Ionic solvation in water + co-solvent mixtures. Part 7.—Free energies of transfer of single ions from water into water + dimethylsulphoxide mixtures

Abstract

Values of the free energy of transfer of the proton, ΔG_t°(H⁺), from water into water + dimethylsulphoxide have been calculated as described earlier for other co-solvents using spectrophotometric measurements. Values of ΔG_t°(X^–) are then produced from ΔG_t°(HX), and these ΔG_t°(X^–) used to produce values for ΔG_t°(Mⁿ⁺) from the free energies of transfer of salts. In general, ΔG_t° for anions are positive and ΔG_t° for cations are negative; these are compared with values obtained with other co-solvents added to water.