A highly selective chemosensor for colorimetric detection of Fe3+ and fluorescence turn-on response of Zn2+

A simple cation sensor bearing naphthol O–H and imine group was designed and synthesized, which showed both colorimetric detection for Fe3+ and fluorescence turn-on response for Zn2+. Meanwhile the distinct color change and the rapid enhancement of fluorescence emission provide naked eyes detections. Moreover, the sensing of Zn2+ was found to be reversible, with the Zn2+-induced emission spectra being quenched upon addition of EDTA. Even more important, this sensor provides a novel approach for selectively recognizing the most important two trace elements at the same time, for Fe3+ by UV–vis spectra and Zn2+ by emission spectra.

A novel chemosensor L based on simple Schiff base is designed and synthesized, the sensor not only shows colorimetric, selective recognition for Fe3+ but also shows OFF–ON fluorescent selectivity for Zn2+ in DMSO. Also the sensing of Zn2+ found to be reversible, with the Zn2+-induced emission spectra being quenched upon addition of EDTA. This work provides a novel approach for selectively recognizing the most important two trace elements at the same time.Figure optionsDownload as PowerPoint slideHighlights
► L shows both colorimetric detection for Fe3+ and fluorescence response for Zn2+.
► Sensor L was designed with ease of synthesis and low cost.
►  L has good selectivity to Fe3+ and Zn2+.
► The sensing of Zn2+ was reversible upon addition of EDTA.