STUDY OF SIMPLE AND MIXED-LIGAND COMPLEXES OF COPPER IONS WITH SOME AMINO-ACIDS AND SUCCINATE ANIONS BY DIFFERENTIAL PULSE POLAROGRAPHY .2.

The formation of binary and ternary complexes of some amino-acids (aspartic acid, glutamic acid and lysine) and succinate with Cu(II) have been investigated using differential pulse (d.p.) polarography. The results reveal the formation of one ternary complex with 1:1:1 stoichiometry. The reduction processes of all the systems were reversible and diffusion controlled. The formation constants of binary and ternary systems have been calculated. The mixed ligand stability constants were calculated statistically and compared with the observed values. The mixing, stabilization and disproportionation constants of the mixed species are also given.