Schiff-Based Fluorescent-ON Sensor L Synthesis and Its Application for Selective Determination of Cerium in Aqueous Media

Abstract

In the present study, a fluorescent sensor L for sensing of Ce3+ ion was designed and characterized by XRD, 1HNMR, and FTIR. Its fluorescence behavior towards metal ion was examined by fluorescence spectroscopy. Chelation-enhanced fluorescence was shown by the sensor L upon interaction with Ce3+ ion. This fluorescent sensor exhibits high sensitivity and selectivity towards Ce3+ ion in acetonitrile solution, forming 2 : 1 (L : M) complex as determined by Job’s plot. Association constant was found to be 1×107 M−1 estimated from the Benesi-Hildebrand plot. No significant interference was observed in the presence of other studied alkali, alkaline, and transition metal ions. A rapid response was observed when employed for the determination of Ce3+ ion in spiked water samples with a limit of detection equal to 3.4×10−8 M.

A naphthalene-based azo armed molecular framework for selective sensing of Al3+

“…S3, ESI †). 77 Changes in the aromatic proton position, the upfield shift of the imine proton from 10.00 to 9.75 ppm, and disappearing of the proton of phenyl O-H at 12.50 ppm in the NMR spectra of the complex confirm the adduct formation between the sensor and Al 3+ (Fig. S5, ESI †).…”

Strategies for Improving Selectivity and Sensitivity of Schiff Base Fluorescent Chemosensors for Toxic and Heavy Metals

“…The fluorescence quenching occurs when the Schiff base is exposed to a hazardous cation sample. The presence and concentration of the cation can be determined by monitoring the fluorescence recovery upon chelation or displacement of the hazardous cation [46]. (4) Sensitivity and LOD: Schiff bases can exhibit high sensitivity towards hazardous cations, allowing for their detection at low concentrations.…”