Electrode kinetics of the redox couples of Co(III/II) complexes with ethylenediamine-N-acetate, iminodiacetate, and diethylenetriamine.
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概要
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The electrochemical kinetic parameters of Co(edma)<SUB>2</SUB><SUP>1+⁄0</SUP> (edma: ethylenediamine-<I>N</I>-acetate), Co(ida)<SUB>2</SUB><SUP>1−⁄2−</SUP> iminodiacetate), Co(dien)<SUB>2</SUB><SUP>3+⁄2+</SUP> (dien: diethylenetriamine), Co(1,2-pn)<SUB>3</SUB><SUP>3+⁄2+</SUP> (1,2-pn: 1,2-propanediamine), and Co(gly)<SUB>3</SUB><SUP>0⁄1−</SUP> (gly: glycinate) redox couples were determined by d.c. and normal pulse polarographic measurements as well as galvanostatic double pulse measurements. A difference in the evaluated kinetic parameters for the geometric isomers, <I>trans</I>(<I>O</I>)- and <I>cis</I>(<I>O</I>)-Co(edma)<SUB>2</SUB><SUP>1+⁄0</SUP> and <I>trans</I>(<I>N</I>)- and <I>cis</I>(<I>N</I>)-Co(ida)<SUB>2</SUB><SUP>1−⁄2−</SUP> couples, was recognized. The values of the standard rate constant for the bis forms with dien, edma, and ida were reduced with increase in the number of replacement of amino groups in dien by carboxyl groups. The standard rate constants of the redox couples of Co(III/II) complexes with a series of bi- and tridentate polyamines and aminocarboxylates increase in proportion to the number of nitrogen donor atoms involved in the ligands.
- 公益社団法人 日本化学会の論文
著者
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Oyama Noboru
Department Of Applied Chemistry Faculty Of Technology Tokyo University Of Agriculture And Technology
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Ohsaka Takeo
Department Of Applied Chemistry Faculty Of Technology Tokyo University Of Agriculture And Technology
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Yamaguchi Shuichiro
Department Of Applied Chemistry Graduate School Of Science And Technology Tokyo University Of Agricu
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Matsuda Hiroaki
Department of Biology, Kyushu University
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