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-
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.