Abstract
This paper reports the variations of different physical and thermodynamic properties of a mixture of dipeptide−metal salt in aqueous solutions as well as in aqueous ethanol mixtures. Specifically, the apparent molar volumes and apparent molar compressibilities of glycylglycine and Mn(COOCH3)2 have been determined at T = (288.15 to 318.15) K, and the resulting data have been used to estimate the limiting volume (Φ0V) and compressibility (Φ0K). Their concentration variations are examined to study the effect due to solute−solute and solvent−solvent interactions. The resulting data have been used to interpret the volume and compressibility contributions of the components in terms of H-bonding and dipole−dipole interactions. It was found that these interactions in aqueous solutions were measurably distinct in some cases from those in alcohols. An unusual behavior in the refractive index values indicates a measure of the relative extent of the polar domains.
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