A Schiff-Based Colorimetric Fluorescent Sensor with the Potential for Detection of Fluoride Ions

Abstract

A simple Schiff-based colorimetric fluorescent receptor 1 was prepared. It exhibits a "turn-on-type" mode with high sensitivity in the presence of F(-). The change in color is very easily observed by the naked eye in the presence of F(-), whereas other anions do not induce such a change. Job plot indicated a 1:2 complexation stoichiometry between receptor 1 and F(-). The association constant for 1-F(-) in CH3CN was determined as 1.32*10(5) M(-2) by a Hill plot.

Effective Detection of Phenylalanine Using Pyridine Based Sensor

“…(Fig. 8 and 9) [30,31] Literature report for phenylalanine sensor: The experimental nding of pyridine based organic probe detect the PA at lower concentration were further explored using DFT atomic level simulation. All the calculations have been carried out using…”

Highly Sensitive Ratiometric Fluorescent Paper Sensors for the Detection of Fluoride Ions

“…16,17 Recently, fluorescent probes have been highly sensitive, operationally simple, and quick in the determination of F – in water, food, cells, and mammals. 18−25 Many F – fluorescent probes have been reported whereby the reaction mechanisms are based on anion−π interactions, 26,27 competitive interactions, 28−31 Lewis acid–base interactions, 32−34 hydrogen-bonding interactions, 35−37 and the F – -induced fracture of Si–O, Si–C, and P–O bonds. 38−44 The F – ratiometric fluorescent probe based on a F – -induced bond-breaking mechanism is still relatively uncommon.…”

“…To date, several methods have been developed for the detection of F – , including fluorine reagent colorimetry, , F NMR, ion chromatography, and the ion-selective electrode . However, most approaches dedicated to determining F – levels are complicated, time-consuming, and expensive procedures that have limited adaptability. , Recently, fluorescent probes have been highly sensitive, operationally simple, and quick in the determination of F – in water, food, cells, and mammals. − Many F – fluorescent probes have been reported whereby the reaction mechanisms are based on anion−π interactions, , competitive interactions, − Lewis acid–base interactions, − hydrogen-bonding interactions, − and the F – -induced fracture of Si–O, Si–C, and P–O bonds. − The F – ratiometric fluorescent probe based on a F – -induced bond-breaking mechanism is still relatively uncommon. − As a fluorescent probe with a F – -induced bond-breaking mechanism is highly selective and sensitive, ratiometric fluorescent probes can reduce interference from environmental conditions, instrumental efficiency, excitation intensity, and concentration.…”

A novel sensing capabilities and structural modification from thiourea to urea derivative by Hg(ClO4)2: Selective dual chemodosimeter for Hg2+ and F− ions

“…Fluoride ions (F -) are significant due to their role in dental care and the treatment of osteoporosis [36], among other applications. Fluoride is a strong hydrogen bond acceptor and has a high affinity for silicon and boron.…”