Triazine-Based Hexacarboxylate Metal-Organic Framework Crystalline Materials: Synthesis, Structural Characterization,...

A new triazine-based polycarboxylate metal-organic framework with a three-dimensional microporous structure, (H₃O)₂·[Eu₂(TDPAT)_4/3(μ-H₂O)]·7H₂O·EtOH·5DMA (complex 1), was constructed by the reaction of the ligand 2,4,6-tris(3,5-dicarboxyaniline)-1,3,5-triazine (H₆TDPAT) and EuCl₃·6H₂O under solvothermal conditions. It was characterized by infrared spectroscopy (IR), ultraviolet-visible (UV-vis) spectra, fluorescence spectra, powder X-ray diffraction (PXRD), thermogravimetric (TG) analysis, etc. Structural analysis shows that the three-dimensional microporous structure is constructed by a binuclear structural unit [Eu₂(COO)₂(μ-H₂O)] and a TDPAT ligand. Fluorescence sensing exploration was conducted for complex 1, and experiments found that various drug molecules and phenolic compounds are responsible for the observed fluorescence quenching. Among them, the fluorescence quenching constant K_SV of complex 1 for the drug molecule moxifloxacin hydrochloride is as high as 1.57 × 10⁵ M^-1. In addition, it was found that the detection effect of complex 1 for nitrophenols is superior to that of chlorinated phenols. Therefore, complex 1 is expected to become a multifunctional fluorescent sensor in the future.