Radical scavenging mediating reversible fluorescence quenching of an anionic conjugated polymer: Highly sensitive probe for antioxidants

doi:10.1021/cm060062+

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	Radical scavenging mediating reversible fluorescence quenching of an anionic conjugated polymer: Highly sensitive probe for antioxidants
	Tang, Yanli; He, Fang; Yu, Minghui; Wang, Shu; Li, Yuliang; Zhu, Daoben
刊名	CHEMISTRY OF MATERIALS
	2006-08-08
卷号	18 期号:16 页码:3605-3610
ISSN号	0897-4756
DOI	10.1021/cm060062+
英文摘要	The anionic conjugated polymer poly {1,4- phenylene[ 9,9- bis(4-phenoxybutylsulfonate)] fluorene-2,7-diyl} (PFP-SO3-) can form a complex with cationic quencher 4-(trimethylammonium)-2,2,6,6-tetramethylpiperidine- 1-oxyl iodide (CAT1) through electrostatic interactions. The fluorescence of PFP-SO3- is efficiently quenched by CAT1 with a Stern-Volmer constant (K-sv) of 2.3 x 10(7) M-1. The dynamic quenching rate constant of 8.85 x 10(16) M-1 s(-1) shows that the static quenching, as supported by PFP-SO3-/CAT1 charge pairing, is the dominant quenching mechanism. Either by hydrogen abstraction, or by reduction, the transformation of the paramagnetic nitroxide radical into diamagnetic hydroxylamine inhibits the quenching, and therefore, the fluorescence of anionic conjugated polymer is recovered. The fluorescence recovery can be used to probe the processes of hydrogen transfer reaction from antioxidants to radicals and the reduction of radical by antioxidants. These assays benefit from the sensitivity of optical signals from conjugated polymers. The PFP-SO3-/CAT1 assembly can also be used as a platform to sense ascorbic acid in water with high selectivity and sensitivity.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000239396900005
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/58087]
专题	中国科学院化学研究所
通讯作者	Wang, Shu
作者单位	Chinese Acad Sci, Inst Chem, Key Lab Organ Solids, Beijing Natl Lab Mol Sci, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Tang, Yanli,He, Fang,Yu, Minghui,et al. Radical scavenging mediating reversible fluorescence quenching of an anionic conjugated polymer: Highly sensitive probe for antioxidants[J]. CHEMISTRY OF MATERIALS,2006,18(16):3605-3610.
APA	Tang, Yanli,He, Fang,Yu, Minghui,Wang, Shu,Li, Yuliang,&Zhu, Daoben.(2006).Radical scavenging mediating reversible fluorescence quenching of an anionic conjugated polymer: Highly sensitive probe for antioxidants.CHEMISTRY OF MATERIALS,18(16),3605-3610.
MLA	Tang, Yanli,et al."Radical scavenging mediating reversible fluorescence quenching of an anionic conjugated polymer: Highly sensitive probe for antioxidants".CHEMISTRY OF MATERIALS 18.16(2006):3605-3610.