Lanthanide metal–organic frameworks based on a 1,2,3-triazole-containing tricarboxylic acid ligand for luminescence sensing of metal ions and nitroaromatic compounds

摘要

A series of novel 3D lanthanide metal–organic frameworks based on unsymmetrical 1,2,3-triazole-containing tricarboxylic acid ligand 5-[4-(4-carboxy-phenyl)-[1,2,3]triazol-1-yl]-isophthalic ( H _(3) TAIP ) has been synthesized under solvothermal conditions. The ligand was synthesized with diethyl-5-azidoisophthalate and 4-ethynyl-benzoic acid ethyl ester through the copper-catalyzed azide alkyne cycloaddition (CuAAC) reaction. Single-crystal X-ray diffraction analyses reveal that these metal–organic frameworks are isostructural. The structures are constructed by bi-nuclear lanthanide metal clusters and TAIP ~(3?) ligands and possess flu-3,6- C 2/ c net with point symbol (4 ~(2) .6) _(2) (4 ~(4) .6 ~(2) .8 ~(7) .10 ~(2) ). We explore the luminescence properties of compound 1 , which shows the characteristic emission of Tb ~(3+) and exhibits selective detection of 4-nitrophenol and Fe ~(3+) ions in ethanol solution over other nitroaromatic compounds and metal ions.