Fluorescence chemosensor for fluoride ion using quinoline-derived probe: Molecular logic gate application

Here, we tested the existing cadmium probe (P) that could be used for the fluorescent detection of fluoride ions selectively over other anions. The strong emission was scrutinized at 500 nm for fluoride ions by P and concluded that it was caused by the hydrogen bonding interaction proceeded by deprotonation. As per Job's graph, the binding stoichiometric ratio between P and fluoride ion is 1:1 which has been confirmed by H-1 NMR titration, MS, and density functional theory studies (DFT). The detection limit for fluoride ion is 0.128 mu M based on the concentration-reliant fluorescence titration. According to the findings, the probe is a strong contender for fluoride ion recognition. Further, P was also beneficial in the molecular logic gate and real water samples.

Automated summary

In this study, we tested an existing cadmium probe (P) for the selective fluorescent detection of fluoride ions. The strong emission at 500 nm for fluoride ions was found to be caused by hydrogen bonding interaction. The binding stoichiometric ratio between P and fluoride ion was confirmed to be 1:1, and the probe showed a low detection limit for fluoride ion. These results suggest that P is a strong contender for fluoride ion recognition and has potential applications in molecular logic gates and real water samples.