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Thermal properties and interactions of l-proline in aqueous solutions of NaCl or KCl at different temperatures
Authors:V P Korolev  O A Antonova
Institution:1. G. A. Krestov Institute of Solution Chemistry, Russian Academy of Sciences, 1, Academicheskaya Street, 153045, Ivanovo, Russia
Abstract:The enthalpies of solution of l-proline in aqueous electrolyte solutions within the electrolyte molality range up to 4.9 mol kg?1 of NaCl and up to 4.0 mol kg?1 of KCl at 288, 298 and 313 K have been measured by the calorimetric method. Enthalpies of transfer of l-proline from water to aqueous electrolyte solutions up to saturation have been derived at 273–348 K. The enthalpic and heat capacity parameters of pair and triplet interaction of l-proline with electrolyte in water have been evaluated. Enthalpic parameters of pair interaction at 298 K have been compared to similar parameters for glycine and l-alanine. The temperature changes of reduced enthalpy, and also the change of entropy and reduced Gibbs energy of transfer of l-proline from water to aqueous electrolyte solution at temperature rise from 273 to 323 K have been determined. It has been shown that the entropy–enthalpy compensation takes place for transfer processes.
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