Bowen Cong

Assembly of six [HxAs2Mo6O26](6−x)− cluster-based hybrid materials from 1D chains to 3D framework with multiple Cu–N complexes

A series of organic–inorganic hybrid compounds, [{Cu(4,4′-bipy)1.5(H2O)2}2{H2As2Mo6O26}] (1), [{Cu (biim)2}2{HAs2Mo6O26}{Cu(biim)Cl}]·H2O (2), (H2bib)[{Cu(H2O)2(bib)}{H2As2Mo6O26}]·2H2O (3), [{(Hbix)Cu(bix)0.5}2{As2Mo6O26}]·2H2O (4), [{Cu(bmb)1.5(H2O)}2{H2As2Mo6O26}]·2H2O (5), 0 and [{Cu2(bth)4}{H2As2Mo6O26}]·H2O (6) (4,4′-bipy = 4,4′-bipyridine; biim = biimidazole; bib = 1,4-bis(1-imidazolyl)benzene; bix = 1,4-bis(imidazol-1-ylmethyl)benzene; bmb = 1,4-bis(benzimidazol-1-yl)benzene; bth = 1,6-bis(1,2,4-triazol-lyl)hexane), were hydro-thermally synthesized and structurally characterized via elemental analysis, TG, IR, XPS, XRD, and single-crystal X-ray diffraction. The crystal structures 1–6 are formed by metal–organic complexes and the [HxAs2Mo6O26](6−x)− cluster. Compounds 1–2 feature infinite 1D-chain structures. Compounds 3–5 form 2D-layer structures in which Cu cations are five-, six-coordinated with polyoxoanions and organic ligands. Notably, compound 6 introduces the POM system into a metal–organic framework (MOF) to form a unique POMOF {42·611·82}{42·64}{44·69·7·8} topological structure. The coordination modes of the [HxAs2Mo6O26](6−x)− cluster in compounds 2, 5 and 6 are reported for the first time. The photocatalytic properties of 1–6 are studied for the decomposition of methylene blue (MB) under UV light. In addition, all the compounds exhibit good electrocatalytic performances for the reduction of nitrite.

A new 3D POMOF with two channels consisting of Wells–Dawson arsenotungstate and {Cl4Cu10(pz)11} complexes: synthesis, crystal structure, and properties

Herein, a new 3D POMOF [{Cl4Cu10(pz)11}{As2W18O62}]·1.5H2O (pz = pyrazine) (1) has been synthesized using a hydrothermal reaction, and characterized by single-crystal X-ray diffraction analysis, elemental analysis, IR, TG, and UV-vis-NIR spectroscopy, XPS, BET analysis and XRD. Single crystal X-ray analysis reveals that compound 1 consists of the classical Wells–Dawson [As2W18O62]6− polyoxoanion and {Cl4Cu10(pz)11} complexes. Compound 1 possesses two different channels which form a 3D topology framework with the Schlafli symbol of {3·4·56·67}2{3·46·53}2{32·42·56·65}. Additionally, compound 1 shows photoluminescence properties and excellent photocatalytic activity for the degradation of RhB dye under UV irradiation. The photocatalytic reaction kinetics and mechanism have been also investigated.

A novel 3D POMOF based on Wells–Dawson arsenomolybdates with excellent photocatalytic and lithium-ion battery performance

Herein, a novel POMOF based on Wells–Dawson arsenomolybdate (AM), with the formula [{Cu(btp)2}3{As2Mo18O62}] (btp = 1,3-bis(1,2,4-triazol-1-yl)propane) (1), was synthesized under hydrothermal conditions and structurally characterized by single crystal X-ray diffraction, elemental analysis, IR spectroscopy, XPS, PXRD, TG analysis, UV-vis-NIR spectroscopy, and BET analysis. It is interesting that the [As2Mo18O62]6− polyoxoanion as a hexa-connector is encapsulated with {Cu-btp} complexes to form a 3D POMOF. The 3D topological network has the Schlafli symbol of {46·55·62·72}3{46·56·73}. Compound 1 shows excellent stability in air, different pH aqueous solutions and common organic solvents. Compound 1 also exhibits fluorescence properties and efficient and stable photocatalytic activity for the degradation of MB and RhB under UV irradiation. In addition, the electrochemical performance of the designed Wells–Dawson AM as the anode material for lithium-ion batteries (LIBs) has also been evaluated. For the 1st cycle, the reversible capacity of compound 1 is about 1050 mA h g−1 at a current density of 100 mA g−1 and is maintained at around 870 mA h g−1 after 240 cycles.

Synthesis and photo-/electro-catalytic properties of a 3-D supramolecular framework based on [HxAs2Mo6O26](6−x)− and {Cu-diz} complexes

Abstract Herein, an arsenomolybdate, {Cu(diz)4(H2O)2}[{Cu(diz)2(H2O)2}2{As2Mo6O26}]·2H2O (diz = 1,2-diazole) (1), has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, elemental analysis, IR, TG, XPS, PXRD, and UV–Vis-NIR. The {Cu-diz} complexes link the [As2Mo6O26]6− polyoxoanions, forming a 1-D infinite chain. The 2-D layer is constructed from 1-D chains through hydrogen bonds. Adjacent layers and free {Cu(diz)4(H2O)2} complexes are fused through hydrogen bonding to form a 3-D topological framework with symbol of {414·610·84}{4}2. Compound 1 exhibits luminescence at room temperature, excellent degradation activity for four different organic dyes (RhB, MB, MO, and AP) under UV irradiation. The photocatalytic mechanism of 1 is discussed in detail. Furthermore, the electrocatalytic activity of 1 toward hydrogen peroxide has also been studied.

The New Arsenomolybdate Based on Monocapped Trivacant Keggin {H4AsIIIAsVMo9O34} Cluster and Cu–abi Complex: Synthesis, Structure, Photoluminescence and Catalysis Properties

A new organic–inorganic hybrid arsenomolybdate, formulated as, [{Cu(abi){H4AsIIIAsVMo9O34}](abi)4[Cu(abi)2]·H2O (1) (abi = 2-aminobenzimidazole) has been hydrothermally synthesized and structurally characterized by the elemental analysis, TG, IR, XRD, UV and single-crystal X-ray diffraction. Compound 1 represents the first example of monocapped trivacant Keggin {H4AsIIIAsVMo9O34}2− cluster as polydentate ligand linked to Cu–abi complexes and abi ligands through one covalent bond and fourteen hydrogen bonds. Compound 1 possesses two different four rings, which forms a 3D topology framework with schläfli symbol of {46·6·8·1820}{4}2{6}2{8}3. The photoluminescence and photocatalysis properties of 1 have been investigated. Moreover, we performed evaluation on its catalytic activity towards the hydrolysis of ethylene carbonate to produce ethylene glycol.