Abstract
The enthalpies of solution (ΔsolHm) of β-alanine in aqueous solutions of acetonitrile (AN), 1,4-dioxane (1,4-DO), acetone (AC), formamide (FA), N-methylformamide (MFA), N,N-dimethylformamide (DMFA), N,N-dimethylacetamide (DMA), and dimethyl sulfoxide (DMSO) have been determined by calorimetric method as a function of organic solvent concentration at 298.15 K. Enthalpies of transfer (ΔtrH°) of β-alanine from water to aqueous organic mixtures as well as the enthalpy coefficients of pairwise interaction (hxy) were calculated from these data. The interrelation between enthalpy characteristics of β-alanine dissolution (transfer) and the composition of water–organic solvent binary mixtures has been ascertained. By means of a modified Kamlet–Taft equation the contributions of different physicochemical properties of organic cosolvents to the energy of β-alanine–cosolvent intermolecular interactions have been estimated quantitatively.
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