Effect of Water and Organic Solvents on the Ionic Dissociation of Ionic Liquids

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• 作者：Wenjing Li ; Zhaofu Zhang ; Buxing Han ; Suqin Hu ; Ye Xie ; Guanying Yang
• 刊名：Journal of Physical Chemistry B
• 出版年：2007
• 出版时间：June 14, 2007
• 年：2007
• 卷：111
• 期：23
• 页码：6452 - 6456
• 全文大小：105K
• 年卷期：v.111,no.23(June 14, 2007)
• ISSN：1520-5207

文摘

The effect of water and several organic solvents on the density, viscosity, and conductivity of ionic liquids(ILs) 1-n-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF₆]), 1-n-butyl-3-methylimidazoliumtetrafluoroborate ([bmim][BF₄]), and 1-n-butyl-3-methylimidazolium trifluoroacetate ([bmim][CF₃CO₂]) wasstudied at 298.15 K in wide composition ranges. The density, viscosity, and conductivity of the three neatILs were also determined at various temperatures. Upon the basis of the molar conductivity of the mixturesand that of the neat ILs of the same viscosity, the degree of dissociation of ILs in the solutions was investigated.It can be deduced that the organic solvents enhance the ionic association of the ILs, the effect depending onthe solvent dielectric constant, while water promotes dissociation significantly due to its high dielectric constantand its ability to form strong hydrogen bonds with the anions of the ILs.