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Abstract
The preferential solvation of copper(II) salts, namely acetate, benzoate and iodate, has been studied in water-pyridine and water-dimethyl sulphoxide (DMSO) mixtures at 30°C by Gibbs energies of transfer and solvent transport number measurements. While the solubility of copper(II) acetate and copper(II) iodate in water-pyridine mixtures increases up to the pyridine mole fraction X py = 0.1, and then decreases, the solubility of copper(II) benzoate increases continuously with the addition of pyridine up to the pure solvent. In the case of water-DMSO mixtures, the solubilities of copper iodate and copper benzoate increase, whereas that of the acetate decreases continuously with the addition of DMSO. The Gibbs energy of transfer of the Cu 2+ ion is negative and decreases continuously with the addition of pyridine or DMSO, while that of the acetate, benzoate and iodate anions is positive and increases continuously in both the solvent mixtures. These results, along with the solvent transport number Δ of pyridine or DMSO, have been interpreted in terms of heteroselective solvation of the salts, with the Cu 2+ ion being preferentially solvated by pyridine or DMSO and the anions by water in water-pyridine and water-DMSO mixtures respectively.
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