College of Chemistry, Liaoning University, Shenyang 110036, China.
School of Environmental Science, Liaoning University, Shenyang 110036, China.
Molecules. 2021 Dec 26;27(1):126. doi: 10.3390/molecules27010126.
Eating vegetables with pesticide residues over a long period of time causes serious adverse effects on the human body, such as acute poisoning, chronic poisoning, and endocrine system interference. To achieve the goal of a healthy society, it is an urgent issue to find a simple and effective method to detect organic pesticides. In this work, two fluorescent porous organic polymers, LNU-45 and LNU-47 (abbreviation for Liaoning University), were prepared using π-conjugated dibromopyrene monomer and boronic acid compounds as building units through a Suzuki coupling reaction. Due to the large π-electron delocalization effect, the resulting polymers revealed enhanced fluorescence performance. Significantly, in sharp contrast with the planar π-conjugated polymer framework (LNU-47), the distorted conjugated structure (LNU-45) shows a higher specific surface area and provides a broad interface for analyte interaction, which is helpful to achieve rapid response and detection sensitivity. LNU-45 exhibits strong fluorescence emission at 469 nm after excitation at 365 nm in THF solution, providing strong evidence for its suitability as a luminescent chemosensor for organic pesticides. The fluorescence quenching coefficients of LNU-45 for trifluralin and dicloran were 5710 and 12,000 (LNU-47 sample by ca. 1.98 and 3.38 times), respectively. Therefore, LNU-45 serves as an effective "real-time" sensor for the detection of trifluralin and dicloran with high sensitivity and selectivity.
长期食用带有农药残留的蔬菜会对人体造成严重的不良影响，如急性中毒、慢性中毒和内分泌系统干扰。为了实现健康社会的目标，寻找一种简单有效的方法来检测有机农药是当务之急。在这项工作中，使用 π-共轭二溴并[def]苯并[ghi]苝单体和硼酸化合物作为构建单元，通过 Suzuki 偶联反应制备了两种荧光多孔有机聚合物 LNU-45 和 LNU-47（简称辽宁大学）。由于大的 π-电子离域效应，所得聚合物表现出增强的荧光性能。值得注意的是，与平面 π-共轭聚合物骨架（LNU-47）相比，扭曲的共轭结构（LNU-45）具有更高的比表面积，并为分析物相互作用提供了广阔的界面，这有助于实现快速响应和检测灵敏度。LNU-45 在 THF 溶液中在 365nm 激发下在 469nm 处显示出强荧光发射，为其作为有机农药的荧光化学传感器的适用性提供了有力证据。LNU-45 对氟乐灵和二氯丹的荧光猝灭系数分别为 5710 和 12000（LNU-47 样品约为 1.98 和 3.38 倍）。因此，LNU-45 可作为检测氟乐灵和二氯丹的有效“实时”传感器，具有高灵敏度和选择性。
