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Copper(ii) ions in aqueous ammonia solution oxidize thiosulphate ions initially t o 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(i1)-thiosulphate complex, gives rise to copper(i) and S,O,-ions, the latter dimerizing to tetrathionate ions.

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