Synthesis and Spectroscopic study of some transition metal complexes with 2-(4-Iodo Phenyl Azo)-4,5- Diphenyl Imidazol

This work deals with the preparation and identification of azo dye, 2-(4-Iodo phenyl azo)- 4.5-diphenyl imidazole (4-IPAI).The characterization of this ligand was done by elemental analysis is (C.H.N) mass spectra, Uv-vis. and IR techniques. The complexes of Co(II), Ni(II), and Cu(II) with (4-IPAI) have been prepared. The preparation were performed after fixing the optimum conditions of pH and molar concentration using Uv-Vis spectra of mixed solutions of the above ions with (4-IPAI). A wide range of pH and molar concentration in the ranges obeyed Lambert-Beers law were studies, and the stability (stability constant) were studied at optimum conditions of pH, molar concentration and mole ratio for all complex. The structure of these complexes were deduced according to the mole ratio method which were obtained from the spectroscopic studies of the complex solutions of the above ions. However ratio 1:2 metal: ligand were obtained. Uv-Vis absorption spectra of ethanol solution of the studied complexes showed bathochromic shift in the visible region compared with that of the ligand. The IR. Spectra of these complexes showed some changes in the band shape and density compared with those of the free ligands. New bands have been observed which may indicate that the coordinated with the metal ions. The elemental analysis (C.H.N) agreed with our results, the flame atomic absorption spectroscopy has also been used to determine the metal ion percentages. The percentages of metal ions were determined using flame atomic absorption spectroscopy, good agreement were obtained between the found and calculated percent values. Conductivity measurements have shown non-ionic character of complexes in ethanol and DMF solution. From all above observations the proposed geometrical structures of these complexes were octahedral [M(4-IPAI) 2 Cl 2 ].