Non-Ionic Water-Soluble Crown-Ether-Substituted Polyfluorene as Fluorescent Probe for Lead Ion Assays
✍ Scribed by Minghui Yu; Fang He; Yanli Tang; Shu Wang; Yuliang Li; Daoben Zhu
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 160 KB
- Volume
- 28
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
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.
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