Development of a coumarin-furan conjugate as Zn2+ ratiometric fluorescent probe in ethanol-water system
Abstract In this study, a novel coumarin-derived compound bearing the furan moiety called 7-diethylamino-3-formylcoumarin (2′-furan formyl) hydrazone ( 1 ) has been designed, synthesized and evaluated as a Zn 2+ ratiometric fluorescent probe in ethanol-water system. This probe 1 showed good selectivity and high sensitivity towards Zn 2+ over other metal ions investigated, and a decrease in fluorescence emission intensity at 511nm accompanied by an enhancement in fluorescence emission intensity at 520nm of this probe 1 was observed in the presence of Zn 2+ in ethanol-water (V : V=9 : 1) solution, which provided ratiometric fluorescence detection of Zn 2+ . Additionally, the ratiometric fluorescence response of 1 to Zn 2+ was nearly completed within 0.5min, which suggested that this probe 1 could be utilized for sensing and monitoring Zn 2+ in environmental and biological systems for real-time detection. Highlights A novel coumarin-furan conjugate 1 was designed and synthesized. Ratiometric fluorescence response of 1 to Zn 2+ was observed in ethanol-water system. Good selectivity and high sensitivity of 1 towards Zn 2+ over other metal ions were obtained. Binding mechanism for the response of 1 to Zn 2+ was investigated in detail. Graphical Abstract [DISPLAY OMISSION]
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