V. I. Smirnov, V. G. Badelin
Jul 1, 2014
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0
Influential Citations
5
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Journal
Journal of Molecular Liquids
Abstract
Abstract Enthalpies of dissolution of glycyl- L -tyrosine in the mixtures of water with methanol (MeOH), ethanol (EtOH), propanol (1-PrOH), 2-propanol (2-PrOH), acetonitrile (AN), 1,4-dioxane (DO),acetone (AN), dimethylsulfoxide (DMSO), formamide (FA), N -methylformamide (NMF), N,N -dimethylformamide (DMF) and N,N -dimethylacetamide (DMA) have been measured at 298.15 K. The standard enthalpies of the solution ( Δ sol H ∘ ) and transfer ( Δ tr H ∘ ) of glycol- L -tyrosine from water into aqueous solution of organic co-solvents as well as the enthalpy coefficients of pairwise interaction ( h xy ) have been calculated. The interrelation between the enthalpy characteristics of dissolution (transfer) of glycyl- L -tyrosine and the composition of aqueous organic mixtures was established. Contributions of the organic co-solvent properties (molar volume, cohesion energy density, dipolarity/polarizability, acidity and basicity) to the energy of pairwise interactions were estimated quantitatively by means of a modified Kamlet–Taft equation. Some characteristics of intermolecular interactions of glycyl- L -tyrosine with the molecules of organic co-solvents with the analogous characteristics of glycylglycine and diglycylglycine were compared.