Electrode Processes Followed by Chemical Reactions Involving Electroactive Species. II. A Study on the Substitution Reaction Involving Chromium(II)

Abstract

Abstract The one-electron reduction wave of hexamminechromiuni(III) ions at the dropping mercury electrode splits into two steps by the presence of manganese (II) and ethylenediaminetetraacetato-manganate(II) (MnY2−; Y4− represents a quadrivalent ethylenediaminetetraacetate anion) ions. The limiting current of the first step was considered to depend on the rate of the formation of CrY2− by the substitution reaction of MnY2− and chromium(II) ions which were produced at the electrode by the reduction of the chromium(III) complex ions. From the change in the limiting current of the first step by the change of the concentrations of Mn2+, MnY2− and H+ the rate constants of the complex-forming reaction (Remark: Graphics omitted.) were obtained to be K1f=8×107 l.mol−1sec−1,K1b=4×104 l.mol−1sec−1 (ionicstrength 1.0, 25°C)

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Identifiers

DOI

10.1246/bcsj.39.2672

Journal

Bulletin of the Chemical Society of Japan

Year

1966