Abstract: Schiff base has been synthesized by the reaction of salicyladehyde with 2-aminobenzoic acid. The ligand [N-(2- hydroxybenzylidene- 2-aminobenzoic acid)] L₃, and adipic acid dihydrazide L react with Pr(III), Sm(III),  Eu(III), Gd(III), Tb(III), Dy(III) metals to yield ML₃LXn(H₂O)n metal-ligand complexes.where X=Cl^-1, No₃^-2 n=2-7.[N-(2hydroxybenzylidene-2-aminobenzoicacid)] behaves as bidentate  ligand  by coordinating through oxygen atoms and forms five membered chelating ring.Similarly, adipic acid dihydrazide also behaves as bidentate ligand through nitrogen of both amino groups. The IHNMR, IR, UV-Visible and mass spectral studies are made for structural determination. The analytical and mass spectroscopic data reveal that the ligand molecules are bound to metal atom through oxygen and nitrogen and they have 1:3:1 metal:ligands:ligand stoichiometry. The antifungul activities of the mixed metal ligand complexes have been screened in vitro against the organism. A. niger and A. flavus while their antimicrobial activities have also been screend  in the vitro against the organisms S.cocci and E.coli.
 

Keywords  Schif base; [N-(2hydroxybenzylidene-2-aminobenzoicacid)]; adipic acid dihydrazide; Antimicrobial activities.