標題: | Effects of water and methanol on the molecular organization of 1-butyl-3-methylimidazolium tetrafluoroborate as functions of pressure and concentration |
作者: | Chang, Hai-Chou Jiang, Jyh-Chiang Liou, You-Chang Hung, Chao-Hsin Lai, Ting-Yun Lin, Sheng Hsien 應用化學系 Department of Applied Chemistry |
公開日期: | 28-七月-2008 |
摘要: | The structural organization in mixtures of 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF(4)])/water or methanol was studied by infrared spectroscopy. No drastic change in the concentration dependence of the alkyl C-H band frequency was observed at high concentration of the ionic liquid. This behavior indicates a clustering of the ionic liquid in alkyl regions. Nevertheless, the presence of methanol significantly perturbs the ionic liquid-ionic liquid associations in the imidazolium region. On the basis of the responses to change in pressure and concentration, two different types of O-H species, i.e., free O-H and bonded O-H, were observed in the O-H stretching region. For [bmim][BF(4)]/water mixtures, the compression leads to loss of the free O-H band intensity. It is likely that free O-H is switched to bonded O-H as high pressures are applied. For [bmim][BF(4)]/methanol mixtures, the free O-H is still stable under high pressures. (C) 2008 American Institute of Physics. |
URI: | http://dx.doi.org/10.1063/1.2958256 http://hdl.handle.net/11536/8554 |
ISSN: | 0021-9606 |
DOI: | 10.1063/1.2958256 |
期刊: | JOURNAL OF CHEMICAL PHYSICS |
Volume: | 129 |
Issue: | 4 |
結束頁: | |
顯示於類別: | 期刊論文 |