The Cation–Anion Interaction in Ionic Liquids Probed by Far‐Infrared Spectroscopy

Abstract

Bending and stretching: The nature of intermolecular interactions in imidazolium-based ionic liquids has been studied by far-infrared spectroscopy. The lowest frequencies can be assigned to the bending and stretching vibrational modes of the cation–anion interaction, which describes the cohesion energy.