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Updated: Aug 4, 2026

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
Published on: March 13, 2013
A coumarin based Schiff Base: An effective colorimetric sensor for selective detection of F- ion in real samples and
Nadeem Ahmed1, Wajeeha Zareen2, Zahid Shafiq2
1Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
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.
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