Hydrazine bridged coumarin-pyrimidine conjugate as a highly selective and sensitive Zn2 sensor: Spectroscopic unraveling of sensing mechanism with practical application

International audienceWe report the synthesis and Zn2 sensing of a novel coumarin-hydrazine conjugate 3-{1-[(4, 6-Dimethyl-pyrimidin-2-yl)-hydrazono]-ethyl}-chromen-2-one (3). Compound 3 can act as a neat fluorescent Zn2 sensor by an increment in fluorescence intensity along with an appreciable red shift. Fluorescence enhancement is caused by complexation through cis-trans isomerization process in the presence of Zn2 ion. The practical utility of 3 was demonstrated by successful test kit experiment to detect Zn2 in water under UV-light