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Fluorescent determination of nitroaniline isomers based on ultrasensitive hydrophilic TPE sensors
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Fluorescent determination of nitroaniline isomers based on ultrasensitive hydrophilic TPE sensors
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Fluorescent determination of nitroaniline isomers based on ultrasensitive hydrophilic TPE sensors
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Journal Article
Fluorescent determination of nitroaniline isomers based on ultrasensitive hydrophilic TPE sensors
2024
Overview
Nitroaniline compounds are widely used as explosives and also in the industrial production process. However, as one group of rich-nitro materials, it is hard to discriminate nitroaniline isomers from other energetic materials. Hereby, TPE derivatives with mono-, di-, tetra-substituted hydrophobic alkyl chain and hydrophilic quaternary ammonium salt chain were synthesized and characterized. Their fluorescence properties and AIE characteristics were comprehensively studied through fluorescence spectra, fluorescence lifetime, and fluorescence yield. The hydrophilicity and number of substituents both have a great impact on their AIE effect. The obtained hydrophobic TPE2Br and di-substituted hydrophilic TPE2N were investigated as explosive sensors. TPE2Br has fluorescent turn-on response to the tested explosives. TPE2N has unique fluorescent turn-off response to the nitroaniline isomers. By adding nitroaniline isomers were added to the TPE2N solution, the fluorescence intensity quenched to varying degrees. While to other explosives, it demonstrates fluorescent turn-on effect. The quenching constant Ksv of TPE2N to 4-NA is 1.24 *10 7 and its limit of detection (LOD) is 0.47 μM. TPE2N could work as an ultrasensitive, low-cost and rapidly responsive sensor for the recognition of nitroanilines.
Publisher
IOP Publishing
