Abstract
Schiff base was prepared via condensation of ethanedihydrazide with 2-hydroxy benzaldehyde and further this monomeric Schiff base polymerize with formaldehyde and barbituric acid and form polymeric Schiff base (PLSB) ligand. The ligand and its polymer metal complexes were characterized by using elemental analysis, IR, UV–VIS, 1HNMR, magnetic susceptibility and thermogravimetric studies. On basis of elemental analysis and spectral studies, six coordinated geometry was assigned for Mn(II), Co(II) and Ni(II) complexes and four coordinated for Cu(II) and Zn(II) complexes. PLSB act as a tetradentate and coordinate through the azomethine nitrogen and phenolic oxygen. The thermal behavior of these polymer metal complexes showed that the hydrated complexes losses water molecules of hydration in the first step followed immediately by decomposition of the anions and ligand molecules in the subsequent steps. The (PLSB) ligands and its polymer metal complexes were screened against bacterial species Escherichia coli, Staphylococcus aureus, Bacillus subtilis and fungal species Aspergillus flavus, Candida albicans, A. niger. The activity data show that the metal complexes were more potent than the parent Schiff bases.
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S. A. Khan is thankful to UGC (New Delhi, India) for financial assistance. The authors express their sincere thanks to The Third World Academy of Sciences, Italy for UV-Visible spectrophotometer EZ-201 (PerkinElmer) through research grant scheme No. 00-047 RG/CHE/AS.
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Nishat, N., Khan, S.A., Rasool, R. et al. Synthesis and Characterization of Thermally Stable and Biologically Active Metal-Based Schiff Base Polymer. J Inorg Organomet Polym 22, 455–463 (2012). https://doi.org/10.1007/s10904-011-9592-5
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DOI: https://doi.org/10.1007/s10904-011-9592-5