Competitive Solvation of the Imidazolium Cation by Water and Methanol

TL;DR

This study uses molecular dynamics simulations to compare how water and methanol solvate the imidazolium cation, revealing water's superior solvation despite chemical similarities, which informs future ionic liquid applications.

Contribution

It provides the first detailed comparison of water and methanol solvation of imidazolium cations using semiempirical molecular dynamics simulations.

Findings

Water solvates the imidazolium cation more effectively than methanol.

Local structure analyzed via radial distribution functions.

Results support future design of ionic liquid-molecular systems.

Abstract

Imidazolium-based ionic liquids are widely used in conjunction with molecular liquids for various applications. Solvation, miscibility and similar properties are of fundamental importance for successful implementation of theoretical schemes. This work reports competitive solvation of the 1,3-dimethylimidazolium cation by water and methanol. Employing molecular dynamics simulations powered by semiempirical Hamiltonian (electronic structure level of description), the local structure nearly imidazolium cation is described in terms of radial distribution functions. Although water and methanol are chemically similar, water appears systematically more successful in solvating the 1,3-dimethylimidazolium cation. This result fosters construction of future applications of the ternary ion-molecular systems.