Wachter, Wolfgang and Fernandez, Sarka and Buchner, Richard and Hefter, Glenn (2007) Ion association and hydration in aqueous solutions of LiCl and Li2SO4 by dielectric spectroscopy. Journal of Physical Chemistry B 111 (30), pp. 9010-9017.
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A systematic study of the dielec. relaxation spectra of aq. solns. of LiCl and Li2SO4 has been made at solute concns. of 0.05 ≤ c/M ≤ 1.0 and 2.0, resp., and over a wide range of frequencies (0.2 ≤ ν/GHz ≤ 89) at 25°. The spectra were best described by a superposition of four Debye processes, consisting of the two well-known water relaxations at ca. 8 and 0.5 ps and two ion-pair contributions at ca. 200 and 20 ps, corresponding to the presence of double-solvent-sepd. (2SIP) and solvent-shared (SIP) ion pairs, resp. Consistent with spectroscopic studies, no contact ion pairs were detected over the studied concn. range. The overall ion assocn. consts. K°A obtained were in good agreement with literature data for both salts. Detailed anal. of the solvent relaxations indicated that Li+ has a significant second solvation sheath although there were differences between the effective hydration nos. obtained from LiCl and Li2SO4, which might arise from competition for the solvent from the anions.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||lithium chloride sulfate aq soln ion pairing hydration|
|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 05:40|
|Last Modified:||11 Jun 2012 05:40|