteinate and its analogues.
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概要
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Four cobalt(III) complexes of the [Co(L-quadridentate-<I>N</I>,<I>S</I>,<I>O</I><SUB>2</SUB>)(en)]<SUP>+</SUP> type were prepared; where L-quadridentate-<I>N</I>,<I>S</I>,<I>O</I><SUB>2</SUB> denotes <I>S</I>-(carboxymethyl)-L-cysteinate(L-cmc), <I>S</I>-(2-carboxyethyl)-L-cysteinate(L-cec), <I>S</I>-(carboxymethyl)-L-homocysteinate(L-cmhc), or <I>S</I>-(2-carboxyethyl)-L-homocysteinate(L-cehc). Each complex was chromatographically separated into the quasi-enantiomeric isomers; <I>Λ</I>L-<I>trans</I>(<I>O</I>)-<I>S</I>(<I>S</I>) and <I>Δ</I>L-<I>cis</I>(<I>O</I>)-<I>R</I>(<I>S</I>) for the L-cmc, L-cmhc, and L-cehc complexes, and <I>Λ</I>L-<I>trans</I>(<I>O</I>)-<I>R</I>(<I>S</I>) and <I>Δ</I>L-<I>cis</I>(<I>O</I>)-<I>S</I>(<I>S</I>) for the L-cec one. These isomers were characterized from their absorption and <SUP>13</SUP>C NMR spectra. The sterically strained <I>Δ</I>L-<I>cis</I>(<I>O</I>) isomers exhibited some significant CD spectral behavior in the first d-d absorption band region. The CD spectra are discussed in relation to the sizes of the S–N and S–O chelate rings joining the chiral sulfur atom in the L-quadridentate-<I>N</I>,<I>S</I>,<I>O</I><SUB>2</SUB> ligand.
- 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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Einaga Hisahiko
Institute of Materials Science, University of Tsukuba
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Suzuki Masutaro
Department of Chemistry, University of Tsukuba
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