Determination of Stability constants Nickel binary and ternary complexes in aquesous DMSO by Pontentiometric method

Abstract The stability constants of some the binary and ternary system involving Nickel(II) have been studied. Bis-(pyridyl) benzilidene acts as a primary ligand. Glycine, L-alanine, L-phenylalanine, L-leucine L-valine were secondary complex are calculated by SCOGS computer program. reported values ± 0.02 log unit accuracy. protonation increase with an increasing percentage dimethyl sulphoxide. Protanation for glycine, complexes higher indicate that inductive effect is predominant than steric effect. Whereas L-Phenylalanine has high other due to stacking interaction between phenyl ring phenylalanine order constant systems Ni(bpb)(phe)2 > Ni(bpb)(leu)2 Ni(bpb)(val)2 Ni(bpb)(gly)2.