In Situ Crystallization of Ionic Liquid [Emim][PF6] from Methanol Solution under High Pressure

被引：15

作者：

Li, Haining ^{[1
]}

Su, Lei ^{[1
]}

Zhu, Xiang ^{[1
]}

Cheng, Xuerui ^{[1
]}

Yang, Kun ^{[1
]}

Yang, Guoqiang ^{[2
]}

机构：

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

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

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2014年 / 118卷 / 29期

基金：

美国国家科学基金会;

关键词：

RAMAN; SOLUBILITY; 1-ETHYL-3-METHYLIMIDAZOLIUM; HEXAFLUOROPHOSPHATE; COEFFICIENTS; EQUILIBRIUM; CHLORIDE; HYDRATE; SALTS; WATER;

D O I：

10.1021/jp500866z

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：

The solubility of 1-ethyl-3-methylimidazolium hexafluorophosphate ([Emim][PF6]) in methanol under high pressure is newly measured quantitatively according to the correlation between the ratios of Raman intensity and the concentrations. In situ crystallization and cation conformation of [Emim][PF6] from methanol solution under high pressure have been investigated by using Raman spectroscopy in detail. Remarkably, crystal polymorphism was observed and two crystalline phases (phases I and H) coexisted under high pressure up to similar to 1.4 GPa. However, only phase II was obtained by recrystallization at similar to 2 GPa. Our findings may facilitate the development of an effective way for crystallization and purification of ionic liquids under high pressure.

引用

页码：8684 / 8690

页数：7

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