Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, Tianjin Key Laboratory of Drug Targeting and Bioimaging, School of Chemistry and Chemical Engineering, Tianjin University of Technology, No. 391 Binshuixi Road, Tianjin, 300384, China.
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, China.
Anal Methods. 2021 Dec 9;13(47):5700-5710. doi: 10.1039/d1ay01837j.
Pesticides, as a type of toxic chemicals widely used for a long time, not only pollute the environment but also affect people's health and cause serious harm to the human body, soil and environment. Therefore, it is very necessary to exploit a portable and environmentally friendly method to detect pesticides with high sensitivity. Herein, a new luminescent metal-organic framework ([Zn(TPYBDC)·HO], TPYBDC = 4'-(pyridin-4-yl)-[2,2':6',2''-terpyridine]-4,4''-dicarboxylate) with 2D coordination layers has been designed and assembled using 4'-(pyridin-4-yl)-[2,2':6',2''-terpyridine]-4,4''-dicarboxylic acid as the ligand. The as-synthesized Zn-LMOF was exfoliated to ultrathin 2D nanosheets (4-5 nm) to form a luminescence colloidal sensor by destroying the weak interaction between the coordination layers such as H-bonding between the matrix HO and the coordination carboxyl oxygen, and the π-π interactions among the interlayer conjugated aromatic rings. Investigation of its recognition and detection ability towards chemical pesticides shows that it can sensitively detect pesticides such as imidacloprid, nitenpyram and dinotefuran fluorescence quenching effect with very low detection limit (LOD). Using imidacloprid as a typical case, a LOD value of 0.562 μM and recoveries for the simulated agricultural environmental samples in the range of 94-115% suggests that the as-fabricated 2D Zn-MOF nanosheet colloidal sensor (Zn-LMOF probe) is a most promising candidate for sensing chemical pesticides.
农药作为一种长期广泛使用的有毒化学物质，不仅污染环境，还影响人们的健康，对人体、土壤和环境造成严重危害。因此，开发一种便携式、环保的方法来检测高灵敏度的农药是非常必要的。在此，我们设计并组装了一种新的发光金属有机骨架([Zn(TPYBDC)·HO]，TPYBDC=4'-(吡啶-4-基)-[2,2':6',2''-三联吡啶]-4,4''-二羧酸)，使用 4'-(吡啶-4-基)-[2,2':6',2''-三联吡啶]-4,4''-二羧酸作为配体。所合成的 Zn-LMOF 被剥离成超薄的 2D 纳米片(4-5nm)，通过破坏基质 HO 与配位羧基氧之间的氢键等配位层之间的弱相互作用，以及层间共轭芳环之间的π-π相互作用，形成发光胶体传感器。对其识别和检测化学农药的能力进行研究表明，它可以对农药如吡虫啉、噻虫嗪和呋虫胺进行灵敏的荧光猝灭检测，检测限非常低(LOD)。以吡虫啉为例，LOD 值为 0.562 μM，模拟农业环境样品的回收率在 94-115%之间，这表明所制备的 2D Zn-MOF 纳米片胶体传感器(Zn-LMOF 探针)是一种很有前途的化学农药传感候选物。
