Department of Chemistry, Hindusthan College of Engineering and Technology, Coimbatore-641 032, Tamilnadu, India E-mail : drarunachalam.s@gmail.com Manuscript received online 24 January 2013, accepted 08 April 2013 Diamagnetic ruthenium(II) complexes of the type [RuCl(CO)(pyridine)(L)] (where L = monobasic tridentate Schiff base ligands ) were synthesized by the reactions of Schiff bases derived from the reactions of o-aminobenzoic acid and Knovenegal condensate of ß-ketoesters and appropriate

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... thenium metal precursor [RuHCl(CO)(PPh3)2(py)]. Elemental analyses and spectral (FT-IR, UV-Vis and 1H, 31P NMR) studies of all the new synthesized complexes suggest the presence of an octahedral environment around the RuII ion. Cyclic voltammograms of all the complexes display oxidation and reduction potentials. Superoxide dismutase activity (SOD) of these complexes has also been examined. These complexes were also subjected to study their biocidal activity against Staphylococcus epidermidis, Escherichia coli, Botrytis cinerea and Aspergillus niger.