Imidazolium-based ionic liquids: quantitative aspects in the far-infrared region.
J Phys Chem B
; 114(22): 7587-92, 2010 Jun 10.
Article
em En
| MEDLINE
| ID: mdl-20469889
ABSTRACT
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 (CF(3)SO(2))(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...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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Bases de dados:
MEDLINE
Idioma:
En
Revista:
J Phys Chem B
Assunto da revista:
QUIMICA
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
França