title: Synthesis, double stranded DNA-binding and photocleavage studies of a functionalized ruthenium(II) complex with 7,7'-methylenedioxyphenyldipyrido[3,2-a:2',3'-c]-phenazine.
abstract: A new Ru(II) complex [Ru(phen)(2)(mdpz)](2+) (phen=1,10-phenanthroline, mdpz=7,7'-methylenedioxyphenyl-dipyrido-[3,2-a:2',3'-c]phenazine) has been synthesized and characterized in detail by elemental analysis, mass spectrometry and (1)H NMR spectroscopy. The interaction of the complex with calf thymus DNA was investigated by spectroscopic and viscosity measurements. The results suggest that the complex binds to DNA via an intercalative mode and serves as a molecular "light switch" for DNA. Moreover, the complex has been found to promote the photocleavage of plasmid DNA pBR322 under irradiation at 365 nm. The mechanism studies reveal that singlet oxygen ((1)O(2)) plays a significant role in the photocleavage.
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: Xi-Ling
authors.initials: XL
authors.lastname: Liang
authors.forename: Xiao-Hua
authors.initials: XH
authors.lastname: Liu
mesh_terms: D004247:DNA / Q000737:chemistry / Q000187:drug effects / Q000528:radiation effects; D053837:DNA Cleavage; D015342:DNA Probes / Q000138:chemical synthesis / Q000737:chemistry*; D049449:Luminescence; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: C539777:(7,7'-methylenedioxyphenyl-dipyrido-(3,2-a-2',3'-c)phenazine)bis(1,10-phenanthroline)rithenium(II); D015342:DNA Probes; D009942:Organometallic Compounds; D004247:DNA; C427203:calf thymus DNA