European Journal of Molecular & Clinical Medicine

Abstract

A Schiff base ligand of N-methyl Thiosemicarbazide and its complexes with Co metal ion
of binary [Co(L)2] (Complex-A), and ternary, formulae [Co(L)(L1)(H2O)] (Complex-B),
[Co(L)(L2)(H2O)] (Complex-C) where L is Schiff base ligand, L1 is Bi-pyridine and L2 is
oxalic acid have been synthesized and the compounds had been characterized based on the
several spectroscopic results. The interaction of these compounds with DNA was
investigated by electronic absorption spectroscopy and fluorescence spectroscopy. Our
experiments indicated that these complexes could strongly bind to CT- DNA via
intercalation mode with Kb values of 1.2 x 104 M-1 to 5.7 x 104 M-1 and the nucleotide
incision against super coiled pBR322 DNA had been investigated by both photolytic and
oxidative techniques to reveal the efficient manner of cleavage by the metal complexes.
Furthermore, these complexes exhibited significant in vitro Cytotoxicity against HeLa &
MCF7 cell lines showing IC50 values around 46.03 to 62.05 μM. Finally, an antimicrobial
assay of these complexes over one gram-positive bacterium of Bacillus Subtilis and one
gram-negative bacterium of Escherichia Coli and also two fungal species had given a good
result.