Transfer Enthalpies of Glycine from Water to Aqueous Organic Solutions

Abstract

Abstract: The enthalpies of solution of glycine in aqueous solutions of urea,formamide,acetamide,DMSOand acetone were measured at298.15 K by a RD496-Ⅲ microcalorimeter.The transfer enthalpies(ΔtrH) ofglycine from water to aqueous organic mixtures were derived and interpreted qualitatively with structural hydra-tion interaction model.The results suggest that hydrophilic-hydrophilic interaction between glycine and cosol-vent molecule gives a negative contribution to the transfer enthalpies of glycine,while the hydrophilic hydro-phobic interaction makes a positive contribution.The relative position ofΔtrH-composition profiles viz.urea <formamide <0 <acetamide <DMSO<acetone,characterizes the hydrophobicity or hydrophilicity of the cosol-vent molecule and correctly reflectes the solute-solvent interaction in the transfer process.

Key words: Glycine, Transfer enthalpies, Urea, Formamide, Acetamide, DMSO, Acetone

CLC Number:

O642

TrendMD:

MA Lin, LIN Rui-Sen, LIN Gui-Mei, XUNan. Transfer Enthalpies of Glycine from Water to Aqueous Organic Solutions[J]. Chem. J. Chinese Universities, 2005, 26(11): 2128.

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Transfer Enthalpies of Glycine from Water to Aqueous Organic Solutions

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