Buchner, Richard and Capewell, S.G. and Hefter, Glenn and May, P.M. (1999) Ion-pair and solvent relaxation processes in aq. Na2SO4 solutions. Journal of Physical Chemistry B 103 (7), pp. 1185-1192.
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The complex dielec. permittivity of aq. sodium sulfate solns. (0.025 ≤ c/mol dm-3 ≤ 1.6) was detd. in the frequency range 0.2 ≤ ν/GHz ≤ 20 with a com. dielec. measurement system based on a vector network analyzer. The dielec. permittivity spectra were supplemented with interpolated literature data at 12 ≤ ν/GHz ≤ 89. To fit the spectra, a superposition of three Debye relaxation processes was necessary. The slow and intermediate dispersion steps were assigned to the tumbling motion of doubly solvent-sepd. (2SIP) and solvent-shared (SSIP) NaSO4- ion pairs, resp. The fast process, of amplitude S3, was explained with the collective relaxation of the solvent. Effective solvation nos. were deduced from the effect of Na2SO4 concn. on S3. From the ion-pair dispersion amplitudes, the following data were obtained: S1 and S2, the concns. c2SIP and cSSIP, and, eventually, the overall stoichiometric stability const., βNaSO4-.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||ion pairing solvent relaxation aq sodium sulfate|
|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 12:43|
|Last Modified:||14 Jun 2012 12:43|