Aggregation-induced emission (AIE)-active aromatic tetraaldehydes are utilized as starting monomers to create two fluorescent polymers (PAN-TPEs) with hierarchical pores ranging from micropores (1.4–1.9 nm) to mesopores (3.8–26.2 nm). Their chemsensing properties for five pesticides, including imidacloprid, acetamiprid, triflumizole, lambda-cyhalothrin, and indoxacarb, are studied. It is found that the Stern–Volmer quenching coefficient and the limit of detection for imidacloprid in the water medium reach 53 745 M^–1 and 28 ppb, respectively, which are much superior to those of the reported porous materials in the literature and exceed 3–10 times of the other four pesticides. Moreover, the polymers exhibit fast fluorescence response for imidacloprid (less than 4 s), and the detection sensitivity is nearly not affected by the common cations and anions. Additionally, the studies reveal that, for the polymer sample with narrower pore channels, the recognition ability for imidacloprid strongly depends on the molecular volumes of pesticides, whereas in the case of the polymer with larger pore sizes, the inner filter effect and the photoinduced electron transfer between the pesticides and the chromophore groups in the polymer skeleton become the major factors. The results are of significance for understanding the effects of porosity parameters and AIE groups in fluorescent porous polymers on the recognizable detection of imidacloprid from other pesticides.

中文翻译：

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AIE 活性荧光多孔聚合物可识别检测吡虫啉及其结构-性质关系

聚集诱导发光 (AIE) 活性芳族四醛被用作起始单体，以产生两种荧光聚合物 (PAN-TPE)，其具有从微孔 (1.4–1.9 nm) 到中孔 (3.8–26.2 nm) 的分级孔隙。研究了它们对五种农药的化学传感特性，包括吡虫啉、啶虫脒、氟菌唑、高效氯氟氰菊酯和茚虫威。发现吡虫啉在水介质中的Stern-Volmer猝灭系数和检出限达到53 745 M ^–1和 28 ppb，远优于文献报道的多孔材料，超过其他四种农药的 3-10 倍。此外，该聚合物对吡虫啉具有快速荧光响应（小于 4 s），检测灵敏度几乎不受常见阳离子和阴离子的影响。此外，研究表明，对于孔道较窄的聚合物样品，吡虫啉的识别能力在很大程度上取决于农药的分子体积，而对于孔径较大的聚合物，内部过滤效应和光生电子农药与聚合物骨架中发色团之间的转移成为主要因素。