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http://dx.doi.org/10.5012/jkcs.2009.53.4.407

Synthesis and Characterization of Some Transition Metal Complexes of Unsymmetrical Tetradentate Schiff Base Ligand  

Munde, A. S. (Department of Chemistry, Milind College of Science)
Jagdale, A. N. (Department of Chemistry, D. P. College)
Jadhav, S. M. (Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University)
Chondhekar, T. K. (Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University)
Publication Information
Journal of the Korean Chemical Society / v.53, no.4, 2009 , pp. 407-414 More about this Journal
Abstract
The solid complexes of Cu(II), Ni(II), Co(II), Mn(II) and Fe(III) with 4-hydroxy-3-(1-{2-(2-hydroxybenzylidene)- amino phenylimino}-ethyl)-6-methy-pyran-2-one (H2L) derived from o-phenylenediamine, 3-acetyl- 6-methyl-(2H) pyran, 2,4 (3H)-dione (dehydroacetic acid or DHA) and salicylic aldehyde have been synthesized and characterized by elemental analysis, conductometry, magnetic susceptibility, UV-visible, IR, $^1H$-NMR spectra, X-ray diffraction, thermal analysis, and screened for antimicrobial activity. The IR spectral data suggest that the ligand behaves as a dibasic tetradentate ligand with ONNO donor atoms sequence towards central metal ion. From the microanalytical data, the stoichiometry of the complexes has been found to be 1:1 (metal: ligand). The physico-chemical data suggests square planar geometry for Cu(II) and Ni(II) complexes and octahedral geometry for Co(II), Mn(II) and Fe(III) complexes. The x-ray differaction data suggests orthorhombic crystal system for Cu(II) complex, monoclinic crystal system for Ni(II), Co(II) and Fe(III) and tetragonal crystal system for Mn(II) complex. Thermal behaviour (TG/DTA) of the complexes was studied and kinetic parameters were determined by Coats-Redfern method. The ligand and their metal complexes were screened for antibacterial activity against Staphylococcus aureus and Escherichia coli and fungicidal activity against Aspergillus Niger and Trichoderma.
Keywords
Dehydroacetic acid; Unsymmetrical tetradentate Schiff Base; Transition metal complexes; Thermal analysis; Powder X-ray diffraction;
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