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Int. J. Mol. Sci. 2006, 7(10), 417-424; doi:10.3390/i7100417

Conformations of 1-Butyl-3-methylimidazolium Chloride Probed by High Pressure Raman Spectroscopy

1,* , 1, 1, 1, 2 and 3
1 Department of Chemistry, National Dong Hwa University, Shoufeng, Hualien 974, Taiwan 2 Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan 3 Institute of Atomic and Molecular Sciences, Academia Sinica, P. O. Box 23-166, Taipei 106, Taiwan 4 Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
* Author to whom correspondence should be addressed.
Received: 7 September 2006 / Revised: 29 September 2006 / Accepted: 16 October 2006 / Published: 25 October 2006
(This article belongs to the Special Issue Ionic Liquids)
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The behavior of 1-butyl-3-methylimidazolium chloride has been investigated byRaman spectroscopy as a function of hydrostatic pressure. Under ambient pressure tworotational isomers (GA and AA forms) of the 1-butyl-3-methylimidazolium cation coexist inthe ionic liquid state. As the supercooled liquid was compressed from ambient to 0.9 GPa,the contribution of the GA conformer decreases in intensity as the pressure was elevated. Anew high pressure phase is formed above the pressure of 1.5 GPa. This new high pressurephase of 1-butyl-3-methylimidazolium chloride arises from perturbed GA conformer, i.e.,distorted Crystal 2. Crystal 1 form (AA form) is known as a thermodynamically stable formunder ambient pressure. Nevertheless, crystal 1 form is switched to a metastable state underthe condition of high pressure.
Keywords: Raman spectroscopy; High pressure; 1-Butyl-3-methylimidazolium chloride. Raman spectroscopy; High pressure; 1-Butyl-3-methylimidazolium chloride.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Chang, H.-C.; Chang, C.-Y.; Su, J.-C.; Chu, W.-C.; Jiang, J.-C.; Lin, S.H. Conformations of 1-Butyl-3-methylimidazolium Chloride Probed by High Pressure Raman Spectroscopy. Int. J. Mol. Sci. 2006, 7, 417-424.

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