Papaiconomou, Nicolas and Zech, Oliver and Bauduin, Pierre and Leveque, Jean-Marc and Kunz, Werner (2012) The effect of position and length of alkyl substituents in pyridinium based ionic liquids on temperature dependent transport properties. ELECTROCHIMICA ACTA, 70. pp. 124-130. ISSN 0013-4686,
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The effect of position and length of alkyl substituent in pyridinium based ionic liquids (IL) has been studied at various temperatures. The IL investigated contained the bis(trifluoromethanesulfonyl)imide (NTf2) anion combined with 1-alkyl-3,5-dimethylpyridinium or 1-alkyl-2,3-dimethylmpyridinium cations, respectively. Data for the conductivity 0-80 degrees C, the viscosity 10-70 degrees C, density 0-80 degrees C and thermal expansion coefficients 0-80 degrees C of the ionic liquids [B23MMPYR][NTf2],[B35MMPYR][NTf2], [O23MMPYR][NTf2]. [O35MMPYR][NTf2] are reported. The viscosity and conductivity data obtained could be well described with the empirical Vogel-Fulcher-Tammann equation. Based on the molar conductivities and viscosities measured from 10 to 70 degrees C, a significant influence of the position of the methyl substituents in the cation on the transport properties has been found. Walden plots of these data demonstrate that the investigated compound can be classified as high ionicity ionic liquids. IL containing 1-alkyl-2,3-dimethylpyrindium cations were found to be closer to the "ideal" KCl line suggesting less ion association compared to their 1-butyl-3,5-dimethylpyridinium homologues. (C) 2012 Elsevier Ltd. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MOLTEN-SALTS; PHYSICOCHEMICAL PROPERTIES; IMIDAZOLIUM; PIPERIDINIUM; CONDUCTANCE; PRESSURE; CATIONS; Ionic liquids; Dimethylpyridinium cations; Temperature dependent transport properties; Walden plot; Cosmotherm |
| 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) > Prof. Dr. Werner Kunz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 13 May 2020 09:17 |
| Last Modified: | 13 May 2020 09:17 |
| URI: | https://pred.uni-regensburg.de/id/eprint/18710 |
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