title: Synthesis, Characterization, DNA Binding, and Photocleavage Activity of Oxorhenium (V) Complexes with alpha-Diimine and Quinoxaline Ligands.
abstract: The complex [ReOCl(3)pq] (1) (where pq = 2-(2'pyridyl)quinoxaline) has been synthesized and fully characterized by UV-Vis, FTIR, 1 and 2D NMR, and cyclic voltammetry (CV). The DNA-binding properties of the complex 1 as well as of the compounds [ReOCl(3)bpy] (2), [ReOCl(3)phen] (3), and pq (4) were investigated by UV-spectrophotometric (melting curves), CV (cyclic voltammetry), and viscosity measurements. Experimental data suggest that complex 1 intercalates into the DNA base pairs. Upon irradiation, complex 1 was found to promote the cleavage of plasmid pBR 322 DNA from supercoiled form I to nicked form II. The mechanism of the DNA cleavage by complex 1 was also investigated.
authors.affiliation: Laboratory of Inorganic Chemistry, Department of Chemistry, University of Athens, Panepistimiopolis, Zografou, Athens 157 71, Greece.
authors.forename: Christiana A
authors.initials: CA
authors.lastname: Mitsopoulou
authors.forename: Constantinos
authors.initials: C
authors.lastname: Dagas