Ion Solvation in Water Acetonitrile Mixtures

Published

January 1, 2001

Author(s)

Raymond D. Mountain

Abstract

The results of a preliminary molecular dynamics study of ion (NA+ and Cl-) solvation and association in water, acetonitrile, and aqueous acetonitrile are discussed. These mixtures are compositionally heterogeneous on the scale of a few molecular sizes, and this heterogeneity is expected to be an important factor governing ion solvation and association. Results for ions in pure water and pure acetonitrile are presented for ambient conditions. The degree of association is low in water and high in acetonitrile a low density fluid. A separate set of simulations for water at supercritical temperatures demonstrates that the fluid density is more important than the temperature in determining the degree of ion association. Preliminary results for the mixtures are inconclusive except that they indicate the existence of an important sampling issue related to the compositional heterogeneity of the mixtures. An approach to resolving the sampling issue is suggested.

Citation

International Journal of Thermophysics

Volume

22

Issue

No. 1

Pub Type

Journals

Keywords

acetonitrile, aqueous acetonitrile, ion association, ion solvation, molecular dynamics, water

Citation

Mountain, R. (2001), Ion Solvation in Water Acetonitrile Mixtures, International Journal of Thermophysics (Accessed April 29, 2024)