Two 8-hydroxyquinoline-based fluorescent chemosensors for ultra-fast and sensitive detection of water content in strong polar organic solvents with large Stokes shifts

Synthesis and Solvent Dependent Fluorescence of Some Piperidine-Substituted Naphthalimide Derivatives and Consequences for Water Sensing

“…The detection limit of piperidine-naphthalimide 8 to water in dioxane was estimated to be 0.151% using the standard deviation of blank sample and the slope of the linear regression fit. It is noteworthy that the detection limit is close to the values previously reported [ 35 , 73 ].…”

Water detection in organic solvents using a copolymer membrane immobilised with a fluorescent intramolecular charge transfer-type dye: effects of intramolecular hydrogen bonds

“…Optical chemical sensors (optodes) have attracted considerable attention because of their simplicity; 10 therefore, numerous water-detecting optodes based on colourimetric and/or fluorescent dyes have been developed to date. 11–35 Fluorescence-based optodes are typically more sensitive than colourimetry-based optodes. The response mechanism of fluorescence-based optodes containing organic fluorophores can be classified based on the fluorescence mechanism 18,19 into photo-induced electron transfer (PET), 20–24 intramolecular charge transfer (ICT), 21,25–28 twisted ICT (TICT), 26,29,30 aggregation-induced emission (AIE), 24,29,30,32,33 and excited-state intramolecular proton transfer (ESIPT), 31,34,35 and so on.…”

“…11–35 Fluorescence-based optodes are typically more sensitive than colourimetry-based optodes. The response mechanism of fluorescence-based optodes containing organic fluorophores can be classified based on the fluorescence mechanism 18,19 into photo-induced electron transfer (PET), 20–24 intramolecular charge transfer (ICT), 21,25–28 twisted ICT (TICT), 26,29,30 aggregation-induced emission (AIE), 24,29,30,32,33 and excited-state intramolecular proton transfer (ESIPT), 31,34,35 and so on. In addition to the organic-fluorophore-based water detectors, other luminescent inorganic and/or organic water detectors – such as graphene quantum dots, 36 carbon dots (CDs), 37–40 covalent organic frameworks (COFs), 41–44 and metal–organic frameworks (MOFs) 39,45–47 – have been developed over the past decade.…”

Phenol-based styrylpyrylium dyes for trace water detection via chromogenic and fluorogenic responses

“…Several molecules, complexes, polymers and nanoparticles have been described to detect moisture in organic solvents and daily use items, like drugs and food [16][17][18][19]. The nature of those chemosensing systems is very diverse, including mainly metallic complexes [20][21][22][23][24][25][26][27] but also rhodamine de-rivatives [28][29][30], phenothiazines [31,32], naphthalimides [33], bodipy-related compounds [34], off-the-shelf commercial dyes [35,36], bichromophoric compounds [37,38], organic polymers [39], carbon dots [40][41][42], metallic nanoclusters [43] and other [44][45][46][47][48]. Among that impressive chemical variety, no example of pyrylium dye has been reported so far to the best of our knowledge, despite the easy synthesis of this class of compounds.…”