Yunlong Wu

Lanthanide Metal-Organic Frameworks with Six-Coordinated Ln(III) Ions and Free Functional Organic Sites for Adsorptions and Extensive Catalytic Activities

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.

Cage-like pores of a metal–organic framework for separations and encapsulation of Pd nanoparticles for efficient catalysis

A porous metal–organic framework, {[Zn(BDC)1/2(trz)]·DMAC}n (Zn-BDC), was synthesized hydrothermally with the decomposition of 2,3-di(1,2,4-triazole)quinoxaline ligand (H2BDC = 1,4-benzenedicarboxylic acid; Htrz = 1,2,4-1H-triazole). Structural analysis indicates the porosity of Zn-BDC with distorted oblong cages. Gas adsorption studies of N2 and Ar on activated Zn-BDC reveal the BET surface areas of 587.3 and 519.5 m2 g−1, respectively. Considering the certain size of the cages, Zn-BDC can separate organic compounds with different sizes through a MOF-column chromatographic method and deliver 5-fluorouracil, which can act as an anticancer drug. Zn-BDC has also been employed as a support for Pd nanoparticles. The results of catalytic hydrogenation of 4-nitrophenol demonstrate that the catalytic activity of Pd@Zn-BDC is superior enough compared to most Pd catalysts reported.

Syntheses, crystal structures, and properties of two dinuclear iron(III) complexes constructed with 1,2,3,5-benzenetetracarboxylic acid and chelating N-donor auxiliary coligands

Abstract Two dinuclear Fe(III) metal–organic complexes with tetracarboxylate and chelating N-donor ligands, [Fe(Hbtec)(phen)(H2O)]2·2H2O (1) and [Fe(Hbtec)(bpy)(H2O)]2·2H2O (2) (H4btec = 1,2,3,5-benzenetetracarboxylic acid, phen = 1,10-phenanthroline, bpy = 2,2′-bipyridine) have been prepared and characterized by elemental analysis, IR spectroscopic, and X-ray diffraction methods. Both complexes crystallize in the monoclinic space group P21/c with two Fe(III) ions bridged by two Hbtec3− ligands into a dinuclear unit. Hydrogen bonding connects the dinuclear units into a 3-D framework. The dinuclear units are 10-connected nodes that produce a 3-D framework with topology Schläfli symbol as (312·428·55). Thermal stabilities and luminescent properties of the two complexes have also been investigated.

Three coordination compounds based on benzene tetracarboxylate ligand: syntheses, structures, thermal behaviors and luminescence properties

Using 1,2,3,5-benzenetetracarboxylic acid and different pyridyl ligands, three metal-organic coordination compounds, [

Two chelating-amino-functionalized lanthanide metal-organic frameworks for adsorption and catalysis.

\hbox {Co(H}_{3}\hbox {btec})(1{,}{10}\hbox {-phen})(\hbox {H}_{2}\hbox {O})_{3}

Syntheses, crystal structures and properties of four novel coordination polymers assembled from versatile 1,2,3,5-benzenetetracarboxylic acid

Co(H3btec)(1,10-phen)(H2O)3][OH]

Two Gd(III) coordination polymers based on a flexible tricarboxylate: Syntheses, structures, luminescence and catalytic properties

\cdot 2\hbox {H}_{2}\hbox {O}