title: Photoluminescence quenching of [Ru(bpy)2(atatp)](2+) bound to a condensed DNA matrix.
abstract: A novel [Ru(bpy)2(atatp)](2+) (bpy=2,2'-bipyridine and atatp=acenaphtheno[1,2-b]-1,4,8,9-tetraazatriphenylene) can induce the condensation of herring sperm DNA to form an orange-red cast film via intercalation and electrostatic attraction. The thus-prepared cast film shows microsecond emission lifetimes and reversible luminescence tuning characteristics by oxygen and nitrogen with an on-off emission intensity ratio of 4.3. The photoluminescence of [Ru(bpy)2(atatp)](2+) bound to a DNA condensed matrix can be quenched by water, dissolved oxygen, copper(II) and ferrocyanide ions. The DNA binding is found to hardly alter the dynamic quenching of [Ru(bpy)2(atatp)](2+) by oxygen at a low DNA-to-Ru(II) molar ratio (r=0.83), allowing [Ru(bpy)2(atatp)](2+) to keep a basically unchanged oxygen quenching constant, as well as endow the photo-induced electron transfer between [Ru(bpy)2(atatp)](2+) and copper(II) cations, and weaken the electrostatic attraction of [Ru(bpy)2(atatp)](2+) with ferrocyanide anions. In addition, the DNA condensation induced by [Ru(bpy)2(atatp)](2+) can protect the DNA oxidative damage against superoxide anion and hydroxyl radical toxicity. The present results could provide a versatile platform for better fabrication of optoelectronic devices.
authors.affiliation: Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China.
authors.forename: Linlin
authors.initials: L
authors.lastname: Chen
authors.affiliation: Department of Chemistry, Sun Yat-Sen University, Guangzhou 510275, PR China.
authors.forename: Hui
authors.initials: H
authors.lastname: Chao
authors.affiliation: Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China.
authors.forename: Qianwen
authors.initials: Q
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China.
authors.forename: Xuling
authors.initials: X
authors.lastname: Zheng
authors.affiliation: Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education, School of Chemistry and Environment, South China Normal University, Guangzhou 510006, PR China. Electronic address: lihong@scnu.edu.cn.
authors.forename: Hong
authors.initials: H
authors.lastname: Li
mesh_terms: D015082:2,2'-Dipyridyl / Q000031:analogs & derivatives* / Q000737:chemistry; D000073:Acenaphthenes / Q000737:chemistry*; D000818:Animals; D004247:DNA / Q000737:chemistry*; D005399:Fishes; D016166:Free Radical Scavengers / Q000737:chemistry; D007364:Intercalating Agents / Q000737:chemistry*; D049449:Luminescence; D009942:Organometallic Compounds / Q000737:chemistry*; D010618:Phenanthrolines / Q000737:chemistry*; D026082:Singlet Oxygen / Q000737:chemistry
chemical_list: D000073:Acenaphthenes; D016166:Free Radical Scavengers; D007364:Intercalating Agents; D009942:Organometallic Compounds; D010618:Phenanthrolines; C415335:acenaphtheno(1,2-b)-1,4,8,9-tetraazatriphenylene; C103599:bis(bipyridyl)ruthenium(II); D026082:Singlet Oxygen; D015082:2,2'-Dipyridyl; D004247:DNA
keywords: DNA condensation; Luminescence quenching; Optical sensor; Polypyridyl ruthenium(II) complex