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New imidazole  azo ligand (DPIDA) was prepared by coupling reaction between 4,5-di phenyl imidazole and N1,N1-dimethylbenzene1,4-diamine di hydrochloride  and studied the complexation of this ligand with Mn(II) , Co(II) , Ni(II) , Cu(II) , Zn(II) , Cd(II) , and Hg(II)  ions , The free ligand and it’s complexes  characterized by Mass, 1HNMR, IR, UV-Vis. ,  and molar conductivity that indicated the octahedral geometry of them with a bidentate ligand which coordinated from (N3) atom of imidazole ring and one nitrogen atom of azo group.Biological activity of ligand (DPIDA) and it's complexes tested against two multi-drug resistant aerobic pathogenic bacteria isolated from patients with a burn. Three concentrations were selected (50, 100, 150) mg/ml for each crud synthesized derivative compounds. The derivative compound (4,5-diphenyl imidazole) with concentration 150mg/ml had an excellent antibacterial effect against Staphylococcus aureus and Pseudomonas aeruginosa with inhibition zone 21.83 ± 0.1764 mm and 24.30 ± 0.4163 mm respectively.

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