A Highly Efficient Fluorescent Sensor Based on AIEgen for Detection of Nitrophenolic Explosives

Area of Science:

• Analytical Chemistry
• Materials Science
• Environmental Science

Background:

• Accurate detection of nitrophenolic explosives is crucial for security and environmental safety.
• Distinguishing structurally similar nitroaromatic compounds poses a significant analytical challenge.
• Existing detection methods may lack selectivity or portability.

Purpose of the Study:

• To develop a highly selective fluorescent sensor for nitrophenolic explosives.
• To investigate the sensing mechanism and applicability of the probe.
• To explore the potential for portable explosive detection devices.

Main Methods:

• Synthesis of a tetraphenylethene (TPE) derivative exhibiting aggregation-induced emission (AIE).
• Utilizing the AIE-active probe as a fluorescent sensor for nitrophenolic explosives (TNP, DNP).
• Employing fluorescence titration and 1H NMR spectroscopy to elucidate the sensing mechanism.

Main Results:

• The TPE derivative demonstrated high selectivity for nitrophenolic explosives in both aqueous and solid states.
• Fluorescence quenching was observed specifically for hydroxyl-containing nitrophenolic explosives.
• The sensing mechanism was confirmed through spectroscopic analysis.

Conclusions:

• A simple AIE-active probe enables selective detection of nitrophenolic explosives.
• The probe's sensitivity to hydroxyl groups enhances its specificity.
• The developed sensor holds potential for creating portable explosive detection systems.