Schreiner, Christian and Zugmann, Sandra and Hartl, Robert and Gores, Heiner J. (2010) Fractional Walden Rule for Ionic Liquids: Examples from Recent Measurements and a Critique of the So-Called Ideal KCl Line for the Walden Plot. JOURNAL OF CHEMICAL AND ENGINEERING DATA, 55 (5). pp. 1784-1788. ISSN 0021-9568,
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Temperature-dependent conductivity, viscosity, and density of four ionic liquids (ILs), 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF4]), 1-ethyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]), 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([EMIM][NTf2]), and 1-ethyl-3-methylimidazolium dicyanamide ([EMIM][DCA]), were measured with high precision from +80 degrees C down to -35 degrees C, if possible. Fitting parameters for the Vogel-Fulcher-Tammann (VFT) equation were obtained for conductivity and viscosity data, and obtained data were analyzed with the help of the fractional Walden rule and the Walden plot. Excellent linear behavior is observed for all ILs; however, the average slope is not unity as expected for the ideal Walden rule, but 0.92 +/- 0.02. The so-called ideal KCl line that is used to compare ILs within the Walden plot is discussed, as literature data for aqueous KCl solutions show that its assumed ideality has to be modified.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TEMPERATURE-DEPENDENCE; AQUEOUS-SOLUTIONS; CONDUCTIVITY; ELECTROLYTES; VISCOSITY; CONDUCTANCE; MIXTURES; ANION; CELLS; LAW; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Heiner Jakob Gores |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 03 Aug 2020 05:56 |
| Last Modified: | 03 Aug 2020 05:58 |
| URI: | https://pred.uni-regensburg.de/id/eprint/24771 |
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