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Bifunctional ionic metal-organic frameworks (MOFs) containing Lewis acid sites (unsaturated metal sites) and halide ions (Cl À , Br À , and I À ) have attracted increasing attention due to their extra high activity for the cycloaddition of CO 2 with epoxides. Herein, a novel microporous MOF (1-Eu), namely,dine-4-yl)pyridine), has been synthesized by using a new bipyridyl-based tetracarboxylate ligands (H 4 L). Structural analyses show that 1-Eu is a 3D framework in which 1D chains with alternating triple and single carboxylate bridges are interlinked by the L ligands and contains microporous channels with uncoordinated pyridyl N atoms, which are easy to be modified by Nmethylation. Therefore, three bifunctional N-methylation 1-Eu MOFs, 1-Eu-MeX (X = Cl À , Br À , and I À ), were successfully prepared from the 1-Eu MOF by a postsynthetic modification (PSM) method. 1-Eu-MeX can efficiently cata-

A water stable Eu3+-organic framework (1-Eu), [Eu(HL)(H2L)]·7.5H2O (H3L = 3-(3,5-dicarboxylphenyl)-4-carboxylpyridine) was constructed through solvothermal synthesis and studied by structural analyses and luminescent sensing. Crystallographic studies revealed that 1-Eu was a...

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Metal-organic frameworks (MOFs) have become preferred heterogeneous catalytic materials for many reactions due to their advantages such as porosity and abundant active sites. Here, a 3D Mn-MOF-1 [Mn2(DPP)(H2O)3]·6H2O (DPP =...