Abstract
A highly selective fluorescent chemosensor was designed, synthesized, and evaluated for Zn2+ recognition based on the photoinduced electron transfer (PET) mechanism. This azofluorescein was comprised of a fluorescein moiety acting as a fluorophore, a linker (NN) and a novel ionophore receptor generated by the coordination of the linker (NN) with phenoxyl and carboxyl functionalities to render a binding pocket for Zn2+ recognition. In the presence of Zn2+, a marked enhanced fluorescence change of 10-fold was observed. Under optimized conditions, a linear relationship between the fluorescence intensity and concentration of Zn2+ was observed with a detection limit of 1.2μM. This probe also exhibited selectivity for Zn2+ over other metals ions, especially Cd2+. The binding constant of the Zn2+–azofluorescein complex was determined to be 2.4×104M−1.
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