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Non‐Ionic Water‐Soluble Crown‐Ether‐Substituted Polyfluorene as Fluorescent Probe for Lead Ion Assays
Author(s) -
Yu Minghui,
He Fang,
Tang Yanli,
Wang Shu,
Li Yuliang,
Zhu Daoben
Publication year - 2007
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200700187
Subject(s) - polyfluorene , fluorescence , metal ions in aqueous solution , crown ether , ionic bonding , ion , chemistry , quenching (fluorescence) , ether , polymer , photochemistry , inorganic chemistry , conjugated system , polymer chemistry , organic chemistry , physics , quantum mechanics
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.