SYNTHESIS AND ANTIMICROBIAL STUDY OF METAL COMPLEXES OF SM (III), EU (III) AND ASYMMETRICAL LIGAND DERIVED FROM DEHYDROACETIC ACID

Tetradentate Schiff bases are synthesized from o-phenylenediamine, 5-bromo Salicylaldehyde, and 3-Acetyl-6-methyl-pyran-2, 4-dione, and then its colored complexes of Sm (III) and Eu (III) are formed. The structure of ligand and complexes are characterized by elemental analysis, magnetic susceptibility, thermal analysis, X-ray diffraction, 1H-NMR, mass, IR, UV-visible spectra, and conductometry. TGA/DSC spectral and kinetic parameter of the complexes was studied eagerly. The x-ray diffraction data proposes Tetragonal crystal system for Sm (III) complexes and orthorhombic for Eu (III) complexes. The ligand and their metal complexes were subjected for antibacterial activity against Escherichia coli, Staphylococcus aureus, Pseudomonas Aeruginosa using the agar cup-plate method, and antifungal activity was observed by poison plate method against Aspergillus niger, Aspergillus flavus, Penicillium chrysogenum. The results obtained above are in good agreement with previous findings with respect to the comparative activity of the free ligand and its complexes. The result of an investigation of antimicrobial activity indicates that all the ligands show an inhibitory effect against all the pathogens.