Abstract
Four lanthanide metal–organic frameworks, namely, [{[Ln5(bptc)3(Hbptc)(H2O)12]·4H2O}n (Ln=Eu, 1; Gd, 2; Tb, 3) and {[Eu(bptc′)]}n (4), (H4bptc=2,2′-bipyridine-3,3′,6,6′-tetracarboxylic acid, H3bptc′=2,2′-bipyridine-3,6,6′-tricarboxylic acid) have been hydrothermally synthesized. Compounds 1–4 were structurally characterized by IR spectra, thermogravimetric analyses and single-crystal X-ray diffractions. Complexes 1–3 are the isostructural 2D layered structures, five crystallographic independent Eu(III) ions display the two different kinds of coordination environments. Complex 4 exhibits a 3D framework structure, while H4bptc was decarboxylated to transform into the tricarboxylate group of bptc′3− in the presence of Cu2+ ions under the hydrothermal conditions. The solid state fluorescent properties of 1, 3 and 4 were investigated at room temperature, respectively.
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