Barthel, Josef and Buchner, Richard and Bachhuber, K. and Hetzenauer, H. and Kleebauer, M. and Ortmeier, H. (1990) Molecular processes in electrolyte solutions at microwave frequencies. Pure and Applied Chemistry 62 (12), pp. 2287-2296.
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The microwave dispersion and absorption spectra are discussed for various protic and aprotic electrolyte solns. and their solvents over large frequency ranges, in general 0.9-90 GHz. Wider frequency ranges are covered for water (0.9-409 GHz) and for methanol, N-methylformamide, and N,N-dimethylformamide (all 0.9-293 GHz). The role of insufficient frequency coverage is critically discussed. Permittivities and relaxation times of the underlying relaxation processes are compared for electrolyte solns. of the hydrogen-bonding solvents water, methanol and higher alcs., formamide, N-methylformamide, and the dipolar aprotic solvents acetonitrile, propylene carbonate, DMSO, and N,N-dimethylformamide. The hydrogen-bonding mode at τ ≃1 ps is not affected by the addn. of alkali metal and tetrabutylammonium salts, in contrast to the bulk and the internal relaxation of the H-bonded chains; NH4+ in methanol produces peculiar effects. For 1:1-electrolytes ion-pair formation is detectable in all solvents of static permittivity below 50; the concn. dependence of the corresponding relaxation time permits sepn. into rotational and kinetic modes of ion-pair formation and decompn.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||hydrogen bond electrolyte soln microwave frequency liq structure electrolyte soln|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||15 Jun 2012 09:04|
|Last Modified:||15 Jun 2012 09:04|