Abstract
The enthalpies of solution ΔsolHm have been determined for trans-4-hydroxy-l-proline (4-hydroxyproline) in aqueous solutions of formamide (FA), N-methylformamide (MFA), N,N-dimethylformamide (DMF) and N, N-dimethylacetamide (DMA). The measurements have been made at 298.15K and mole fraction of amide x2=(0–0.3) on the precise “isoperobol” calorimeter. The results obtained have been used to calculate the standard enthalpies of solution (ΔsolH°) and transfer (ΔtrH°) of 4-hydroxyproline from water into mixtures as well as the enthalpic coefficients of pairwise interaction (hxy) of 4-hydroxyproline with amides in aqueous solution. The interrelation between enthalpy characteristics of dissolution (transfer) of 4-hydroxyproline and the composition of (water+amide) binary mixtures has been established. Contributions of the amides properties (molar volume, dipolarity/polarizability, acidity, and basicity) to the variation of the energy of pairwise interactions have been estimated quantitatively by means of a modified Kamlet-Taft equation.
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