New interpretation of the CH stretching vibrations in imidazolium-based ionic liquids
Journal article, 2009

In ionic liquids composed of alkyl-substituted imidazolium cations and weakly coordinating anions such as bis(trifluoromethanesulfonyl)imide, (CF 3SO2)2N-, the stretching vibrations of the imidazolium CH groups are shown to interact by Fermi resonance with the overtones and the combination of two in-plane ring vibrations. This new assignment, based on isotopic substitutions and anharmonic frequency calculations for gas phase cations, implies that these imidazolium cations do not establish any strong and directional C-H...anion hydrogen bond.


Patrik Johansson

Chalmers, Applied Physics, Condensed Matter Physics

Journal of Physical Chemistry A

1089-5639 (ISSN) 1520-5215 (eISSN)

Vol. 113 23 6419-6421

Subject Categories

Physical Sciences

Condensed Matter Physics



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