Schrödle, S. and Hefter, Glenn and Buchner, Richard (2007) Dielectric Spectroscopy of Hydrogen Bond Dynamics and Microheterogenity of Water + Dioxane Mixtures. Journal of Physical Chemistry B 111 (21), pp. 5946-5951.
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Mixts. of water or D2O + 1,4-dioxane (DX) have been studied at 25 °C by dielec. relaxation spectroscopy over a wide range of frequencies (0.2 ≤ ν/GHz ≤ 89) for DX mole fractions 0 ≤ x2 ≤ 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 mols. in a DX-rich environment. Anal. of the relaxation parameters revealed a largely microheterogeneous structure of the mixts. The marked slowing-down of the cooperative mode on addn. of DX is ascribed to the redn. of available H-bond acceptor sites and geometrical constraints on the H2O mols. in the water-rich regions.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||dielec spectroscopy hydrogen bond dynamics microheterogeneity water dioxane mixt|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||11 Jun 2012 05:39|
|Last Modified:||11 Jun 2012 05:39|