Charge Transfer and Photoluminescence Properties of Hetero- and Homo-Bimetallic Complexes of Ni(II) and Cu(II)-4,5-bis(benzimidazol-2-yl)imidazole

Dr. Irshad Ali^1*, Dr. Shamshad Ahmad Khan^2 
1Assistant Professor, Department of Chemistry, B.N College, Patna University, Patna, India
²Assistant Professor, PG Dept Of Chemistry, D.A.V College, Siwan, J.P. University, Chhapra

Abstract
A number of hetero-bimetallic and homo-bimetallic complexes of Ni(II) and Cu(II) of  composition [M(imbz)₂ CuCl₂] and [(M(imbz)₂ NiCl₂ (bipy)] [M= Ni̎II or CuII, Himbz = 4,5-bis(benzimidazol-2-yl) imidazole and bipy = 2, 2-bipyridine] have been prepared and characterized. The absorption spectra, magnetic susceptibility, redox behavior and photoluminescence properties of the complexes have been examined thoroughly. Electronic absorption band positions and magnetic moment values of complexes are consistent with octahedral structure of metal ions.
Key words: Photoluminescence and metal ligand charge transfer, bimetallic 4,5–bis (benzimidazol-2-yl) imidazole complexes.