Chemical Research in Chinese Universities ›› 2024, Vol. 40 ›› Issue (1): 119-126.doi: 10.1007/s40242-023-3228-5

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Two Indium(III)-based Fluorescent Metal-Organic Frameworks for Highly Sensing Fe3+, 2,4-DNP, and TNP

WANG Dan, LI Wen, LI Guanghua, HUA Jia, LIU Yunling   

  1. State Key Laboratory of Inorganic Synthesis & Preparative Chemistry, Jilin University, Changchun 130012, P. R. China
  • Received:2023-10-17 Online:2024-02-01 Published:2024-01-24
  • Contact: HUA Jia, LIU Yunling;
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Nos. 22171100, 22288101) and the “111” Project of China (No. B17020).

Abstract: Two novel metal-organic frameworks (MOFs), JLU-MOF130 ([In(NH2-BDC)(Imi)(1H-Imi)]·DMF·H2O, NH2-H2BDC=2-aminoben-zene-1,4-dicarboxylic acid, 1H-Imi=1H-imidazole, DMF=N,N-dimethylformamide) and JLU-MOF131 ([In(1,4-NDC)(Imi) (1H-Imi)]·DMF0.5, 1,4-H2NDC=1,4-naphthalene-dicarboxylic acid), were synthesized. JLU-MOF130 features a three-dimensional (3D) architecture with a neb topology. JLU-MOF131 is characterized by a two-dimensional (2D) structure with an sql topology. JLU-MOF130 has excellent fluorescence detection performance towards Fe3+, 2,4-dinitrophenol (2,4-DNP), and 2,4,6-trinitrophenol (TNP), but the fluorescence detection performance of JLU-MOF131 is further improved by converting NH2-H2BDC to more conjugated 1,4-H2NDC. The Stern-Volmer (SV) quenching constant (KSV) values of JLU-MOF130 sensing 2,4-DNP, TNP, and Fe3+ are 5.24×104, 4.44×104, and 4.73×103 L/mol, respectively. The corresponding limit of detection (LOD) values are 1.17, 1.36, and 14.59 µmol/L. The KSV values for JLU-MOF131 are 1.26×105, 9.02×104, and 8.48×103 L/mol, and the corresponding LOD values are 0.35, 0.42, and 3.60 µmol/L, respectively. Interestingly, the emission wavelengths of the two MOFs obviously shift as the fluorescence emission intensities decrease upon the addition of 2,4-DNP and TNP, which can be applied in selective detection.

Key words: Metal-organic framework, Fluorescence quenching, Fe3+, 2,4-Dinitrophenol (2,4-DNP), 2,4,6-Trinitrophenol (TNP)