A coumarin based Schiff Base: An effective colorimetric sensor for selective detection of F– ion in real samples and DFT studies

Abstract

Chemosensors are molecular devices which react with target and give a visible signal, which is a degree of its sensitivity. Herein, a novel coumarin based Schiff Base has been synthesized for F– ions detection. The chemosensor showed an intense color change upon the addition of F– ions (light yellow to purple). The chemosensor has fewer effects of competing anions. The limit of detection is calculated as low as 1.1 × 10–6 and the binding constant was determined as 1.61 × 104. The job’s plot confirmed 1:1 stoichiometry between chemosensor and F– ion. The reverse reaction of chemosensor with MeOH is useful to construct a combinatorial logic circuit gates. The interaction mechanism of chemosensor was deliberated by 1H NMR, FTIR, and DFT studies. Finally, the chemosensor was useful to detect F– ions in tooth-paste sample and test strip is prepared for F– ions detection.