Complexes of vitamin B6. Part XI. Ternary complexes of some bivalent metal ions with ethylenediamine and pyridoxamine

Summary The stability constants of ternary Co^II, Ni^II, Cu^II, Zn^II and Cd^II complexes containing pyridoxamine as a first and ethylenediamine as a second ligand were determined by pH titration at I =0.50M NaNO₃ and 30 °C. Most of the complexes are protonated, probably on the pyridoxamine moiety. The formation of the ternary complex species is discussed in terms of binary species formation. Spectral characteristics of some of the ternary complex systems are discussed.Part X. Binary, Ternary and Quaternary Complexes Involved in Systems of Pyridoxamine-Glycine or Glycylglycine-Imidazole with Some Bivalent Metal Ions,21st Internat. Conf. on Coord. Chem., Toulouse, France (1980);