An efficient long fluorescence lifetime polymer-based sensor based on europium complex as chromophore for the specific detection of F−, CH3COO−, and H2PO4−
An efficient long fluorescence lifetime polymer-based sensor based on europium complex as chromophore for the specific detection of F−, CH3COO−, and H2PO4−
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DOI：
10.1039/c2py20408h
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发表时间：
2012-07
影响因子：
4.6
通讯作者：
Chaolong Yang;Jing Xu;Jianying Ma;Dongyu Zhu;Yunfei Zhang;Liyan Liang;Mangeng Lu
中科院分区：
文献类型：
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作者：
Chaolong Yang;Jing Xu;Jianying Ma;Dongyu Zhu;Yunfei Zhang;Liyan Liang;Mangeng Lu
通过经典的自由基共聚反应，设计并合成了一种新型的长荧光寿命铕络合共聚物（Eu-polymer），作为F−、CH3COO−和H2PO4−的高效荧光传感器。用一系列阴离子在DMSO溶液中评价了铕聚合物的阴离子敏感性。在与F−、CH3COO−或H2PO4−结合时，铕聚合物的荧光猝灭，荧光强度降低约95%，而在其他阴离子存在时则没有明显的荧光变化。与小分子聚合物相比，铕聚合物具有更高的灵敏度和选择性。最重要的是，即使在竞争阴离子（如CH3COO−和H2PO4−）存在的情况下，铕聚合物传感器也能有效地识别和检测F−，这证明了铕聚合物作为F−的选择性荧光传感器的能力。荧光猝灭可归因于阴离子与铕的咪唑基团之间的强氢键相互作用（以及高浓度F−的去质子相互作用）。由于该铕聚合物具有较长的荧光寿命，能够有效地消除自身荧光和周围生物环境光散射的影响，因此该传感器在生物和环境领域的应用具有重要意义。
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.