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A coumarin-based fluorescent chemosensor for Zn2+ in aqueous ethanol media
Zhuan Su1, Kangyu Chen, Yuan Guo
1Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry, Northwest University, Xi'an, 710069, China.
Abstract:
A coumarin-based fluorescent chemosensor 1 for Zn(2+) was designed and synthesized. Compound 1 exhibits lower background fluorescence due to intramolecular photoinduced electron transfer. However, upon mixing with Zn(2+) in 30% (v/v) aqueous ethanol, a "turn-on" fluorescence emission is observed. The fluorescence emission increases linearly with Zn(2+) concentration in the range 0.5-10 micromol L(-1) with a detection limit of 0.29 micromol L(-1). No remarkable emission enhancement was, however, observed for other metal ions. The proposed chemosensor was applied to the determination of Zn(2+) in water samples with satisfactory results.
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