PARTIAL MOLAR VOLUMES OF IONS IN NONPOLAR-SOLVENTS

A method of including density effects in electrostatic calculations of ions in nonpolar solvents has been developed which is useful down to a radius of 2 angstrom. It is shown on the basis of free energy calcul ations that the first layer of solvent molecules around a small ion is most likely frozen in a high-density glasslike state. With this effec t included, good agreement (+/- 30 CM3/mol) is found with recent exper imental data on five solvents, in which electrostriction volumes for C O2-range from -180 to -265 cm3/mol. The effect on ionic mobility is di scussed.