The effects of anion and cation substitution on the ultrafast solvent dynamics of ionic liquids: A time-resolved optical Kerr-effect spectroscopic study

Gerard Giraud, Charles M. Gordon, Ian R. Dunkin, Klaas Wynne

Research output: Contribution to journalArticle

213 Citations (Scopus)

Abstract

Ultrafast solvent dynamics of room-temperature ionic liquids have been investigated by optical heterodyne-detected Raman-induced Kerr-effect spectroscopy ~OHD-RIKES! by studying the effects of cation and anion substitution on the low frequency librational modes. The spectra of two series of imidazolium salts are presented. The first series is based on the 1-butyl-3-methylimidazolium salts @bmim#1 containing the anions trifluoromethanesulfate @TfO#2, bis~trifluoromethanesulfonyl!imide @Tf2N#2, and hexafluorophosphate @PF6#2. The second series is based on @Tf2N#2 salts containing the three cations 1-butyl-2,3-dimethylimidazolium @bmmim#1, 1-methyl-3-octylimidazolium @omim#1, and @bmim#1. It is found in all five samples that the signal is due to libration of the imidazolium ring at three frequencies around 30, 65, and 100 cm21 corresponding to three local configurations of the anion with respect to the cation.
LanguageEnglish
Pages464-477
Number of pages13
JournalJournal of Chemical Physics
Volume119
Issue number1
DOIs
Publication statusPublished - 1 Jul 2003

Fingerprint

Optical Kerr effect
Ionic Liquids
Kerr effects
Anions
Cations
Substitution reactions
Salts
substitutes
anions
salts
cations
liquids
Imides
libration
imides
Spectroscopy
low frequencies
rings
room temperature
configurations

Keywords

  • anion
  • cation
  • ionic liquids
  • Kerr-effect spectroscopy
  • nanoscience

Cite this

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abstract = "Ultrafast solvent dynamics of room-temperature ionic liquids have been investigated by optical heterodyne-detected Raman-induced Kerr-effect spectroscopy ~OHD-RIKES! by studying the effects of cation and anion substitution on the low frequency librational modes. The spectra of two series of imidazolium salts are presented. The first series is based on the 1-butyl-3-methylimidazolium salts @bmim#1 containing the anions trifluoromethanesulfate @TfO#2, bis~trifluoromethanesulfonyl!imide @Tf2N#2, and hexafluorophosphate @PF6#2. The second series is based on @Tf2N#2 salts containing the three cations 1-butyl-2,3-dimethylimidazolium @bmmim#1, 1-methyl-3-octylimidazolium @omim#1, and @bmim#1. It is found in all five samples that the signal is due to libration of the imidazolium ring at three frequencies around 30, 65, and 100 cm21 corresponding to three local configurations of the anion with respect to the cation.",
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The effects of anion and cation substitution on the ultrafast solvent dynamics of ionic liquids: A time-resolved optical Kerr-effect spectroscopic study. / Giraud, Gerard; Gordon, Charles M.; Dunkin, Ian R.; Wynne, Klaas.

In: Journal of Chemical Physics, Vol. 119, No. 1, 01.07.2003, p. 464-477.

Research output: Contribution to journalArticle

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