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Conformations of 1-Butyl-3-methylimidazolium Chloride Probed by High Pressure Raman Spectroscopy
Department of Chemistry, National Dong Hwa University, Shoufeng, Hualien 974, Taiwan
Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan
Institute of Atomic and Molecular Sciences, Academia Sinica, P. O. Box 23-166, Taipei 106, Taiwan
Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
* Author to whom correspondence should be addressed.
Received: 7 September 2006; in revised form: 29 September 2006 / Accepted: 16 October 2006 / Published: 25 October 2006
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.
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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.
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.
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.