研究目的
Detection of nitroaromatic explosives especially picric acid (PA) in aqueous medium with high selectivity and sensitivity.
研究成果
The AIE-active probe APPTPEP demonstrated high selectivity and sensitivity for PA detection in aqueous media, with a limit of detection of 31.5 nM. The strong interaction between the pyridyl group of APPTPEP and PA was confirmed, providing a foundation for the design of effective chemosensors for nitroaromatic explosives.
研究不足
The study focuses on the detection of PA in aqueous media, and the performance in other solvents or complex matrices was not explored. The practical application in real-world scenarios may require further optimization for environmental factors.
1：Experimental Design and Method Selection:
The study involved the synthesis of an AIE-active probe (APPTPEP) for PA detection by combining 1,4-dihydropyrrolo[3,2-b]pyrrole with tetraphenylethylene and pyridine units. The AIE behavior was investigated through UV-vis absorption and fluorescence emission spectra in DMF/water media.
2：Sample Selection and Data Sources:
The probe's interaction with PA was studied using 1H NMR titration and theoretical calculations.
3：List of Experimental Equipment and Materials:
Chemicals and solvents were purchased from commercial suppliers. Instruments included Bruker Avance NMR spectrometers, Nicolet 380 FT-IR, LTQ Orbitrap XL mass spectrometer, TU-1901 UV-vis spectrometer, and Hitachi FL-7000 fluorescence spectrometer.
4：Experimental Procedures and Operational Workflow:
The synthesis of APPTPEP involved a series of reactions followed by purification. The sensing performance was evaluated through fluorescence quenching experiments in the presence of PA and other nitroaromatic compounds.
5：Data Analysis Methods:
The fluorescence quenching data were analyzed using the Stern-Volmer equation to determine the quenching constant and limit of detection.
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