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Keywords:

  • ab initio calculations;
  • cohesion energy;
  • intermolecular forces;
  • ionic liquids;
  • IR spectroscopy
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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.