Ion-pair effect on the rate of the base hydrolysis of the pentaamminechlorocobalt(III) complex.

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概要

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• The rate of the base hydrolysis of pentaamminechlorocobalt(III) ions was measured in the presence of multivalent anions at a constant ionic strength. The results were analyzed in view of the <I>S</I><SUB>N</SUB>1 C.B. mechanism considering the formation of ion-pairs. The ion-pairing has the effect of suppressing the acid dissociation of the complex or the formation of its conjugate base, which acts as the intermediate of the reaction. This effect out-weighs the adverse effect of the probable acceleration of the rate-determining step of the base hydrolysis. The association constants obtained for [CoCl(NH<SUB>3</SUB>)<SUB>5</SUB>]<SUP>2+</SUP>·SO<SUB>4</SUB><SUP>2−</SUP> and [CoCl(NH<SUB>3</SUB>)<SUB>5</SUB>]<SUP>2+</SUP>·P<SUB>3</SUB>O<SUB>9</SUB><SUP>3−</SUP> were 40±5, and 82±5, respectively (<I>I</I>=0.1, 25°C).

• 公益社団法人 日本化学会の論文

著者

• Iida Masayasu

  Department of Chemistry, Faculty of Science, Nagoya University

関連論文

• Ion-pair effect on the rate of the base hydrolysis of the pentaamminechlorocobalt(III) complex.

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