The reaction between 1-(1H-benzo[d]imidazol-1-yl)-2-chloroethanone with aniline gives 2-(4-aminophenyl)-1-(1Hbenzo[ d]imidazol-1-yl)ethanone(BI), The diazotion of 2-(4-aminophenyl)-1-(1H-benzo[d]imidazol-1- yl)ethanone(BI) couple with salicylic acid,they afford the ligand compound and named as 5-((4-(2-(1Hbenzo[ d]imidazol-1-yl)-2-oxoethyl)phenyl)diazenyl)-2-hydroxybenzoic acid(BIASA). The transition metal complexes of Cu2+, Co2+ ,Ni2+, Mn2+ and Zn2+ of BIASA have been prepared and characterized by elemental analyses, spectral studies, magnetic moment determination, molar conductivity measurement and microbicidal activity.