Abstract
The present study describes the synthesis and characterization of some transition meal complexes derived from azo ligand derived from condensation 4-hydroxycoumarine and 2-aminobenzothiazole. The azo ligand was characterized by C.H.N.S elemental analyses, GC-Mass spectroscopy, H NMR and FT-IR spectra. The metal complexes with the new azo dye were isolated by the direct reactions of the metal chlorides of cadmium(II), zinc(II), cobalt(II), nickel(II) and copper(II) ions with the alkaline solution of free ligand to afford the following complex [ML(H2O)2Cl] where M=Co(II), Cd(II), Cu(II) and Zn(II). The results obtained from FAAS, elemental analyses, UV-visible spectra, LC-MS and magnetic susceptibility measurements confirmed the tetrahedral environment for [CdLCl] complex and octahedral environment around copper(II), cobalt(II) and nickel(II) complexes. The time and mole ratios factors were studied to recommend the optimized conditions of metal complexes formations and the observed data was investigated for the deprotonation of the azo-dye at pH 6-7.0 with 6.5 minutes as time of reaction to afford the crystalline complexes.
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