Preparation and isomerization of isomers of the L- or D-aspartato(L-histidinato)cobalt(III) complex.
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概要
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The six isomers of the [Co(L- or D-asp)(L-his)] complex (asp=aspartate ion and his=histidinate ion) have been prepared and the isomerization studied in the absence of any catalyst. The equilibrium mole fractions of these isomers in water has been found for L-<I>transO</I><SUB>5</SUB><I>cisN</I><SUB>5</SUB>, L-<I>cisO</I><SUB>5</SUB><I>transN</I><SUB>5</SUB>, L-<I>fac</I>, to be 0.53, 0.06, and 0.41, respectively, those for D-<I>cisO<SUB>b</SUB>cisN</I><SUB>5</SUB>, D-<I>transO</I><SUB>5</SUB><I>transN</I><SUB>5</SUB>, and D-<I>fac</I> to be 0.48, 0.01, and 0.51 respectively. The indication is that the relative positions of the six coordinated atoms around a cobalt atom cause these unequal isomer concentration ratios. The isomerisms are dealt with by means of a network of first order reversible reactions and the absolute values of the rate constants at 80 °C have been determined.
- 公益社団法人 日本化学会の論文
著者
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Yoshikawa Sadao
Department Of Applied Chemistry Faculty Of Science And Technology Keio University
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Watabe Masatoshi
General Education Department Kogakuin University
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Yano Hisao
General Education Department, Kogakuin University
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