Intermolecular Forces in an Ionic Liquid ([Mmim][Cl]) versus Those in a Typical Salt (NaCl)


  • This work was supported by the DFG, in particular by the ERA Chemistry Program (KI-768/4-1) and by the SSP-1191 Program (KI-768/5-1). Computer time from the RZ Leipzig and NIC Jülich are gratefully acknowledged. We would furthermore like to thank the following individuals for helpful suggestions and discussions: K. Binnemans, S. D. Peyerimhoff, M. Reiher, A. Taubert, and T. Welton. [Mmim][Cl]=1,3-dimethylimidazolium chloride.


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A subtle difference: In ionic liquids the “weak” dispersion forces have a significant impact on the shape of the potential energy surface, which results in a shallow profile when all of the contributions are considered. Such findings are commonly accepted to determine the liquid state.