Based on the 5-(3,4-dicarboxyphenoxy)isophthalic acid(H4dppa)ligand,two lanthanide metal-organic frameworks(Ln-MOFs)were designed and synthesized by hydrothermal synthesis:{(dima)[Dy(dppa)(H2O)2]·2.5H2O)n(Dy-MOF)and {(dima)[Eu(dppa)(H2O)2]·1.5H2O}n(Eu-MOF)(dima=dimethylamine cation).The structures were characterized by elemental analysis,infrared spectroscopy,single-crystal X-ray diffraction,etc.Dy-MOF and Eu-MOF are hetero-isomorphic 2D network structures,and adjacent 2D networks further form 3D supramolecular net-work structures through hydrogen bonding.Fluorescence analysis shows that Dy-MOF and Eu-MOF have excellent fluorescence properties at room temperature,and Dy-MOF has excellent fluorescence sensing properties,which can efficiently and high-sensitively detect a variety of pollutants in water:aniline(ANI),nitrobenzene(NB),tetracycline(TC),pyrimethanil(PTH),and tryptophan(Trp).The fluorescence quenching mechanism of Dy-MOF in detecting pollutants was also investigated.CCDC:2284537,Dy-MOF;2067689,Eu-MOF.
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