Selective sensing and visualization of pesticides by ABW-type metal–organic framework based luminescent sensors

Abstract

A novel ABW-type luminescent metal–organic framework was applied for selective visualization sensing of trace amounts of 2,6-dichloro-4-nitroaniline and vapor sensing of trifluralin.

Pyrene-Based Fluorescent Porous Organic Polymers for Recognition and Detection of Pesticides

“…The limit of detection (LOD) is defined as 3σ/ K sv ( σ is the standard deviation of the blank solution). The calculated detection limits of DCN were 0.0155 ppm for LNU-45 and 0.0197 ppm for LNU-47, which is better than some reported values, such as 0.13 ppm for BPyTPE, 2.93 ppm for (H 3 O)[Zn 2 L(H 2 O)]·3NMP·6H 2 O, 3.85 ppm for {(Me 2 NH 2 )[In(BDPO)]·DMF·2H 2 O} n , 0.212 ppm for 1-L, 0.233 ppm for 3-L, and 0.1753 ppm for DNA-AuNCs [ 1 , 14 , 49 , 50 , 51 ]. The results demonstrated that LNUs could detect trifluralin and dicloran with high selectivity and sensitivity, providing the possibility of detecting residual organic pesticides for practical applications.…”

“…Pesticide residues have posed huge risks to humans and the ecological environment, causing health problems such as skin irritation, headaches, cancer, and asthma [ 1 ]. Pesticides consist of a set of insecticides and herbicides, primarily applied in forestry and crop plantations.…”

Metal–organic framework thin films as versatile chemical sensing materials

“…84,85 Photofunctionality can be introduced into MOF thin films through a variety of ways: 86 the use of chromophoric organic linkers within the MOF structures, 87 optically-active metal centers (particularly emissive lanthanides), 88 or via host-guest interactions, in which photoactive ions, 89,90 metal complexes, 91,92 molecules, 93-96 nanoparticles, 97-100 and/or other species are encapsulated by the MOF. MOF-based optical sensors are intriguing because they typically exhibit rapid response times (often on the order of seconds), [101][102][103][104] high sensitivity (ppb or lower LOD), 103,105,106 recyclability (via removal of analyte from the MOF after each sensing cycle), 103,104,[107][108][109] and usually can be integrated with inexpensive, portable equipment, 90 such as fiber optic-based platforms. 104,110,111 Indeed, many optical sensors allow for naked-eye detection of analytes and require only simple laser pointers, lightemitting diodes, UV lamps, or other portable excitation sources for operation.…”

“…112 Several examples of portable luminescent sensing films are displayed in Figure 8. These films are typically fabricated by deposition on substrates such as glass, 128,129,144 metal oxides, 102 and paper, 148,167 or through dispersion in glues 113 and transparent polymers 131 such as poly(methyl methacrylate). 127 Additionally, it is often straightforward to reuse immobilized MOF thin films across multiple sensing cycles, whereas MOFs dispersed in solution are typically more difficult to recover and regenerate (Table 4).…”

Dicarboxylate Ligands Modulated Structural Diversity in the Construction of Cd(II) Coordination Polymers Built from N-Heterocyclic Ligand: Synthesis, Structures, and Luminescent Sensing

“…Luminescent CPs have drawn intense concern as promising fluorescence sensors because of their tunable architectures and excellent optical properties. − Immobilized unsaturated (open) Lewis basic sites within CPs can determine the selective recognition of particular metal ions and thus can improve the luminescent sensing ability for metal ions. − The powerful luminophore in CPs is also crucial, which can decide the efficient recognition of the guest molecules. − Considering this, we selected a multidentate bridging linker 1-(2-methylbenzimidazol-1-ylmethyl)­benzotriazole (mbbt), which has been proven to construct CPs with Lewis basic sites . In addition, the structures and properties of CPs can be modulated by the use of carboxylic acids as auxiliary ligands.…”