Barthel, Josef and Buchner, Richard and Hölzl, C. and Conway, B.E. (1998) Dynamics of molten CF3SO3H·H2O probed by temperature dependent dielectric spectroscopy. Journal of the Chemical Society, Faraday Transactions 94 (14), pp. 1953-1958.
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The complex permittivity of CF3SO3H·H2O was studied in the frequency range 0.3-89 GHz at 298-338 K The microwave spectra which show very broad absorption are analyzed in terms of four Debye processes with relaxation times τ1>τ2>τ3>τ4. Whereas τ2, τ3 and τ4 exhibit Arrhenius behavior at all temps., the relaxation time of the slowest process, τ1, exhibits an unusual temp. dependence which can be fitted by assuming two Arrhenius equations intersecting at ∼315 K At T ≥ 315 K the τ2 process is assigned to rotation of a mixt. of the free acid and its anion. The relaxation time τ3 arises from the reorientation of H2O or H3O+. For both relaxation processes hydrodynamic boundary conditions are close to slip. For the high-frequency process, τ4, the comparison with results from MOPAC calcns. suggests intramol. rotation of the OH-group as the dominating contribution.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||dielec permittivity trifluoromethanesulfonic acid hydrate|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||14 Jun 2012 07:16|
|Last Modified:||14 Jun 2012 07:16|