Multifunctional Lanthanide Metal-Organic Frameworks Are Used for Fluorescence Sensing of Bi, HPO, Flu, and PNBA and Application.

Using a nitrogen-containing tricarboxylic acid ligand (imidazole-1-yl) benzene-2,4,6-tricarboxylic acid (Httc) and lanthanide metal elements (Dy, Eu, Nd, and Gd), four lanthanide metal organic frameworks (Ln-MOFs) with the same structure, namely, {[Dy (Httc)]·1.5DMF}(1), {[Eu (Httc)]·1.5DMF}(2), {[Nd (Httc)]·1.5DMF}(3), and {[Gd (Httc)]·1.5DMF}(4), were synthesized under solvothermal conditions. The characterization analysis showed that the four isomorphic Ln-MOFs were trigonal crystals of the 3̅ space group, with good phase purity and thermal stability. Fluorescence analysis showed that complex can be an excellent fluorescence sensor for Bi, HPO, and fluridine (Flu), while complex can be an excellent fluorescence sensor for -nitrobenzoic acid (PNBA). And their sensing mechanisms were discussed in detail. The fluorescent test paper and fluorescent seal were prepared by using the excellent luminescence properties of and , and the pesticide on the surface of cherry tomato was detected. The applicability of these MOFs as fluorescence sensors was proved. Therefore, Ln-MOFs are expected to have unpredictable application prospects in the field of environmental detection.