Two quinoxaline-based luminogens (1a and 1b) appending with triphenylethene rotors with donor–acceptor–donor (D–A–D) backbone are synthesized by a facile synthetic strategy. They show aggregation-enhanced emission (AEE) phenomenon in CH₃CN-water mixture. The aggregates of 1a and 1b show highly sensitive and selective fluorescent quenching responses toward picric acid (PA) aqueous solution among a number of nitroaromatic compounds. The quenching constants of K_SV were evaluated to be 7.92*10⁵ M⁻¹ and 5.76*10⁵ M⁻¹ for 1a and 1b, respectively. These aggregates are also able to detect PA in vapor phase. The test strip-based sensors can readily detect PA in aqueous media by naked-eye observation instantly at the concentration as low as 5*10⁻⁶ M. Our findings demonstrate that 1a and 1b have great potential as excellent sensors for PA. Mechanism studies reveal that synergistic effect of electron transfer, resonance energy transfer and more cavities of nanoaggregates is conducive to good selectivity and high sensitivity of chemosensors (1a and 1b) for detection PA.

通过一种简便的合成策略，可以合成两个基于喹喔啉的发光剂（1a和1b）以及带有供体-受体-供体（DA-D）骨架的三苯乙炔转子。它们在CH ₃ CN-水混合物中显示出聚集增强发射（AEE）现象。在许多硝基芳族化合物中，1a和1b的聚集体对苦味酸（PA）水溶液显示出高度敏感和选择性的荧光猝灭响应。对于1a和1b，K _SV的猝灭常数经评估为7.92 * 10 ⁵  M ^-1和5.76 * 10 ⁵  M ^-1， 分别。这些聚集体还能够检测气相中的PA。基于测试条的传感器可以通过肉眼观察立即在低至5 * 10 ^-6  M的浓度下轻松检测水性介质中的PA 。我们的发现表明1a和1b具有作为PA优良传感器的巨大潜力。机理研究表明，电子转移，共振能量转移和纳米聚集体的更多空洞的协同效应有助于化学传感器（1a和1b）对PA的良好选择性和高灵敏度。