Solvent–solute interactions in moderate and high dielectric constant solvents

Abstract

The conductance of potassium perchlorate in the following solvent mixtures, sulpholan + acetonitrile; sulpholan + methanol and acetonitrile + methanol, was measured at 25°C. Analysis of the association and hydrodynamic behaviour of the electrolyte in these systems shows significant differences between solvents. Comparison of these results with previous studies in water + sulpholan and ethylene carbonate + acetonitrile mixtures shows that while the influence of non protic solvents on ion pair association is negligible, hydrogen bonded solvents give ion-solvent interactions of such an extent as to modify the electrostatic short-range interaction between ions.