Study of Various Factors Affecting the Stability of Ternary Cu(II) and Ni(II) Complexes

The stability constants of the ternary M(II) complexes [MAL], where M(II) refers to Cu(II) and Ni(II), A refers to 2,6-pyridinedicarboxylic acid (dpa) and iminodiacetic acid (imda) and L refers to glycine, α-alanine, phenylalanine, tyrosine, tryptophan, ethylenediamine, 1,3-propanediamine, oxalic acid, catechol, catechuic acid, tiron, pyrogallol, o-aminophenol, and o-phenylenediamine, have been determined potentiometrically by using SCOGS computer programme. Probable reasons for less negative ΔlogK values of the ternary complexes have been discussed.