Ionic liquids based on the bis(trifluoromethylsulfonyl)imide anion for high-pressure Raman spectroscopy measurements
Article first published online: 28 NOV 2012
Copyright © 2012 John Wiley & Sons, Ltd.
Journal of Raman Spectroscopy
Volume 44, Issue 3, pages 481–484, March 2013
How to Cite
Faria, L. F. O., Nobrega, M. M., Temperini, M. L. A. and Ribeiro, M. C. C. (2013), Ionic liquids based on the bis(trifluoromethylsulfonyl)imide anion for high-pressure Raman spectroscopy measurements. J. Raman Spectrosc., 44: 481–484. doi: 10.1002/jrs.4220
- Issue published online: 19 MAR 2013
- Article first published online: 28 NOV 2012
- Manuscript Accepted: 24 OCT 2012
- Manuscript Revised: 23 OCT 2012
- Manuscript Received: 1 SEP 2012
- diamond anvil cell;
- high pressure;
- ionic liquid
Assembling a diamond anvil cell for high-pressure measurements involves placing in a gasket hole the sample of interest, a pressure transmitting fluid, and a material for pressure calibration. In this communication, we propose the use of ionic liquids containing the bis(trifluoromethylsulfonyl)imide anion ([Tf2N]-), [(CF3SO2)2 N]-, as a simultaneous pressure transmitting and calibrant material for high-pressure Raman spectroscopy measurements of solid samples that are not soluble in ionic liquids. The position of the characteristic Raman band of the [Tf2N]- anion at 740 cm−1 exhibits linear frequency shift for pressures up to 2.5 GPa. High-pressure Raman spectra of different ionic liquids containing the same anion indicate that the actual magnitude of the pressure-induced frequency shift of the [Tf2N]- normal mode depends on the counterion, the typical shift being 4.2 cm−1/GPa. Ionic liquids based on the [Tf2N]- anion are also good pressure transmitting mediums because hydrostatic condition is kept at high pressure, and no crystallization is observed up to 4.0 GPa. Copyright © 2012 John Wiley & Sons, Ltd.