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

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

1,* , 1, 1, 1, 2 and 3
Received: 7 September 2006; in revised form: 29 September 2006 / Accepted: 16 October 2006 / Published: 25 October 2006
(This article belongs to the Special Issue Ionic Liquids)
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Abstract: 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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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.

AMA Style

Chang H-C, Chang C-Y, Su J-C, Chu W-C, Jiang J-C, Lin SH. Conformations of 1-Butyl-3-methylimidazolium Chloride Probed by High Pressure Raman Spectroscopy. International Journal of Molecular Sciences. 2006; 7(10):417-424.

Chicago/Turabian Style

Chang, Hai-Chou; Chang, Chao-Yen; Su, Jong-Chang; Chu, Wen-Chi; Jiang, Jyh-Chiang; Lin, Sheng Hsien. 2006. "Conformations of 1-Butyl-3-methylimidazolium Chloride Probed by High Pressure Raman Spectroscopy." Int. J. Mol. Sci. 7, no. 10: 417-424.



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