A water-stable 2D Y-MOF decorated with tris(3' -F-4' -carboxybiphenyl) amine for multi-responsive fluorescence sensing of CrVI and nitrofuran antibiotics

By using tris(3'-F-4'-carboxybiphenyl)amine (H3TFBA) and rare earth element Y(III), one 2D layered structure with the formula {[Y(TFBA)(H2O)2]center dot 4H2O center dot DMF}n (1), has been solvothermal synthesized and fully character-ized. Structural analyses demonstrated that the central Y(III) ions were interconnected by deprotonated TFBA3-to produce a 2D layer, and the neighboring layers were developed into a 3D supramolecular structure through hydrogen-bonding interactions. Powder X-ray diffraction (PXRD) of 1 exhibited excellent different pH and sol-vent stability. Luminescent experiment indicated that 1 could instantly and sensitively detect Cr2O72-, CrO42-, NFZ and NFT in aqueous solution with low detection limits of 2.27 x 10-5 M, 2.03 x 10-5 M, 3.4 x 10-6 M, 1.09 x 10-5 M, respectively. Moreover, convenient and naked-eye detection were also provided by exquisitely made 1 fluorescence test papers and mixed matrix membranes (MMMs). Importantly, the possible quenching reasons have been thoroughly examined, which were supported by PXRD analysis, UV-vis spectra, luminescence ex-periments and density functional theory (DFT) calculation.