Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 114, Issue 22, Pages 7587-7592Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp102087m
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Funding
- CNRS (Chemistry Department)
- Region Aquitaine
- Conseil Regional d'Aquitaine
- French Ministry of Research and Technology
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The optical constants of some imidazolium-based ionic liquids (ILs) are determined in the mid- and far-infrared regions by combining polarized attenuated total reflection (ATR) and transmittance spectra. The internal vibrations of the cations and anions and the interionic vibrations can thus be quantitatively evaluated. A comparison of the far-IR spectral response of several imidazolium derivatives associated with the (CF3SO2)(2)N- anion shows that methylation of the more acidic C(2)H imidazolium group does not change the far-IR intensity and hence that the CH center dot center dot center dot anion hydrogen bonds play a negligible role compared with electrostatic interactions. The calculated spectra of ion-pair dimers reproduce the far-IR density of states better than those of simple ion pairs.
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