Plowas-Korus, Iwona and Buchner, Richard (2019) Structure, molecular dynamics, and interactions in aqueous xylitol solutions. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 21 (43). pp. 24061-24069. ISSN 1463-9076, 1463-9084
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The cooperative dynamics and hydration of aqueous xylitol solutions were investigated at 25 degrees C by broad-band dielectric spectroscopy for solute concentrations c <= 3.251 M. The spectra could be consistently interpreted by assuming a superposition of five modes. From the combined amplitudes of the bulk-water contributions at similar to 18 GHz and similar to 600 GHz the effective xylitol hydration number of 5.66 +/- 0.08 was derived. These hydrating H2O molecules are retarded by a factor of similar to 2.6 compared to the bulk and cause similar to 85% of the relaxation resolved at similar to 5-10 GHz. The remaining amplitude could be attributed to the three central -OH groups of xylitol, which exhibit slower dynamics than the more exposed distal hydroxyl groups peaking at similar to 50 GHz but all having the same effective dipole moment, mu 0eff = 3.43 D. A further xylitol-specific relaxation at similar to 1.5 GHz probably arises from weak xylitol aggregation.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DIELECTRIC-RELAXATION SPECTROSCOPY; ELECTROLYTE-SOLUTIONS; MUTANS STREPTOCOCCI; COLLECTIVE DYNAMICS; WATER SOLUTIONS; HYDRATION; SORBITOL; MIXTURES; REORIENTATION; VISCOSITIES; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Mar 2020 09:16 |
| Last Modified: | 24 Mar 2020 09:16 |
| URI: | https://pred.uni-regensburg.de/id/eprint/25817 |
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