Colorimetric fluoride sensors based on deprotonation of pyrrole–hemiquinone compounds

Abstract

The combination of pyrrole and hemiquinone units produced a novel prototype of efficient colorimetric fluoride sensors, and the presence of the tautomerism effect provides additional means of modulating the sensing behavior.

Two new indole derivatives as anion receptors for detecting fluoride ion

“…in aqueous DMSO medium, and the fluorescence quenching effect of F À could be explained with a photoinduced electron transfer (PET) mechanism. The fitting of the fluorescence titration data shows that 1 recognizes F À in a 1:2 stoichiometry with the logarithm of the binding constant (log K) of 7.52 (based on the emission change at 590 nm), while 2 binds with F À with the stoichiometry of 1:2 and a log K of 8.99 (based on the emission change at 607 nm) [28][29][30].…”

Aminobenzohydrazide based colorimetric and ‘turn-on’ fluorescence chemosensor for selective recognition of fluoride

“…These adverse and beneficial effects of fluoride prompted many scientists to develop chemosensors for fluoride recognition [15]. Fluoride ion receptors based on triarylboranes [21,22], desilyation [23,24], Pyrroles [25,26], amides [27][28][29][30], ureas [31,32], thioureas [33][34][35], or sulphonamides [36,37] are available in literature. Receptors based on NH and OH deprotonation or hydrogen bond formation by fluoride ion [38][39][40][41] failed to report the selectivity of F -ion over the other competitive anions.…”

Anthraquinone and Indole based Chemosensor for Fluoride Anions Detection

“…Especially, NH-fragment in molecular structure has been studied due to its efficient to detect anions by deprotonation 18) . In this connection, .…”