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Temperature dependence of the electrical conductivity of imidazolium ionic liquids |
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| Authors: | Leys Jan Wübbenhorst Michael Preethy Menon Chirukandath Rajesh Ravindran Thoen Jan Glorieux Christ Nockemann Peter Thijs Ben Binnemans Koen Longuemart Stéphane |
| Affiliation: | Laboratorium voor Akoestiek en Thermische Fysica, Departement Natuurkunde en Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200D, bus 2416, 3001 Leuven, Belgium. jan.leys@fys.kuleuven.be |
| Abstract: | The electrical conductivities of 1-alkyl-3-methylimidazolium tetrafluoroborate ionic liquids and of 1-hexyl-3-methylimidazolium ionic liquids with different anions were determined in the temperature range between 123 and 393 K on the basis of dielectric measurements in the frequency range from 1 to 10(7) Hz. Most of the ionic liquids form a glass and the conductivity values obey the Vogel-Fulcher-Tammann equation. The glass transition temperatures are increasing with increasing length of the alkyl chain. The fragility is weakly dependent on the alkyl chain length but is highly sensitive to the structure of the anion. |
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