Studies on Solution Properties of Some Amino Acids in Aqueous Mixture of Catechol

Apparent molar volumes, V φ, viscosities, η, and apparent isentropic compressibilities, K φ, of glycine, L-alanine, L-valine and L-leucine in 0.05, 0.10, 0.15 mol Kg−1 catechol solutions have been determined at 298.15 K by measuring the densities, viscosities and ultrasonic speed of the above solutions respectively. The standard partial molar volumes, , standard volumes of transfer, , standard partial isentropic compressibilities, , transfer compressibilities, , hydration number, N w , of the amino acids have been calculated for investigating the various interactions in the ternary solutions. The linear correlation of partial molar volume and viscosity B-coefficients with increasing number of carbon atoms in the alkyl chain have been used to explain the contribution of charged end group ( , COO−) and the ‒CH2 group to . The results have been interpreted in the light of solute-solvent interactions in the mixed ternary solutions.