Aqueous imidazole solutions: A structural perspective from simulations with high-rank electrostatic multipole moments

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Abstract

Imidazole is a small but important molecule occurring as a structure fragment in systems from amino acids, over ionic liquids, to synthetic polymers. Here we focus on the structure and dynamics of imidazole in water at ambient conditions, using both radial and spatial distribution functions. Molecular dynamics simulations were carried out for various imidazole concentrations, using a traditional point-charge potential and a high-rank multipolar potential. The difference in the description of the electrostatics leads to sizable quantitative differences (e.g., the diffusion coefficient) but also qualitative differences in the local structure. In contrast to a point-charge potential, the multipolar potential favors hydrogen-bonded chainlike imidazole dimers over stacked dimers. © 2011 American Chemical Society.

Bibliographical metadata

Original languageEnglish
Pages (from-to)11389-11398
Number of pages9
JournalJournal of Physical Chemistry B
Volume115
Issue number39
DOIs
Publication statusPublished - 6 Oct 2011