Abstract
A novel bimetallic organic framework material based on 3,5-di (2′, 4′ - dicarboxylphenyl) benozoic acid (H5L) ligand, named {[Tb9CoL6(H2O)6 (H3O)]·4DMF·2H2O}n [L = C23H9O10, DMF = N, N- Dimethylformamide) (Tb-Co-MOF), had been successfully synthesized by solvothermal method. The structure and properties of Tb-Co-MOF were characterized by single-crystal X-ray diffraction, elemental analysis, thermogravimetric analysis, powder X-ray diffraction, ultraviolet spectrum, infrared spectrum and fluorescence spectrum. This results indicated that Tb-Co-MOF was crystallized in the trigonal system with the R3 space group and it was a novel three-dimensional structure, good thermal stability and luminous performance. Fluorescent film was prepared with Tb-Co-MOF powders by polymer embedding method. This film had high fluorescence recognition ability for histamine (HIS), Fe3+ ion and Cr2O72− anion, so it could be used as a selective fluorescence sensor for them. Their detection limits were 1.43 μmol·L−1, 0.94 μmol·L−1 and 0.96 μmol·L−1, respectively. Compared with the powder MOFs, the fluorescence film had the advantages of high sensitivity, good selectivity, fast response speed, high stability and strong reversibility, which provided a certain reference for the application of metal-organic framework materials in environmental detection.
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