A complementary Lewis acid-base description of solvent effects. II. Dipole-dipole interactions

Abstract

A previously described empirical model for solvent effects is applied to kinetic, thermodynamic and spectroscopic data selected to reflect variation in solute-solvent interactions of a dipole-dipole character. The three parameter fit was found to describe the solvent effect successfully in 75% of the cases considered. The choice of basicity parameters for protic solvents is discussed, and the basicity scales of Gutmann, Kagiya, Koppel and Palm, and Arnett, are compared. It is concluded that an extension of the present model should take into consideration entropic effects associated with solute-solvent interactions.