Synthesis, crystal structure, DNA interaction and antioxidant activities of two novel water-soluble Cu(2+) complexes derivated from 2-oxo-quinoline-3-carbaldehyde Schiff-bases

Two novel 2-oxo-quinoline-3-carbaldehyde (4′-hydroxybenzoyl) hydrazone, thiosemicarbazone ligands and its corresponding Cu(2+) complexes were synthesized, and the two complexes’ structures were determined by X-ray single crystal diffraction. The interaction of the two Cu(2+) complexes with calf thymus DNA (CT-DNA) was investigated by electronic absorption spectroscopy, fluorescence spectroscopy and viscosity measurement. The experimental evidences indicated that the two water-soluble Cu(2+) complexes could strongly bind to CT-DNA via an intercalation mechanism. The intrinsic binding constants of complexes 1 and 2 with CT-DNA were 7.31 × 106 and 2.33 × 106 M−1, respectively. Furthermore, the antioxidant activities (hydroxyl radical and superoxide) of the two water-soluble metal complexes were determined by hydroxyl radical and superoxide scavenging method in vitro.

Graphical abstractTwo novel Schiff-bases ligands, 2-oxo-quinoline-3-carbaldehyde (4′-hydroxybenzoyl) hydrazone, thiosemicarbazone, and its Cu(2+) complexes were synthesized and their DNA-binding abilities, antioxidant activities were investigated in detail.Figure optionsDownload full-size imageDownload as PowerPoint slide