Non‐Ionic Water‐Soluble Crown‐Ether‐Substituted Polyfluorene as Fluorescent Probe for Lead Ion Assays
Non‐Ionic Water‐Soluble Crown‐Ether‐Substituted Polyfluorene as Fluorescent Probe for Lead Ion Assays
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DOI：
10.1002/marc.200700187
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发表时间：
2007-06
影响因子：
4.6
通讯作者：
Minghui Yu;F. He;Yanli Tang;Shu Wang;Yuliang Li;Daoben Zhu
中科院分区：
文献类型：
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作者：
Minghui Yu;F. He;Yanli Tang;Shu Wang;Yuliang Li;Daoben Zhu
合成并表征了一种每个重复单元含有两个苯并-18-冠-6侧链的新型非离子水溶性聚荧烯。在PFDC溶液中加入Pb2+离子后，PFDC的荧光被强烈猝灭。其他金属离子，特别是Cu2+和Hg2+离子的干扰很小，表明该方法可用于高选择性的Pb2+离子的检测。PFDC在溶液中的荧光猝灭来源于冠醚部分与Pb2+离子的多价配位作用，并伴随着沉淀作用。与离子共轭聚合物相比，介质的pH对非离子PFDC与Pb2+离子结合的影响较小。
A new non-ionic water-soluble polyfluorene that contains two benzo-18-crown-6 side chains per repeat unit (PFDC) is synthesized and characterized. Upon addition of Pb 2+ ions to a solution of PFDC, the PFDC fluorescence is strongly quenched. The minor interference from other metal ions, especial from Cu 2+ and Hg 2+ ions, clearly shows that the PFDC can be used to detect Pb 2+ ions with high selectivity. The fluorescence quenching of PFDC in solution originates from the multivalent coordination of the crown-ether moieties to Pb 2+ ions followed by precipitation. In comparison to ionic conjugated polymers, the pH of the medium shows less effect on the binding of non-ionic PFDC to Pb 2+ ions.