title: Synthesis, DNA-binding and photocleavage studies of ruthenium(II) complex with 2-(3'-phenoxyphenyl)imidazo[4,5-f][1,10]phenanthroline.
abstract: A new polypyridyl ligand MPPIP {MPPIP=2-(3'-phenoxyphenyl)imidazo[4,5-f]-[1,10]phenanthroline} and its ruthenium(II) complexes, [Ru(bpy)(2)MPPIP](2+) (1) (bpy=2,2'-bipyridine) and [Ru(phen)(2)MPPIP](2+) (2) (phen=1,10-phenanthroline) have been synthesized and characterized. The binding of the two complexes to calf thymus DNA (CT-DNA) has been investigated with spectrophotometric methods, viscosity measurements, as well as equilibrium dialysis and circular dichroism spectroscopy. The results suggest that both complexes bind to CT-DNA through intercalation, and enantioselectively interact with CT-DNA in a way. However, complex 2 is a much better candidate as an enantioselective binder to CT-DNA than complex 1. When irradiated at 365nm, both complexes have also been found to promote the photocleavage of plasmid pBR322 DNA.
authors.affiliation: College of Chemistry, Xiangtan University, Xiangtan 411105, PR China. lfwyxh@yahoo.com.cn
authors.forename: Li-Feng
authors.initials: LF
authors.lastname: Tan
authors.forename: Xiao-Hua
authors.initials: XH
authors.lastname: Liu
authors.forename: Hui
authors.initials: H
authors.lastname: Chao
authors.forename: Liang-Nian
authors.initials: LN
authors.lastname: Ji
mesh_terms: D007093:Imidazoles / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D010618:Phenanthrolines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D010777:Photochemistry; D012428:Ruthenium / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013056:Spectrophotometry, Ultraviolet
chemical_list: C518373:2-(3'-phenoxyphenyl)imidazo(4,5-f)(1,10)phenanthroline; D007093:Imidazoles; D010618:Phenanthrolines; D012428:Ruthenium