Issue 8, 1973

Kinetics and mechanism of the oxidation of thiosulphate ions by copper(II) ions in aqueous ammonia solution

Abstract

Copper(II) ions in aqueous ammonia solution oxidize thiosulphate ions initially to tetrathionate ions; the latter then undergo a subsequent disproportionation reaction to yield trithionate and thiosulphate ions. The detailed kinetics of the reaction suggest a mechanism which involves substitution of thiosulphate ion into the co-ordination sphere of a triamminecopper(II) complex in the rate-determining step. A one-equivalent electron transfer from the thiosulphate to the copper(II) ion, occurring in the intermediate triamminecopper(II)–thiosulphate complex, gives rise to copper(I) and S2O3 ions, the latter dimerizing to tetrathionate ions.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1973, 889-893

Kinetics and mechanism of the oxidation of thiosulphate ions by copper(II) ions in aqueous ammonia solution

J. J. Byerley, S. A. Fouda and G. L. Rempel, J. Chem. Soc., Dalton Trans., 1973, 889 DOI: 10.1039/DT9730000889

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