Electroconductivity of 1-butyl-3-methylimidazolium tetrafluoroborate solutions in propylene carbonate in a wide concentration range
Abstract
The results of conductometric investigation of 1-butyl-3-methylimidazolium tetrafluoroborate [BMIM][BF4] in propylene carbonate (PC) over the concentration range from 1∙10-3 till 2.5 mol/dm3 at 5, 15, 25, 35, 45, 55, 75, 95, 115 °С are presented. By using Lee-Wheaton equation the limiting molar electrical conductivities (EC) and ion association constants for [BMIM][BF4] in PC have been determined from experimental conductivity data in diluted concentration range. It was established that studied electrolyte in PC is characterized by a weak association. The applicability of pseudolattice model of solution for the description of the concentration dependence of the molar EC has been analyzed. It was found that the upper limit of pseudolattice model applicability decreases with temperature increase from 2.2 mol/dm3 (at 5 °C) to 1.1 mol/dm3 (115 °C). It was established that the concentration dependence of the specific EC in a wide range is well-described by the empirical Casteel-Amis equation. The values of maximal specific EC founded with its help for [BMIM][BF4] in PC can be predicted with reasonable accuracy within pseudolattice model of solutions using limiting molar EC values.
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