Abstract
The dissolution enthalpies of N-methylglycine were obtained in aqueous solutions of formamide (FA), N-methylformamide (MFA), N,N-dimethylformamide (DMF), acetamide (AM) and N, N-dimethylacetamide (DMA) with amide mole fraction (x2) from 0 to 0.25 at T=298.15K. The results obtained have been used to calculate the standard values of dissolution enthalpies (ΔsolH∘) and transfer enthalpies (ΔtrH∘) of N-methylglycine from water into (water+amide) mixtures as well as the coefficients of pairwise interaction (hxy) of N-methylglycine with the amide molecules in aqueous solutions. The interdependence between enthalpy characteristics of N-methylglycine dissolution (transfer) and the concentration of amide in aqueous solutions has been established. Comparison of the resulting data with those obtained earlier for glycine (Gly) and (L-)DL-α-alanine (Ala) in the same mixed solvents at T=298.15K has been made.
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