Synthesis and Spectroscopic Characterization of Some Novel Polypyridine and Phenanthroline Complexes of Mn(II), Fe(II), Co(II) and Zn(II) Incorporating a Bidentate Benzothiazolyl Hydrazone Ligand

Abstract

Eight novel polypyridine and phenanthroline complexes of Mn(II), Fe(II), Co(II) and Zn(II) (1-8) of the type [M(N-N) 2 (L)]Cl 2 where N-N is 2,2'-bipyridine (bpy) 2 and 1,10-phenanthroline (phen) 2 with three benzothiazolyl hydrazone ligands L 1 -L 3 were synthesized and characterized by elemental analysis, thermal conductance, UV-Vis, IR, 1 H NMR, electronic absorption and emission spectral methods. The IR, 1 H NMR, electronic absorption and emission spectral data revealed that the ligands coordinate with the metal ions in a bidentate fashion through azomethine nitrogen and phenolic oxygen to form complexes. The analytical and thermogravimetrical data correlated with the observations from IR, 1 H NMR, electronic absorption and emission spectra permitted to attribute that the metal ions are six coordinated in all the complexes.