Pyrene-Hydrazone-π···Hole Coupled Turn-on Fluorescent and Naked- Eye Colorimetric Sensor for Cyanide: Role of Homogeneous π-Hole Dispersion in Anion Selectivity

Benzotiazole‐Based Colorimetric Chemosensor for the Effective Detection of Hazardous Cyanide Ions

“…Similar spectral changes for hydrazones in the presence of cyanide ions, as a result of molecular complexation, were described. [38,40] The other anions show no significant absorption band shift or color change, which indicates the absence of such molecular complexation.…”

“…[30,31] The simplicity of their synthesis, high molar extinction coefficients, and good light-and moisture-resistance properties are significant advantages in chemosensorics. [32][33][34] In recent years, hydrazone-type colorimetric chemosensors for cyanide ions are developed based on diketopyrrolopyrrole, [35] rhodamine B, [36] benzamide, [37] coumarin, [38,39] pyrene, [40] BODIPY, [41,42] azo dye, [43] triphenylamine, [44] naphtaline, [45] quinoline. [46] The mechanism of action of probes for cyanide includes a deprotonation event associated with NÀ H or OÀ H group, [35,36,45] forming a hydrogenbonded host-guest complex [37,38,40] and nucleophilic addition of an anion to the sensor.…”

“…[32][33][34] In recent years, hydrazone-type colorimetric chemosensors for cyanide ions are developed based on diketopyrrolopyrrole, [35] rhodamine B, [36] benzamide, [37] coumarin, [38,39] pyrene, [40] BODIPY, [41,42] azo dye, [43] triphenylamine, [44] naphtaline, [45] quinoline. [46] The mechanism of action of probes for cyanide includes a deprotonation event associated with NÀ H or OÀ H group, [35,36,45] forming a hydrogenbonded host-guest complex [37,38,40] and nucleophilic addition of an anion to the sensor. The NÀ H proton of the hydrazone becomes noticeably more labile due to the electron-withdrawing effect of the substituents.…”

Pyrene-naphthalimide Schiff base as a fluorescent pigment in water-based security ink

“…Various derivatives of this polycyclic aromatic hydrocarbon have displayed strong and distinct excimer emission with high fluorescence quantum yield. Though the fluorophore occasionally experiences quenching due to aggregation in solid or concentrated form, pyrene derivatives are used extensively in fluorescent probes, food colorants, OLEDs, biosensors, biomarkers, corrosion inhibitors, printing inks, chemosensors, colorimetric sensors (Kathiravan et al 2014;Domeño et al 2017;Shen et al 2019;Srinivasan et al 2021;Wang 2021), electroluminescent devices, paints, optoelectronics, (Gowri et al 2020;Jeyasingh et al 2021;Kr et al 2021;Uzun 2021;Yao et al 2021), and anti-counterfeiting (Maeda et al 2001;Homa et al 2017;Mohamed et al 2020;Boonnab et al 2021). Although various colorants are available, very few inks, such as bio-ink and tattoo inks, have been developed utilizing pyrene, primarily for inkjet and 3D printing.…”