Electron-Transfer Reactions of Multidentate Ligand Cobalt(III) Complexes. II. The Effect of Nonbridging Ligands
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概要
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The specific rates for the Fe<SUP>2+</SUP> reductions of <I>cis</I>-Co(en)<SUB>2</SUB>ACl<SUP>2+</SUP> (A=methyl-, ethyl-, propyl-, butyl-, ethanol-, and propanolamine), Co(dien)(en)Cl<SUP>2+</SUP> and Co(tetren)Cl<SUP>2+</SUP> have been determined. The observed rates are relatively insensitive to the <I>cis</I>-ligand of the A. The rate constant for the <I>cis</I>-Co(en)<SUB>2</SUB>ACl<SUP>2+</SUP> decreases with an increase in the size of the A ligand. In such cases as that of the aminoalcohol ligand, the rate is greater than that of the corresponding alkylamine ligand complex. The effect of chelation by nonbridging ligands has been discussed by comparing the relative effectiveness for Fe<SUP>2+</SUP> reductions of CoN<SUB>5</SUB>Cl<SUP>2+</SUP> (N<SUB>5</SUB>=(NH<SUB>3</SUB>)<SUB>5</SUB>, (en)<SUB>2</SUB>NH<SUB>3</SUB>, (dien)(en), and tetren) with that for Cr<SUP>2+</SUP> reductions of some Co(III) complexes.
- 公益社団法人 日本化学会の論文
著者
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Ohashi Kousaburo
Department Of Achemistry Faculty Of Science Ibaraki University
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Kurimura Yoshimi
College of General Education The University of Tokyo
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