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A dual-functional AIE luminogen for sensitive nitro explosive detection and efficient photolabeling
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DOI：10.1039/D5AY01309G.png)
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Abstract
En 中文
Luminescent materials with aggregation-induced emission (AIE) characteristics have gained considerable attention as highly effective optical sensing platforms due to their distinct photophysical properties. In this study; an anthracene Schiff base; AnTPh; has been synthesized via a facile one-step condensation reaction for selective detection of picric acid among various nitroaromatic compounds. Photoluminescence and UV-vis analyses confirmed the AIE feature of AnTPh in a CH3CN–H2O solvent system. Further characterization using time-resolved fluorescence (TRF) and scanning electron microscopy (SEM) reinforced its AIE behavior; revealing an associated increase in fluorescence lifetime. The aggregated AnTPh structures exhibited strong emission and demonstrated selective fluorescence quenching in response to picric acid when excited at 400 nm. With a high Stern–Volmer constant (7.3 × 105 M−1) and a detection limit of 0.65 μM; AnTPh displayed excellent sensitivity; highlighting its potential for nitroexplosive detection. Mechanistic investigations suggested a static quenching process facilitated by ground-state complex formation between AnTPh aggregates and picric acid. Beyond its sensing capabilities; AnTPh also exhibited notable antibacterial activity against E. coli and S. aureus; as confirmed through disc diffusion assays. Furthermore; its luminescent properties enabled effective microbial photolabeling; positioning AnTPh as a promising candidate for future biomedical applications.