Abstract
Six isostructural three-dimensional (3D) lanthanide metal-organic frameworks (Ln-MOFs), [Ln(μ2-OH)(PDC)(H2O)2]·DMF (Ln=Pr (1), Nd (2), Eu (3), Tb (4), Ho (5), and Yb (6), H2PDC=pyridine-3,5-dicarboxylic acid), have been successfully synthesized under solvothermal conditions and characterized by single crystal X-ray diffraction, IR spectroscopy, elemental analysis and thermal gravimetric analysis. The framework contains unusual Ln-carboxylate/μ2-OH left-handed helical chains, which are extended by PDC2− linkers to form 3D networks with 1D hexagonal channel. The lanthanide contraction effect induces the decreases of average Ln- distances from Pr to Yb. Due to the efficient sensitization of PDC2− ligand, complexes 2 and 6 display strong characteristic luminescence in the near-infrared (NIR) region, respectively. Moreover, the luminescent properties of complexes 3 and 4 are also studied in the solid state at room temperature.
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