Acid-base and complexation properties of α-L-alanin in water-formamide mixtures

Abstract

The constants of copper (II) complexation with α-L-alanine in water and water-formamide solvents were determined potentiometrically at 298 K; the dissociation constants for alanine amino group was also determined. It was found that the stability of the [CuAla]+ complex is significantly reduced with an increase in the formamide content in solution. The heat balance of the Cu2+-alanine-water-formamide system was considered for the process of Cu(NO3)2 transfer from water to an aqueous solution of alanine using the earlier determined Kstab and thermochemical data.