MIXED-LIGAND COMPLEXES OF COPPER WITH AMINO-ACIDS AND TARTRATE USING DIFFERENTIAL PULSE POLAROGRAPHY .1.

The differential pulse (d.p.) polarography technique was used to study simple and mixed ligand complexes of copper(II) with tartrate anions and amino-acids (threonine, valine and isoleucine). The reduction of simple and mixed complexes was reversible and diffusion controlled, one mixed complex being formed in each case. The formation constants of simple and mixed complexes have been calculated. The mixing constants of ternary systems as well as the stabilization constants were also calculated. The formation constants of the ternary complexes were calculated statistically and compared with the observed values.