Spectrochemical and theoretical approaches for acylhydrazone-based fluoride sensors

A simple colorimetric and ratiometric fluoride ion probe with large color change

“…The result was similar with those of uoride ion probes based on acylhydrazone skeleton reported previously. [40][41][42][43][44][45] To gain further insight into the observed difference of red shi value of the absorption band between SHJ-1 and SHJ-2 during the uoride ion sensing, the optimized geometries for probes and probes with F À were optimized by DFT calculation using Gaussian 16, respectively. As shown in Fig.…”

“…38 For naked-eye detection, it is signicant to design chemical probes with large color change toward uoride ion sensing. 39 Recently, uoride ion probes based on acylhydrazone derivates have been successfully developed for naked-eyes detection, 40,41 mainly originated from the strong binding between active proton in acylhydrazone moiety and F À , which further induced the deprotonation of the probe and facilitate the p-p* transition in low energy, 42 resulting in a red shi of absorption spectra. 43 The reported uoride ion probes based on acylhydrazone derivates were normally constructed by introducing a non-conjugated acylhydrazone unit among two conjugated moieties.…”