The solid complexes of Mn II , Fe III , Co II , Ni II and Cu II with 3-(3-furan-2yl-acryloyl)-6-methyl-pyran-2,4-dione(L 1 ) and 3-(3-thiophene-2yl-acryloyl)-6-methyl-pyran-2,4-dione (L 2 ) have been synthesized and characterized by elemental analysis, conductometry, thermal analysis, magnetic, i.r., P-n.m.r., u.v.-vis, X-ray diffraction and antimicrobial study. From the analytical and spectral data, the stoichiometry of the complexes has been found to be 1:2 (metal:ligand). I.r. spectral data suggest that the ligand behaves as a dibasic bidentate ligand with O:O donor sequence towards metal ions. The physico-chemical data suggests distorted octahedral geometry for Cu II complexes and octahedral geometry for all other complexes. The X-ray diffraction suggests an Orthorhombic crystal system for the Cu II complex and Monoclinic crystal system for Co II and Ni II complexes of ligand L 1 . The ligands and their metal complexes were screened for antibacterial activity against Staphylococcus aureus and Escherichia coli, and the fungicidal activity against Aspergillus flavus, Curvularia lunata and Penicillium notatum.

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