Spectrophotometric and conductometric study of cobalt(II) bromide–dimethyl sulphoxide solutions

Abstract

Visible absorption spectra and the molar conductivities of CoBr₂ dissolved in dimethyl sulphoxide (dmso) have been determined. Absorption spectra of the Co(ClO₄)₂–LiBr–dmso and CoBr₂–chlorobenzene–dmso ternary systems have also been investigated at 25 °C. The results indicate the existence of the [Co(dmso)₆]²⁺, [CoBr(dmso)₆]⁺, and [CoBr₃(dmso)]^– complexes in dmso solutions of CoBr₂ while the [CoBr₄]^2– ion exists in the ternary system at high Br^– to Co²⁺ ratios only.