Buchner, Richard and Sipos, P. and Hefter, Glenn and May, P.M. (2002) Dielectric Relaxation of Concentrated Alkaline Aluminate Solutions. Journal of Physical Chemistry A 106 (28), pp. 6527-6532.
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The complex dielec. permittivity of concd. aq. alkali aluminate solns. at total concns. 1 .ltorsim. [Al]T/mol dm-3 .ltorsim. 6 with either [Na]T = 8.33 mol dm-3 or [Al]T/[Na]T = 0.750 has been detd. at 25 °C in the frequency range 0.5 .ltorsim. ν/GHz ≤ 20. All soln. spectra could be represented as a superposition of a Cole-Cole relaxation-time distribution for the solvent relaxation with an addnl. low-frequency Debye dispersion assigned to the solute. The variation of the effective hydration no., deduced from the water dispersion amplitude, shows that the aluminate ion, Al(OH)4-, is less strongly solvated than the hydroxide ion, OH-. Addnl., a "melting" of the hydration shells is obsd. at high concn., probably due to co-sphere overlap and/or packing effects. The features of the solute relaxation are consistent with solvent-shared ion pairs of Na+ with a previously proposed dimeric anion, [(HO)3Al-O-Al(OH)3]2-. However, the data are not sufficient for an unequivocal assignment.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||aluminate aq alk soln dielec relaxation density viscosity elec aq aluminate alk soln|
|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 12:28|
|Last Modified:||14 Jun 2012 12:28|