COMPLEXES OF VITAMIN-B6 .7. TERNARY COMPLEXES OF COBALT(II), NICKEL(II), AND COPPER(II) INVOLVING PYRIDOXAMINE AND SOME AMINO-ACIDS

The stability constants of the ternary Cu(II), Ni(II), and Co(II) complexes containing pyridoxamine (PM) and as a second ligand (L) glycine, DL-alanine, DL-valine, and β-phenylalnine were determined by pH-metric titration in 0.50 M KNO3 at 30°C. The corresponding constants of the equilibrium, {A figure is presented} log X, are greater than would be expected for purely statistical reasons (log X = 0.6), except for few complex cases of Co(II). It has been also concluded that amino acids compete more than pyridoxamine for Ni(II) and Co(II) through the formation of 1:2:1:0 species rather than 2:1:1:0 of PM-:L-:M2+:H+. © 1979.