Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5187156 | Polymer | 2008 | 6 Pages |
Abstract
A series of water-soluble cationic polyfluorene copolymer containing 2,2â²-bipyridine moieties (PFP-P1-3) in the backbone were designed and synthesized as the fluorescent probes for Cu2+ ions. In the absence of the Cu2+ ion, the PFP-P2 exhibits strong fluorescence emission in aqueous solution. Upon adding the Cu2+ ion, the PFP-P2 coordinates to Cu2+ ions through weak Nâ¯Cu interactions, and its fluorescence is efficiently quenched by the Cu2+ ion with a Stern-Volmer constant (Ksv) of 1.44 Ã 107 Mâ1. The new method has high sensitivity with a detection limit of 20 nM. The minor interference from other heavy metal ions clearly shows that the PFP-P2 can be used as the Cu2+ ion probe with good selectivity.
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Authors
Chengfen Xing, Zhiqiang Shi, Minghui Yu, Shu Wang,