Wurm, Bernhard and Muensterer, Michael and Richardi, Johannes and Buchner, Richard and Barthel, Josef (2005) Ion association and solvation of perchlorate salts in N,N-dimethylfon-namide and N,N-dimethylacetamide - A dielectric relaxation study. JOURNAL OF MOLECULAR LIQUIDS, 119 (1-3). pp. 97-106. ISSN 0167-7322, 1873-3166
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The results of dielectric relaxation experiments on solutions of LiClO4, NaClO4 and Bu4NClO4 in N,N-dimethylfonnamide (DNIF), and N,N-dimethylacetamide (DMA), performed at 25 degrees C in the frequency range 0.2 <= v/GHz <= 89 are presented. For all electrolytes, a solute relaxation process due to ion pairs is observed in addition to the solvent relaxation. The alkali salts form predominantly solvent-shared ion pairs in DNIF and DMA, whereas contact ion pairs are observed for Bu4NClO4 In all cases, the rate of ion-pair formation is nearly diffusion controlled. Effective solvation numbers were deduced from the solvent dispersion amplitude. Data suggest that the anion-solvent interactions are weak, whereas the alkali ions form a well-defined primary solvation shell. Interestingly, irrotational bonding of solvent molecules by Bu4N+ is observed, possibly due to steric interactions. (c) 2004 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTROLYTE-SOLUTIONS; LITHIUM PERCHLORATE; N-METHYLFORMAMIDE; PAIR; N,N-DIMETHYLFORMAMIDE; CONDUCTANCE; FRICTION; SOLVENTS; PERMITTIVITY; SPECTROSCOPY; ion association; solvation; dielectric relaxation |
| 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. Richard Buchner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 11 May 2021 12:54 |
| Last Modified: | 11 May 2021 12:54 |
| URI: | https://pred.uni-regensburg.de/id/eprint/36131 |
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