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Adopting a mixed ligand strategy, a novel fluorescent chain-based 3D metal–organic framework, [Zn(BPTC)0.5(Tz)]·DMF·CH3OH (1), has been synthesized by the solvothermal method. The obtained hybrid has two kinds of 1D channel, one of which is surrounded by the uncoordinated nitrogens of Tz ligands. Owing to the well-isolated feature of tetrazole moieties within the framework, compound 1 is greatly armed with accessible recognition sites, which exhibits a turn-off luminescence sensing for Cu2+ ions. Besides, thanks to the mono-dentate oxygen atom of the carboxylic group, compound 1 could absorb a similar number of Ln3+ ions and manifests selective sensitization of different Ln3+ ions. [ABSTRACT FROM AUTHOR]

Assembly of cucurbit[6] and a {Cd2Ge8V12O48} cluster produced two rotaxane-shaped and polyrotaxane-shaped solids by changing the ratio of starting precursors in the system. The high oxygen density of the polyoxoanion surface provides active sites to extend a single rotaxane-shaped hybrid 1 to a 1D polyrotaxane-shaped hybrid 2. This construction strategy may afford an entirely new methodology for polyoxometalate-based hybrid chemistry. [ABSTRACT FROM AUTHOR]

Three polyoxovanadate-based metal–organic polyhedra (denoted as VMOP-1, -2, and -3), adopting isostructural discrete octahedral cage geometries, were successfully synthesized under solvothermal conditions. These structures are all built up from the same pentavanadate {V5O9Cl} cluster connected by linear bidentate ligands (H2L1 = H2BDC, H2L2 = H2BDC-NH2, H2L3 = H2BDC-Br), respectively. [ABSTRACT FROM AUTHOR]

Different from the conventional synthesis approaches, such as hydrothermal or solvothermal synthesis, a porous metal azolate framework encapsulating Keggin-type [SiW12O40]4− anions was prepared by an environmentally friendly, low-cost, and highly efficient steam-assisted conversion method for the first time. The nanosized polyoxometalates as a template were encapsulated by a zeotype 6448 cage constructed by 28 nuclear zinc atoms connected through 32 Trz ligands. The obtained composite exhibits excellent thermal and chemical stability; meanwhile, its special ability to selectively absorb water from alcohols makes it efficiently separate water from analytically pure ethanol, with the result that water content decreases from 0.23 to 0.05 wt %, which is superior to the standard of chromatographic grade ethanol (<0.1 wt %). Besides, alternating current (ac) impedance experiments also reveal that the hybrid is a kind of proton conductive material. [ABSTRACT FROM AUTHOR]

A stable luminescent anionic metal–organic framework with unprecedented topological structure was constructed, which showed a certain degree of framework stability in water and acid/base solutions. Furthermore, the compound showed moderate CO2 adsorption and extremely selective detection of 2,4,6-trinitrophenol (TNP) in both an organic solvent and aqueous solution. [ABSTRACT FROM AUTHOR]

Due to the high theoretical capability, copper-based oxides were widely investigated. A facile water bath method was used to synthesis CuO nanowires and CuO/Cu 2 O/Cu nanocomposites. Owing to the synergetic effect, the CuO/Cu 2 O/Cu nanocomposites exhibit superior electrochemical performance compared to the CuO nanowires. The initial discharge and charge capacities are 2,660.4 mAh/g and 2,107.8 mAh/g, and the reversible capacity is 1,265.7 mAh/g after 200 cycles at 200 mA/g. Moreover, the reversible capacity is 1,180 mAh/g at 800 mA/g and 1,750 mAh/g when back to 100 mA/g, indicating the excellent rate capability. The CuO/Cu 2 O/Cu nanocomposites also exhibit relatively high electric conductivity and lithium-ion diffusion coefficient, especially after cycling. For the energy storage mechanism, the capacitive controlled mechanism is predominance at the high scan rates, which is consistent with the excellent rate capability. The outstanding electrochemical performance of the CuO/Cu 2 O/Cu nanocomposites indicates the potential application of copper-based oxides nanomaterials in future lithium-ion batteries., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Wang, Gao, Ren, Zhou and Qin.)

CuS and Cu 1.8 S have been investigated respectively as anodes of lithium-ion batteries because of their abundant resources, no environment pollution, good electrical conductivity, and a stable discharge voltage plateau. In this work, CuS/Cu 1.8 S nanocomposites were firstly prepared simultaneously by the one-pot synthesis method at a relatively higher reaction temperature 200 °C. The CuS/Cu 1.8 S nanocomposites anodes exhibited a high initial discharge capacity, an excellent reversible rate capability, and remarkable cycle stability at a high current density, which could be due to the nano-size of the CuS/Cu 1.8 S nanocomposites and the assistance of Cu 1.8 S. The high electrochemical performance of the CuS/Cu 1.8 S nanocomposites indicated that the Cu x S nanomaterials will be a potential lithium-ion battery anode.

A stable metal-organic framework pillared by Keggin-type polyoxometalate, Cu6 (Trz)10 (H2O)4 [H2 SiW12 O40 ]⋅8 H2O (Trz=1,2,4-triazole) (1), has been prepared under hydrothermal condition. The 2D layer structure with a 22-member ring was formed by Cu(2+) ions, which are connected with each other via the Trz ligands on the ab plane. Thus, the 2D layers are further interconnected through Keggin polyoxoanions to generate a 3D porous network with a small 1D channel. Moreover, the presence of polyoxoanions make it exhibit selective adsorption of water and proton-conducting properties. Additionally it showed efficient intrinsic peroxidase-like activity, providing a simple and sensitive colorimetric assay to detect H2O2 ., (© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)