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Transition metal complexes with oxygen donor ligands: a synthesis, spectral, thermal and antimicrobial study

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Author(s): VAIBHAV N. PATANGE | RAJENDRA K. PARDESHI | BALASAHEB R. ARBAD

Journal: Journal of the Serbian Chemical Society
ISSN 0352-5139

Volume: 73;
Issue: 11;
Start page: 1073;
Date: 2008;
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Keywords: dehydroacetic acid | chalcones | thermal study | ligand field parameters | antimicrobial study

ABSTRACT
Transition metal complexes of chalcones derived from the conden¬sation of 3-acetyl-6-methyl-2H-pyran-2,4(3H)-dione (dehydroacetic acid) and p-methoxybenzaldehyde (HL1) or p-nitrobenzaldehyde (HL2) were synthesized and characterized by elemental analysis, conductometry, thermal analysis, magnetic measurements, IR, 1H-NMR, UV–Vis spectroscopy and a microbial study. From the analytical and thermal data, the stoichiometry of the complexes was found to be 1:2 (metal:ligand). The molar conductance data revealed that all the metal chelates were non-electrolytes. The thermal stability of the complexes was studied by thermogravimetry and the decomposition schemes of the complexes are given. The ligands and their metal complexes were screened for antibacterial activity against Staphylococcus aureus and Escherichia coli, and fungicidal activity against Aspergillus flavus, Curvularia lunata and Penicillium notatum.
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