A newly synthesized hydrazine-functionalized Schiff base chemoreceptor [N¹N³−bis(4-cyanobenzylidene) isophthalahydrazide], NBCBIH has been prepared and successfully utilized for selective detection of Fluoride ion. Herein, NH and C=N-like functional units have been incorporated which providebetter colorimetric response compared to systems where such kind of units are absent. On exposure to F⁻, NBCBIH turns from almost colorless to yellow. The recognition is well-supported by UV-Vis, fluorescence and ¹H-NMR in DMSO. The fluorescence quenching is well-explained by photoinduced electron transfer mechanism (PET). The limit of detection of F− with NBCBIH is 0.7 × 10⁻⁴M.
