Abstract
Abstract The preferential solvation of some substituted copper(II) benzoates vizp-CH3, p-NO2 and o-OH copper(II) benzoates was investigated in water-DMSO mixtures at 30°C by Gibbs transfer energy and solvent transport number measurements. While the standard Gibbs energy of transfer of copper(II) ion is negative and decreases with the addition of DMSO, the transfer energies of the anions are positive and increase under the same conditions. The solvent transport number, ΔDMSO, for all salts is positive and passes through a maximum with Δmax = ranging from about 1.5 to 2.0 around X DMSO = 0.35. These results were interpreted in terms of the selective solvation of copper(II) ion with DMSO and the anions by water.
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