title: Lanthanide Metal-Organic Frameworks with Six-Coordinated Ln(III) Ions and Free Functional Organic Sites for Adsorptions and Extensive Catalytic Activities.
abstract: Three chelating-amino-functionalized lanthanide metal-organic frameworks, Y-DDQ, Dy-DDQ and Eu-DDQ, were synthesized with a flexible dicarboxylate ligand based on quinoxaline (H2DDQ = N, N'-dibenzoic acid-2,3-diaminoquinoxaline). The three-dimensional framework is constructed by the H2DDQ linkers connecting the zigzag ladders, showing a net of sra topology. In the structures, one kind of Ln(III) ions metal centers are six-coordinated and thus can potentially behave as open metal sites (OMSs), while the free chelating amino groups can act as free functional organic sites (FOSs). The N2 and Ar adsorption behaviors indicate that these Ln-DDQ exhibits stable microporous frameworks with high surface area after remove of the solvents. Owing to presence of OMSs and FOSs, these MOFs show good ability of CO2, dyes captures and Lewis acid catalyst for cyanosilylation reaction. In view of the existing FOSs in the framework, Pd NPs were immobilized onto the MOFs through graft interactions between free chelating amino groups and metal ions precursor using postsynthetic modification. The well dispersed Pd@Ln-DDQs exhibit efficient and recyclable catalytic reduction of 4-nitrophenol to 4-aminophenol, and they can also act as an excellent catalyst for Suzuki-Miyaura cross-coupling reactions with the exposed Pd NPs.
authors.affiliation: College of Pharmacy and Chemistry &Chemical Engineering, Taizhou University, Taizhou, 225300, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhu
authors.affiliation: Hanlin College, Nanjing University of Chinese Medicine, Taizhou, 225300, China.
authors.forename: Min
authors.initials: M
authors.lastname: Zhu
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, China.
authors.forename: Li
authors.initials: L
authors.lastname: Xia
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, China.
authors.forename: Yunlong
authors.initials: Y
authors.lastname: Wu
authors.affiliation: College of Pharmacy and Chemistry &Chemical Engineering, Taizhou University, Taizhou, 225300, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Hua
authors.affiliation: School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, China.
authors.forename: Jimin
authors.initials: J
authors.lastname: Xie