荧光
铕
发色团
聚合物
光化学
化学
脱质子化
猝灭(荧光)
共聚物
选择性
催化作用
离子
有机化学
物理
量子力学
作者
Chaolong Yang,Jing Xu,Jianying Ma,Dongyu Zhu,Yunfei Zhang,Liyan Liang,Mangeng Lu
出处
期刊:Polymer Chemistry
[The Royal Society of Chemistry]
日期:2012-01-01
卷期号:3 (9): 2640-2640
被引量:60
摘要
A novel long fluorescence lifetime europium-complexed copolymer (Eu-polymer) has been designed and synthesized via the classic free radical copolymerization reaction as an efficient fluorescent sensor for F−, CH3COO−, and H2PO4−. The anions-sensitivity of Eu-polymer was evaluated using a series of anions in DMSO solution. On binding to F−, CH3COO−, or H2PO4−, fluorescence quenching of Eu-polymer was demonstrated by an approximately 95% reduction in the fluorescence intensity, while no obvious fluorescence change could be observed in the presence of other anions. Compared with its small molecular counterpart, Eu-polymer exhibits higher sensitivity and selectivity. Most importantly, the Eu-polymer sensor can efficiently recognize and sense F− even in the presence of competitive anions, such as CH3COO− and H2PO4−, which demonstrates the ability of Eu-polymer to function as a selective fluorescence sensor for F−. The fluorescence quenching can be attributed to the strong hydrogen bonding interaction (and deprotonation interaction at high concentration for F−) between anions and the imidazole group of Eu-polymer. Due to the long fluorescence lifetime of this Eu-polymer, it can efficiently eliminate the effects of auto-fluorescence and light scattering from surrounding biological environments, so this sensor will be very significant for application in biological and environmental fields.
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