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

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

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-methylimidazolium tetrafluoroborate ([bmim][BF4]), and 1-n-butyl-3-methylimidazolium trifluoroacetate ([bmi...

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Veröffentlicht in:The journal of physical chemistry. B 2007-06, Vol.111 (23), p.6452-6456
Hauptverfasser: Li, Wenjing, Zhang, Zhaofu, Han, Buxing, Hu, Suqin, Xie, Ye, Yang, Guanying
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container_end_page 6456
container_issue 23
container_start_page 6452
container_title The journal of physical chemistry. B
container_volume 111
creator Li, Wenjing
Zhang, Zhaofu
Han, Buxing
Hu, Suqin
Xie, Ye
Yang, Guanying
description 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-methylimidazolium tetrafluoroborate ([bmim][BF4]), and 1-n-butyl-3-methylimidazolium trifluoroacetate ([bmim][CF3CO2]) was studied at 298.15 K in wide composition ranges. The density, viscosity, and conductivity of the three neat ILs were also determined at various temperatures. Upon the basis of the molar conductivity of the mixtures and 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 on the solvent dielectric constant, while water promotes dissociation significantly due to its high dielectric constant and its ability to form strong hydrogen bonds with the anions of the ILs.
doi_str_mv 10.1021/jp071051m
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