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


  • This work was supported by the state of Mecklenburg-Vorpommern (Germany), and the Pact for Research and Innovation of the Federal Ministry of Education and Research/Leibniz Science Association.


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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.