Abstract
Five new two-dimensional (2D) lanthanide–organic frameworks with formula [Ln(Hbtca)2(OAc)(H2O)]n (Ln = Sm 1, Eu 2, Gd 3, Tb 4, Er 5; H2btca = benzotriazole-5-carboxylic acid) have been synthesized by the solvothermal reactions of H2btca and corresponding lanthanide nitrate. X-ray diffraction analysis reveals that these complexes are isostructural and each exhibits a 2D square-grid-type network constructed via Ln2(μ-CH3COO)2 dinuclear secondary building units (SBUs), in which Hbtca− anions adopt two different resonance structures. The 2D networks are further linked by hydrogen-bonding to form a three-dimensional supramolecular network. Compounds 2 and 4 exhibit strong luminescence emission in the visible region. Magnetic susceptibility of 3 reveals weak antiferromagnetic interactions between the Gd(III) ions. Furthermore, infrared (IR), thermogravimetric analysis (TGA), elemental analyses (EA), and powder X-ray diffraction (PXRD) properties of these compounds are also investigated.
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