Abstract
The formation equilibria of the complexes of some transition metal ions and triazolylazonaphthol (TAN) have been investigated by a potentiometric technique. The stepwise formation constants of the complexes formed in solution were calculated using the non-linear least-squares computer program MINIQUAD. The concentration distribution of the complex species was resolved. Complexes of Cu(II), Co(II), Ni(II), Cd(II), Zn(II), UO
2
(VI) and Pd(II) have been synthesised and characterized by elemental analyses, electrolytic conductance, spectral and magnetic measurements. The ligand forms 1:2 complexes (metal ion : ligand), except for Pd(II), where 1:1 complex is formed. The Ni(II) and Co(II) complexes are octahedral and of the general formula ML
2
, where L is the uninegatively charged tridentate ligand (ONN donor set). The Cu(II) complex is binuclear with a ligand-bridged structure.