Schroedle, Simon and Hefter, Glenn and Buchner, Richard (2007) Dielectric spectroscopy of hydrogen bond dynamics and microheterogenity of water plus dioxane mixtures. JOURNAL OF PHYSICAL CHEMISTRY B, 111 (21). pp. 5946-5955. ISSN 1520-6106,
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Mixtures of water or D2O + 1,4-dioxane (DX) have been studied at 25 degrees C by dielectric relaxation spectroscopy over a wide range of frequencies (0.2 <= nu/GHz <= 89) for DX mole fractions 0 <= x(2) <= 0.67. The spectra were best fitted by the sum of two Debye terms. The slower process was assigned to the cooperative relaxation of the hydrogen-bond network of water, whereas the faster mode reflects the dynamics of H2O molecules in a DX-rich environment. Analysis of the relaxation parameters revealed a largely microheterogeneous structure of the mixtures. The marked slowing-down of the cooperative mode on addition of DX is ascribed to the reduction of available H-bond acceptor sites and geometrical constraints on the H2O molecules in the water-rich regions.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LOCAL ENERGY FLUCTUATIONS; PARTIAL MOLAR VOLUMES; ALKALI-HALIDES; THERMODYNAMIC PROPERTIES; MICROWAVE ABSORPTION; COOPERATIVE DYNAMICS; MOLECULAR STRUCTURE; ION-PAIR; RELAXATION; CONDUCTANCE; |
| 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: | 09 Dec 2020 05:55 |
| Last Modified: | 09 Dec 2020 05:55 |
| URI: | https://pred.uni-regensburg.de/id/eprint/32751 |
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