Abstract
The Schiff base 1-(3,4-dihydroxybenzylidene)thiosemicarbazide, and its nickel(II) and iron(II) complexes have been prepared using 1:1 and 1:2 metal-to-ligand reactant ratios, and have been characterized by elemental analysis, molar conductance, i.r. and u.v. spectral studies. The 1H-n.m.r. and m.s. spectra of the Schiff base was also recorded. Mo¨ssbauer spectra has been used to identify the electronic states of iron(II) in the ferrous complexes. The compositions, coordination states and possible structures of these complexes are given. Biological activity tests show that the complexes exhibit strong superoxygen dismutase activity and inhibitory actions towards Escherichia coli, Bacillus subtilis, Staphylococcus aureus and Cryptococcus neoforms.
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