Journal
JOURNAL OF SOLUTION CHEMISTRY
Volume 42, Issue 4, Pages 738-745Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10953-013-9999-4
Keywords
Ionic liquids; Ion association; Barthel's low-concentration chemical model; Association constants
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The concentration dependence of molar conductance for 1-butyl-3-methylimidazolium chloride and 1-butyl-3-methylimidazolium hexafluorophosphate in binary mixtures of acetonitrile + methanol was investigated to explore the ion association behavior of imidazolium based ionic liquids. The limiting molar conductance , association constants (K (a) (0) ) and the maximal distance between the oppositely charged ions in ion pairs (R (ij) ) in the mixed solvent mixtures were evaluated following the framework of Barthel's low-concentration chemical model. The investigated ILs display opposing trends in ion association behavior with change in solvent composition of acetonitrile + methanol binary mixtures. The results are discussed in light of ionic liquid and solvent specific ion-solvent and ion-ion interactions in the mixed solvent systems.
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