DNA-binding and Photocleavage Studies of Ethylenediamine Cobalt(III) and Ruthenium(II) Mixed Ligand Complexes

Abstract

,(en=ethylene-diamine, pyip =(pyip = 2-(1-pyrenyl)-1H-imidazo[4,5-f][1,10]phenanthroline),(aip = 2-(9-anthryl)-1H-imidazo[4,5,-f][1,10] phenanthroline) have been synthe-sized and characterized. The interaction of these complexes with calf thymus DNAwas investigated using absorption (UV/vis) and emission spectroscopy, viscositymeasurements as well as DNA melting and plasmid DNA cleavage studies. Theexperimental results show that the four complexes can bind to DNA in an intercala-tion mode. The DNA-binding affinity of complex