Antimalarial, antimicrobial, cytotoxic, DNA interaction and SOD like activities of tetrahedral copper(II) complexes

• Synthesis of tetrahedral Cu(II) complexes.
• Characterization by elemental, IR, UV–Visible, LC–MS and EPR spectroscopy.
• All Cu(II) complexes have been tested for their biological activities.
• Binding and cleavage efficiency of DNA with complexes have been performed.

The mononuclear copper(II) complexes with P, O-donor ligand and different fluoroquinolones have been synthesized and characterized by elemental analysis, electronic spectra, TGA, EPR, FT-IR and LC–MS spectroscopy. An antimicrobial efficiency of the complexes has been tested against five different microorganisms in terms of minimum inhibitory concentration (MIC) and displays very good antimicrobial activity. The binding strength and binding mode of the complexes with Herring Sperm DNA (HS DNA) have been investigated by absorption titration and viscosity measurement studies. The studies suggest the classical intercalative mode of DNA binding. Gel electrophoresis assay determines the ability of the complexes to cleave the supercoiled form of pUC19 DNA. Synthesized complexes have been tested for their SOD mimic activity using nonenzymatic NBT/NADH/PMS system and found to have good antioxidant activity. All the complexes show good cytotoxic and in vitro antimalarial activities.

Accommodation of the aromatic chromophore of tetrahedral Cu(II) complexes in the DNA base pairs as an intercalative mode of binding.Figure optionsDownload as PowerPoint slide