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New interpretation of the CH stretching vibrations in imidazolium-based ionic liquids

Patrik Johansson (Institutionen för teknisk fysik, Kondenserade materiens fysik)
Journal of Physical Chemistry A (1089-5639). Vol. 113 (2009), 23, p. 6419-6421.
[Artikel, refereegranskad vetenskaplig]

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.

Denna post skapades 2010-01-08. Senast ändrad 2014-12-09.
CPL Pubid: 105877


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