Tromans, A. and May, P.M. and Hefter, Glenn and Sato, T. and Buchner, Richard (2004) Ion Pairing and Solvent Relaxation Processes in Aqueous Solutions of Sodium Malonate and Sodium Succinate. Journal of Physical Chemistry B 108 (36), pp. 13789-13795.
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Dielectric relaxation spectra have been measured for aqueous solutions of sodium malonate and sodium succinate over a wide range of frequencies ( 0.2 <= n/GHz <=89) and solute concentrations (0.025 <= c/M <= 1.0). In addition to the usual processes associated with bulk water, two further relaxation processes were detected. The faster of these, with a relaxation time of ~16 ps, is unusual and was attributed to the presence of 'slow' water in the hydration shells of the anions. The extent of this hydration shell is rather 'fragile' (concentration-dependent) for malonate but not for succinate. The second, slower, process was attributed to the presence of ion pairs NaX-(aq). Unambiguous determination of the structure of the ion pair was not possible because of the internal flexibility of the anions but the data were most consistent with a chelated solvent-shared ion pair. The kinetics of formation and dissociation of the ion pairs were evaluated from the effects of solute concentration on their relaxation times.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||dielec relaxation sodium malonate succinate aq soln|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||12 Jun 2012 10:57|
|Last Modified:||12 Jun 2012 10:57|