DNA interaction, superoxide scavenging and cytotoxicity studies on new copper(II) complexes derived from a tridentate ligand
摘要:
The copper complexes [Cu(Pyimpy)(H2O)](ClO4)(2) (1), [Cu(Pyimpy)(2)](ClO4)(2) (2), [Cu(Pyimpy)(2)](Cl)(2)]center dot 2H(2)O(3 center dot 2H(2)O), [Cu(Pyimpy)(N-3)(ClO4)](2) (4) and [Cu(Pyimpy)(SCN)(ClO4)](2) (5) were synthesized and characterized by spectroscopic techniques, crystal structures and electrochemical studies (Pyimpy: (2-((2-phenyl-2-(pyridin-2-l)hydrazono)methyl)pyridine)). The superoxide scavenging activity of the two water soluble complexes 1 and 3 was examined. DNA interaction studies by UV-Vis absorption spectral changes during a titration experiment indicated the generation of new species. These small molecule SOD mimics exhibited excellent DNA cleavage activity in the presence of H2O2 as well as 2-mercaptoethanol. Complexes 1-5 exhibited better cytotoxicity compared to CuCl2 center dot 2H(2)O and the ligand Pyimpy, and showed more potency than cisplatin for MCF-7, PC-3 and HEK-293 cells. Complex 3 exhibited the highest potency for MCF-7, PC-3 and HEK-293 cells compared to the other complexes. (C) 2011 Elsevier Ltd. All rights reserved.