Equimolar mixtures of divalent transition metal perchlorates as constant ionic media in studies on complex formation in non-aqueous donor solvents. Chloro complex formation in dimethyl sulphoxide

Abstract

Equimolar mixtures of divalent transition metal perchlorates in dimethyl sulphoxide (DMSO) have been used as constant ionic media for studying the formation of complexes of metal cations with weakly coordinating anions. Isopiestic experiments indicate the same solvent activities and accordingly the same activity coefficients of the solutes in such mixtures. In the present study Co(ClO₄)₂ is used as one component of the mixture and optical absorptions due to CoCl₃DMSO^–, which is formed on addition of Et₄NCl, are used to study chloride complexing with several transition metals.