A Highly Selective Fluorescent Chemosensor for Pb 2+
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Abstract
A new fluorescent sensor based on rhodamine B for Pb2+ was synthesized. The new fluorescent sensor showed an extreme selectivity for Pb2+ over other metal ions examined in acetonitrile. Upon the addition of Pb2+, an overall emission change of 100-fold was observed, and the selectivity was calculated to be 200 times that of Zn2+. The signal transduction occurs via of reversible CHEF (chelation-enhanced fluorescence) with this inherent quenching metal ion.
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7Topics & keywords
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Keywords
- Chemistry
- Fluorescence
- Selectivity
- Metal ions in aqueous solution
- Acetonitrile
- Photochemistry
- Quenching (fluorescence)
- Chelation
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