Abstract
Abstract Complexation of copper(II) with chloride ions has been calorimetrically and spectrophotometrically studied in various acetonitrile (AN)–dimethyl sulfoxide (DMSO) mixtures at 25 °C. Complexation of copper(II) ion with DMSO as a ligand in AN has also been investigated calorimetrically. It is indicated that the solvent effect on the thermodynamic parameters of the complexation is dominated by two factors, (1) the preferential solvation of copper(II) ion with DMSO that mainly affects the enthalpies, and (2) the change in solvent–solvent interactions in the bulk that strongly affects the corresponding entropies.
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