Novel Nitrogen Hybrid F− Sensors Based on ESIPT Mechanism Achieving Super Low Detection Limits

ABSTRACT Two novel nitrogen hybrid fluorescent sensors based on the ESIPT mechanism were successfully synthesized for the detection of fluoride ions (F − ), and they exhibit high sensitivity and selectivity with a fast response. The detection limits even reach the parts per billion level. With the addition of F − , both sensors showed a ratiometric fluorescence change with a large Stokes shift. According to the hydrogen‐1 ( 1 H) NMR titration, it was confirmed that the desilication reaction occurred between the sensors and F − . This work provides guidance for the subsequent development of F − fluorescence sensors.