Abstract
•A series isostructural Ln-MOFs containing dinuclear SBU were constructed.•The compounds show a 8-connected 3D framework with the bcu topological net.•Its photocatalytic property and possible reaction mechanism were investigated.
Five new lanthanide metal–organic frameworks (Ln(III)-MOFs), namely, [Ln(L)(HL)(H2O)]n•1.5nH2O (Ln(III) = Eu(1), Er(2), Dy(3), Gd(4) and Sm(5)) (H2L=5-(1H-1,2,4-triazol-1-yl)-1,3-benzenedicarboxylic acid) have been synthesized under hydrothermal condition and characterized by elemental analysis, IR spectra, powder X-ray diffraction and single crystal X-ray diffraction. Compounds 1–5 are formed at pH 3.5, which are isostructural and show 8-connected 3D framework with the bcu topological net and the Schläfli symbol of {424•64}. Interestingly, the deprotonated H2L ligands adopt respectively two different coordination behaviors (the fully deprotonated L2− and partially deprotonated HL−) to extend the framework. Additionally, compound 1 was successfully used as a photocatalyst for the degradation of organic dye rhodamine B (Rh B) under UV light irradiation and its possible reaction mechanism was also studied.
Five isostructural 8-connected 3D Ln-MOFs with the bcu topological net and the Schläfli symbol of {424•64} have been synthesized and showed effective degradation to Rh B. Meanwhile, the plausible mechanism was investigated.
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