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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Work is partially supported by the Russian fund of basic researches (the Grant No. 12-03-97508-r_center_a).
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Korolev, V.P., Antonova, O.A. Thermal properties and interactions of l-proline in aqueous solutions of NaCl or KCl at different temperatures. J Therm Anal Calorim 115, 955–960 (2014). https://doi.org/10.1007/s10973-013-3253-6
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DOI: https://doi.org/10.1007/s10973-013-3253-6