Zhang, Xin-Xing and Liang, Min and Hunger, Johannes and Buchner, Richard and Maroncelli, Mark (2013) Dielectric Relaxation and Solvation Dynamics in a Prototypical Ionic Liquid plus Dipolar Protic Liquid Mixture: 1-Butyl-3-Methylimidazolium Tetrafluoroborate plus Water. JOURNAL OF PHYSICAL CHEMISTRY B, 117 (49). pp. 15356-15368. ISSN 1520-6106,
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Dielectric and solvation data on mixtures of 1-butyl-3-methylimidazilium tetrafluoroborate ([Im(41)][BF4]) + water are reported and used to examine the utility of dielectric solvation models. Dielectric permittivity and loss spectra (25 C) were recorded over the frequency range 200 MHz to 89 GHz at 17 compositions and fit to a 4-Debye form. Dynamic Stokes shift measurements on the solute coumarin 153 (C153), made by combining fluorescence upconversion (80 fs resolution) and time-correlated single photon counting data (20 ns range), were used to determine the solvation response at 7 compositions (20.5 degrees C). All properties measured here were found to depend upon mixture composition in a simple continuous manner, especially when viewed in terms of volume fraction. Solvation response functions predicted by a simple dielectric continuum model are similar to but similar to 7-fold faster than the spectral response functions measured with C153. The solvation data are in better agreement with the recently published predictions of a semimolecular model of Biswas and co-workers [J. Phys. Chem. B 2011, 115, 4011], but these latter predictions are systematically slow by a factor of similar to 3.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PROBING INTERMOLECULAR INTERACTIONS; AQUEOUS-SOLUTIONS; BINARY-MIXTURES; COUMARIN 153; PREFERENTIAL SOLVATION; ROTATIONAL RELAXATION; AGGREGATION BEHAVIOR; PHYSICAL-PROPERTIES; SOLVENT RELAXATION; POLAR; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie 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: | 23 Mar 2020 07:52 |
| Last Modified: | 23 Mar 2020 07:52 |
| URI: | https://pred.uni-regensburg.de/id/eprint/15527 |
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