DNA-BINDING AND CLEAVAGE STUDIES OF Mn(II) AND Co(II) COMPLEXES OF 1-(2,5-DIOXOPYRROLIDIN-1-YL)(4-HYDROXY PHENYL) METHYL) THIOUREA)

A novel Mannich base ligand 1-(2,5-dioxopyrrolidin-1-yl) (4-hydroxy phenyl) methyl) thiourea (PSTU) and its Manganese (II) and Cobalt (II) complexes have been synthesized and characterized by elemental analysis, molar conductance measurements, magnetic susceptibility measurements, FT-IR, H-1 NMR and C-13 NMR spectroscopic studies. The antimicrobial activities and antioxidant activities of the free ligand and its metal complexes were also performed. The results revealed enhanced antimicrobial activities against Bacillus subtilis (gram+ive) and Escherichia coli (gram-ive bacteria) and also significant antioxidant activity. In addition, DNA binding properties of the ligand and its metal complexes have been investigated by UV-Visible absorption spectroscopy, viscosity measurements, emission spectra and gel electrophoresis, which suggest that the metal complexes act as efficient DNA binders. The results shown that the nuclease activity Co(II) complex was effective which could induce scission of pBr322 super coiled DNA effectively to linear form in presence of H2O2 as oxidizing agent.