Complexes of vitamin B 6—IX Ternary complexes of Ni(II), Cu(II) and Zn(II) with pyridoxamine and salicylic acid

Abstract

Equilibrium-based computer models were used in the calculation of the stability constants of the ternary complexes of Ni(II), Cu(II) and Zn(II) involving pyridoxamine (PM) and salicylic acid (Sal) from pH-metric data at 0.5 M KNO 3 and 30°C. It has been concluded that most of the complexes are protonated with the possible location of proton on PM moiety. The ternary stability constants of some ternary complexes were discussed in terms of binary stability constants of PM and Sal. The model equilibria were correlated with pertinent published equilibria.