查看更多>>摘要:Two novel metal-organic frameworks(MOFs),JLU-MOF130([ln(NH2-BDC)(lmi)(1H-lmi)]-DMF-H20,NH2-H2BDC=2-aminoben-zene-1,4-dicarboxylic acid,1H-lmi=1H-imidazole,DMF=N,N-dimethylformamide)and JLU-MOF131([ln(1,4-NDC)(lmi)(1H-lmi)]-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 4.73x103 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.