Abstract

A family of new three-dimensional (3D) 2p-4f metal-organic frameworks (MOFs), namely [Na2Ln(L)(OH)(H2O)3]n (H4L=naphthalene-1,4,5,8-tetracarboxylic acid, Ln=Gd (1), Tb (2) and Dy (3)) have been synthesized by using hydrothermal method and structurally characterized by single-crystal X-ray diffraction, powder X-ray diffraction and IR spectra. Complexes 1–3 are isostructural and crystallize in the space group Cmca of orthorhombic system. Their crystal structures can be described as a kind of homeomorphism configurations with 3D framework. Magnetic measurements indicated that complex 1 exhibits antiferromagnetic behavior and magnetocaloric effect with −ΔSmmax=28.8Jkg−1K−1 (ΔH=7T and T=2K), and complex 2 exhibits field-induced slow magnetic relaxation behaviors.

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