Akilan, C. and Hefter, Glenn and Rohman, Nashiour and Buchner, Richard (2006) Ion Association and Hydration in Aqueous Solutions of Copper(II) Sulfate from 5 to 65 °C by Dielectric Spectroscopy. Journal of Physical Chemistry B 110 (30), pp. 14961-14970.
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Aq. solns. of copper(II) sulfate have been studied by dielec. relaxation spectroscopy (DRS) over a wide range of frequencies (0.2 .ltorsim. ν/GHz ≤ 89), concns. (0.02 ≤ m/mol kg-1 .ltorsim. 1.4), and temps. (5 ≤ t/°C ≤ 65). The spectra show clear evidence for the simultaneous existence of double-solvent-sepd., solvent-shared, and contact ion pairs at all temps., with increasing formation esp. of contact ion pairs with increasing temp. The overall ion assocn. const. K°A corresponding to the equil.: Cu2+(aq) + SO42-(aq) .dblharw. CuSO40(aq) was found to be in excellent agreement with literature data over the investigated temp. range. However, the precision of the spectra and other difficulties did not allow a thermodn. anal. of the formation of the individual ion-pair types. Effective hydration nos. derived from the DRS spectra were high but consistent with simulation and diffraction data from the literature. They indicate that both ions influence solvent water mols. beyond the first hydration sphere. The implications of the present findings for previous observations on copper sulfate solns. are briefly discussed.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||copper sulfate aq soln hydration ion pairing dielec spectroscopy thermodn ion pairing copper sulfate aq soln dielec spectroscopy|
|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 05:31|
|Last Modified:||11 Jun 2012 05:31|