Abstract
A pyrene-functional fluoroionophore, 1 was used to construct a supramolecular 1/γ-CD complex for Cu 2+ recognition in water. In aqueous γ-CD solution, 1 exhibits pyrene monomer fluorescence emission at 378 nm and 397 nm, while in the presence of Cu 2+, it shows a pyrene excimer emission at 452 nm with a decrease in the monomer fluorescence due to the formation of a 1:2 metal–liganded complex. Based on the response characteristics of the supramolecular complex, a fluorescent ratiometric method was performed for the determination of Cu 2+ concentration in water. With the optimum conditions described, Cu 2+ in aqueous solution can be determined from 1.2 × 10 −6 to 4.5 × 10 −4 M. The Cu 2+ selectivity of the complex is excellent, and the excimer fluorescence enhancements are very smaller induced by other heavy metal and transition metal ions.
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