Structural and conformational properties of 1-decyl-3-methylimidazolium tetrafluoroborate under high pressure

被引：5

作者：

Chen, Liucheng ^{[1
]}

Li, Haining ^{[1
,2
]}

Zhu, Xiang ^{[1
]}

Su, Lei ^{[1
,3
]}

Yang, Kun ^{[1
]}

Yuan, Chaosheng ^{[1
]}

Yang, Guoqiang ^{[3
]}

Li, Xiaodong ^{[4
]}

机构：

[1] Zhengzhou Univ Light Ind, Ctr High Pressure Sci & Technol Res, Zhengzhou 450002, Peoples R China

[2] Wuhan Univ Technol, Sch Sci, Wuhan 430070, Hubei, Peoples R China

[3] Chinese Acad Sci, Inst Chem, Key Lab Photochem, Beijing 100080, Peoples R China

[4] Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Facil, Beijing 100039, Peoples R China

来源：

JOURNAL OF MOLECULAR STRUCTURE | 2017年 / 1137卷

基金：

美国国家科学基金会;

关键词：

Ionic liquid; Phase transition; High pressure; Raman spectra; X-ray diffraction; TEMPERATURE IONIC LIQUID; ROOM-TEMPERATURE; PHASE-TRANSITIONS; 1-BUTYL-3-METHYLIMIDAZOLIUM HEXAFLUOROPHOSPHATE; 1-ETHYL-3-METHYLIMIDAZOLIUM; STATE; POLYMORPHISM; DISORDER; GPA;

D O I：

10.1016/j.molstruc.2017.02.072

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：610 / 614

页数：5

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