Synthesis and Characterization of Some New Neutral Bis Chelates of Co(II), Ni(II), Cu(II), Pd(II) and Zn(ll) With Tridentate Triazene-1-Oxides

Abstract

Ligands having an OH or OCH₃., substituent on the phenyl 3 ortho to the (N) nitrogen atom of triazene-1-oxide expected to behave as tridentate ligands have been isolated and their chelates with Co(II), Ni(II), Cu(TI), Pd(II) and Zn(II) have been investigated by elemental analyses and molecular weight determinations, IR and electronic spectral and magnetic studies. On the basis of the evidence gathered it seems probable that Co(II), Ni(II) and Zn(II) forms neutral bis-chelates with an octahedral geometry whereas Cu(II) and Pd(II) forms neutral bis-chelates v/ith a square planar configuration. Whereas in the former these ligands act as tridentate with the participation of OH/OCH, in complex formation, in the latter they behave only as a bidentate ligand due to the non-participation of OH/OCH₃ in complexation. The formation constants of some Cu(II) and Zn(II) complexes have also been determined using pH titration technique.