Abstract
We have measured Raman spectral changes in one of the aliphatic series of ionic liquids, N,N,diethyl-N-methyl-N-(2-methoxyethyl) ammonium tetrafluoroborate, [DEME][BF4], under high pressure. Although the [DEME] cation has mainly two stable conformers of TG +−tg + t and TG +−g + g − t in the liquid state, the population of the minor conformer, i.e. TG +−g + g − t, decreases with increasing pressure. The difference in the partial molar volume between the two conformers was determined from the pressure dependence of the relative Raman intensity ratio.
Acknowledgments
We appreciate Professor T. Arai and Dr M. Aono for their helpful discussions.