標題: Local Structures of Water in 1-Butyl-3-methylimidazolium Tetrafluoroborate Probed by High-Pressure Infrared Spectroscopy
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: 1-Oct-2008
摘要: We have investigated the aggregation behaviors of water molecules in 1-butyl-3-methylimidazolium tetrafluoroborate/water mixtures using high-pressure methods. Under ambient pressure, the IR spectra indicate that two types of O-H species: free O-H and bonded O-H, existing in ionic liquid/water Mixtures. As samples were compressed, a continuous loss of the free O-H band intensity was observed. This observation may have arisen from changes in the local structures of water molecules, and the geometrical properties of the hydrogen-bond network are likely to be perturbed as the pressure is elevated. A complementary insight of the O-H spectral features is obtained by measuring the concentration-dependent variation in the mid-infrared spectra under high pressure. A sharp O-H stretching band was observed in a diluted mixture corresponding to the high order in an ice VII-Iike structure. Nevertheless, a very broad O-H feature was measured in a concentrated mixture, which may be attributed to the presence of more than one stable cluster.
URI: http://dx.doi.org/10.2116/analsci.24.1305
http://hdl.handle.net/11536/8307
ISSN: 0910-6340
DOI: 10.2116/analsci.24.1305
期刊: ANALYTICAL SCIENCES
Volume: 24
Issue: 10
起始頁: 1305
結束頁: 1309
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