Structural and conformational properties of 1-decyl-3-methylimidazolium tetrafluoroborate under high pressure
Structural and conformational properties of 1-decyl-3-methylimidazolium tetrafluoroborate under high pressure
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高压下1-癸基-3-甲基咪唑鎓四氟硼酸盐的结构和构象性质
DOI：
10.1016/j.molstruc.2017.02.072
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发表时间：
2017-06-05
影响因子：
3.8
通讯作者：
Li, Xiaodong
中科院分区：
文献类型：
--
作者：
Chen, Liucheng;Li, Haining;Li, Xiaodong
用拉曼光谱和同步辐射X射线衍射法研究了1-癸基-3-甲基咪唑四氟硼酸盐([C10MIM][BF4])在常温3.4 Gpa高压下从熔体中的原位结晶。拉曼光谱分析表明，[C10MIM][BF4]在0.3 Gpa和1.6 Gpa附近经历了两次相变。并根据[C10MIM](+)阳离子在Guche构象和反式构象之间的构象异构性对其多态进行了讨论。值得注意的是，同步辐射X射线衍射仪进一步证实了液晶相变和晶体相变。此外，还表明长链阳离子的高结构柔性可能会影响离子液体压力诱导结晶的无序程度。(C)2017爱思唯尔B.V.保留所有权利。
In situ crystalization of 1-decyl-3-methylimidazolium tetrafluoroborate ([C10MIM][BF4]) from melt has been investigated under high pressure up to 3.4 GPa at room temperature by using Raman spectroscopy and synchrotron X-ray diffraction measurement. Raman spectral analysis indicated that [C10MIM][BF4] experienced two successive phase transitions at about 0.3 GPa and 1.6 GPa. And the polymorphism was also discussed in view of the conformational isomerism of [C10MIM](+) cation between gauche and trans conformers. Notably, liquid-crystal and crystal-crystal phase transitions were further confirmed by synchrotron X-ray diffraction measurement. Moreover, it also indicated that high structural flexibility of the cations with long alkyl chain might have effect on the degree of disorder of pressure-induced crystallization for ionic liquids. (C) 2017 Elsevier B.V. All rights reserved.