Polarographic analysis of the mixed-ligand system Cu(II)-glycine-glycinate

The polarographic method has been applied to the study of the mixed-ligand system Cu(II)-glycine-glycinate, in aqueous medium, at I = 1.0M (NaClO(4)) and 25 -/+ 0.1 degrees . The stabilization of the mixed complex CuG(G(-))](+) has been made clear and its stability constant (beta(11) = 1 x 10(9)) has been determined. The stability constants of the complexes CuG]I(2+) (beta(10) = 17), CuG(2)](2+) (beta(20) = 230), Cu(G(-))](+) (beta(01) = 2.1 x 10(8)) and Cu(G(-))(2)] (beta(02) = 1.7 x 10(15)) have also been calculated.