Synthesis and spectroscopic properties of some transition metal complexes with new azo-dyes derived from thiazole and imidazole

Abstract

A new ligand containing thiazole and imidazole rings as organic heterocyclic azo dye compound 2-[-2-(6-nitro benzothiazolyl)azo]- imidazole (NBTAI) was prepared by coupling reaction between 6-nitro benzothiazole chloride with imidazole in alkaline alcoholic solution. New six complexes with Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) were prepared and characterized by elemental analysis, molar conductance measurements, magnetic moment measurements at room temperature, infrared and electronic spectra. The analytical data show that the metal to ligand ratio [M:L] in all complexes is (1:2). The spectral and analytical data revealed that this ligand behaves as a bidentate chelating agent and the coordination number of all metal ions are found to be six in coordination through the nitrogen N3 atom of azo methine group of heterocyclic imidazole ring and the other nitrogen atom of azo group which is the farthest of imidazole molecule, from two ligands with two molecules and two chloride ions. The results are explained in the light of these analysis.