Kinetics and mechanisms of the reduction of cobalt(III) complexes by the chromium(II) complex ligating N-(2-hydroxyethyl)ethylenediamine-N,N',N'-triacetate.
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概要
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The reduction of the cobalt(III) complexes, CoX(NH<SUB>3</SUB>)<SUB>5</SUB><SUP>(3–<I>m</I>)+</SUP> (X<SUP><I>m</I>−</SUP>=Cl<SUP>−</SUP>, Br<SUP>−</SUP>, NCS<SUP>−</SUP>, and H<SUB>2</SUB>O) and Co(en)<SUB>3</SUB><SUP>3+</SUP>, by Cr(II)–HEDTRA was studied by the stopped-flow method, where en and HEDTRA denote ethylenediamine and <I>N</I>-(2-hydroxyethyl)ethylenediamine-<I>N</I>,<I>N</I>′,<I>N</I>′-triacetatic acid respectively. From the kinetic behavior and the spectral properties of the immediate chromium(III) products, it is concluded that the Cr(II)–HEDTRA reductions of CoX(NH<SUB>3</SUB>)<SUB>5</SUB><SUP>2+</SUP> (X<SUP>−</SUP>=Cl<SUP>−</SUP>, Br<SUP>−</SUP>, and NCS<SUP>−</SUP>) are of an inner-sphere type. The effect of the HEDTRA coordinated to chromium(II) on the rates of the electron-transfer reactions is discussed.
- 公益社団法人 日本化学会の論文
著者
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Ogino Hiroshi
Department Of Chemistry Faculty Of Science Tohoku University
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Tanaka Nobuyuki
Department Of Botany Kochi Prefectural Makino Botanical Garden
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Shimura Makoto
Department of Chemistry, Faculty of Science, Tohoku University
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