EQUILIBRIUM STUDIES ON Ni(II) and Cu(II) COMPLEXES with 4,7- DIMETHYL-1,10-PHENANTHROLINE and ACIDIC AMINO ACIDS in AQUEOUS SOLUTION

Abstract

The aim of this study is to determine the protonation constants of selected ligands {4,7dimethyl-1,10-phenanthroline (4,7-dmphen), aspartic acid (asp), and glutamic acid (glu)} and their stability constants of (1:1) and (1:1:1) complexes with Ni(II) and Cu(II) ion have been determined I = 0.1 M KCl and T = 298.15 K. The protonation constants of the 4,7-dmphen, asp, and glu and their stability constants of the (1:1) and (1:1:1) Ni(II) and Cu(II) complexes have been computed performing BEST program. Moreover, SPE program has been used to determine the distribution of the species occurred in aqueous solution medium. The stability constants of the (1:1:1) Ni(II) and Cu(II) complexes are compared with those of the corresponding to the stability of the (1:1) Ni(II) and Cu(II) complexes with regard to Δlog K values.