Highly selective colorimetric and fluorescent chemosensor for fluoride based on fluorenone armed calix[4]arene

Nonlinear Optical Properties and Applications of Fluorenone Molecular Materials

“…[101] A turn-on fluorescent Al 3+ ion sensor was also built on a fluorenone core working via a photoinduced electron transfer mechanism. [125] Fluorenone moeity based organic sensors for fluoride, [126,127] aniline vapor, [128] biological entities are also reported. [129] 6.…”

A hydrazide organogelator for fluoride sensing with hyperchromicity and gel-to-sol transition

“…9 In previous studies, various uoride sensing molecules containing both chromophore and receptor motifs for color or uorescence emission and recognition of uoride, respectively, were developed. For instance, anthracene, 10,11 anthraquinone, 12,13 calixpyrrole, 14,15 dipyrrolylquinoxaline, 16 and other chromophore molecules have been used as chromogenic units, displaying various colors and/or uorescence. In addition, uoride-binding motifs such as urea, 17,18 thiourea, 19,20 hydrazide, 21,22 indole, 23,24 and imidazole 23,25 groups have been adopted for selective recognition of uoride.…”

Phenazine‐Based Fluorescence “Turn‐Off” Sensor for Fluoride: Application on Real Samples and to Cell and Zebrafish Imaging

“…Fluoride is the cause of many deadly diseases such as infertility, [7] fluorosis, [8] depress cell growth, [9] oral/gum recession, impairs thyroid, [10] kidney, bone strength and IQ, [11][12][13] cancer and overdose can lead to even death. [14] In nature, there are various sources of fluoride such as metal ores, seafood, tea, and many fruits. Artificial sources of fluoride are of immense use in large-scale industries such as mining, steel and sponge iron, crude oil refinery and drilling, aluminum industry, chemical and plastic industry, agriculture and pesticide manufacturer, dye manufacturer, metal extraction and so forth and in many daily need goods such as toothpaste, mouth rinses and in food supplements.…”

“…According to "WHO" regulation, permissible limit of fluoride in water is around 1.5 mg/Liter. [20] There are explicit reports for fluoride ion sensing based on various mechanisms like deprotonation-protonation, [14] chemodosimetric approach, [15] complexation with probe though H-bond formation, [16] use of metal complexes as fluoride detector, [17] pH depended trapping of fluoride using specific core size of the receptor. Of these methods, deprotonation of acidic proton present in receptor distinctness, as this approach allows for the permanent achievement of low detection limit, high specificity and selectivity; low response time and distinct intense colorimetric and fluorometric response through Internal Charge Transfer (ICT) mechanism.…”