Polyoxometalate-Incorporated Metal-Organic Network as a Heterogeneous Catalyst for Selective Oxidation of Aryl Alkenes.

Selective oxidation of aryl alkenes is important for chemical synthesis reactions, in which the key lies in the rational design of efficient catalysts. Herein, four polyoxometalate (POM)-incorporated metal-organic networks, with the formulas of [Co(ttb)(HO)][SiMoO]·2HO (), [Co(ttb)(HO)][SiWO]·8HO (), [Zn(Httb)(Httb)][BWO]·9HO () and {[Zn(HO)(ttb)][Zn(HO)]}[HSiWZnO]·24HO () (ttb = 1,3,5-tri(1,2,4-triazol-1-ylmethyl)-2,4,6-trimethylbenzene), were hydrothermally synthesized and structurally characterized. Structural analysis showed that compound consists of a POM-encapsulated three-dimensional (3-D) supramolecular framework; compound is composed of a POM-supported 3-D coordination network; and compounds show POM-incorporated 3-D supramolecular networks.

A Dehydrogenative Inverse Electron Demand Diels-Alder Reaction for the Synthesis of Functionalized Pyranones.

An efficient dehydrogenative inverse electron demand Diels-Alder reaction of isopropyl and prenyl benzene derivatives with electron-deficient dienes followed by decarboxylation has been reported for the first time. The much broader substrate scope of dienophiles and electron-deficient dienes led to biologically valuable pyranones in good to excellent yields.

The Synergistic Anti-inflammatory Activity and Interaction Mechanism of Ellagic Acid and a Bioactive Tripeptide (Phe-Pro-Leu) from Walnut Meal.

The anti-inflammatory effect of the interaction between ellagic acid (EA) and a bioactive tripeptide (FPL) from walnut meal was investigated in this study. We found that lipopolysaccharide (LPS) -induced expression of nitric oxide, tumor necrosis factor-α, interleukin-6, and interleukin-1β were significantly inhibited by the interaction of EA and FPL in RAW264.7 macrophage cells.

Slow magnetic relaxation in dinuclear Co(III)-Co(II) complexes containing a five-coordinated Co(II) centre with easy-axis anisotropy.

Two air-stable Co(III)-Co(II) mixed-valence complexes of molecular formulas [CoCo(L)(DMAP)(CHCOO)]·HO·CHOH (1) and [CoCo(L)(4-Pyrrol) (CHCOO)]·0.5CHCl (2) (HL = 1,3-bis-(5-methyl pyrazole-3-carboxamide) propane; DMAP = 4-dimethylaminopyridine; and 4-Pyrrol = 4-pyrrolidinopyridine) were synthesized and characterized by single-crystal X-ray crystallography, high-field electron paramagnetic resonance (HFEPR) spectroscopy, and magnetic measurements. Both complexes possess one five-coordinated paramagnetic Co(II) ion and one six-coordinated Co(III) ion with octahedral geometry.

Volatile Flavor Compounds of (L.) Gaertn. Before and After Different Dehydration Treatments.

(L.) Gaertn (also ) is a special Mongolian vegetable, belonging to the family, growing in arid and semi-arid areas of northern China, with a unique flavor and potential health benefits. This article aims to describe the profile of volatile flavor compounds in fresh and different dehydrated samples, establish the fingerprint, and identify the characteristic compounds.

Synthesis and biological evaluation of novel artemisone-piperazine-tetronamide hybrids.

For the first time, six novel artemisone-piperazine-tetronamide hybrids (12a-f) were efficiently synthesised from dihydroartemisinin (DHA) and investigated for their cytotoxicity against some human cancer cells and benign cells. All the targets showed good cytotoxic activity . Hybrid 12a exhibited much better inhibitory activity against human liver cancer cell line SMMC-7721 (IC = 0.

A novel molybdenum disulfide nanosheet loaded Titanium/Zirconium bimetal oxide affinity probe for efficient enrichment of phosphopeptides in A549 cells.

In this paper, we developed a facile route for the preparation of a novel bimetal oxide affinity chromatography (MOAC) material. The TiO/ZrO@MoS was constructed by the electrostatic interaction between titanium oxide/zirconia (w:w, 10:1) and molybdenum disulfide nanosheet. The nanocomposite has the large specific surface area (186.

BiOBr/BiS heterojunction with S-scheme structureand oxygen defects: In-situ construction and photocatalytic behavior for reduction of CO with HO.

Constructing heterojunction has been considered as an efficient strategy to promote the separation and transfer of photogenerated carriers and improve redox ability of single photocatalyst. Herein, S-scheme BiOBr/BiS heterojunction with surface oxygen vacancies (OVs) was synthesized in situ by a facile hydrothermal method. The as-prepared photocatalyst show high activity for CO photoreduction with pure water.

The new life of traditional water treatment flocculant polyaluminum chloride (PAC): a green and efficient micro-nano reactor catalyst in alcohol solvents.

Polyaluminum chloride (PAC) is an inorganic polymer material that has the advantages of a simple preparation process and special electronic structure. It is considered to be the most efficient and widely used flocculation material for water treatment. In this work, PAC has been used as a Lewis acid catalyst in interdisciplinary fields because of its polynuclear Al-O cation structure.

Molecular Engineering of Star-Shaped Indoline Hole Transport Materials: The Influence of Planarity on the Hole Extraction and Transport Processes.

As the key properties of perovskite solar cells (PSCs), the hole extraction and transport capabilities of the hole transport material (HTM) affect the photovoltaic performance of PSCs to a considerable extent, while both capabilities can be adjusted by molecular planarity. Therefore, in this work, the molecular planarity of the HTM is systematically optimized to regulate the hole extraction and transport capabilities. Along with the improvement in planarity, the HTM's HOMO level is increased, leading to the enhancement of hole extraction capability.

First-principles calculations of 0D/2D GQDs-MoS mixed van der Waals heterojunctions for photocatalysis: a transition from type I to type II.

The fabrication of type II heterojunctions is an efficient strategy to facilitate charge separation in photocatalysis. Here, mixed dimensional 0D/2D van der Waals (vdW) heterostructures (graphene quantum dots (GQDs)-MoS) for generating hydrogen from water splitting are investigated based on density functional theory (DFT). The electronic and photocatalytic properties of three heterostructures, namely, CH-MoS, CH-MoS and CH-MoS are estimated by analyzing the density of states, charge density difference, work function, Bader charge, absorption spectra and band alignment.

A rare example of a double metamagnetic transition leading to 2D and 3D long-range order in the two-dimensional pyrazine- and azido-bridged cobalt(II) compound [Co(pyz)(N)].

The synthesis, characterization, crystal structure and detailed magnetic properties of a pyrazine (pyz) and azido (N) bridged cobalt(II) compound of formula [Co(N)(pyz)] (1) are reported. Compound 1 shows a layered structure formed by Co(II) chains with double μ-N(κN,N) bridges that are further connected by μ-(pyrazine-κN,N) bridges. The layers present weak van der Waals interactions between azido terminal groups.

Hydrolysis of Ammonia Borane on a Single Pt Atom Supported by N-Doped Graphene.

The hydrolysis of ammonia borane (NHBH or AB) at room temperature is a promising method to produce hydrogen, but the complete reaction mechanism is still less investigated. Herein, the full hydrolysis process of the AB molecule on single Pt atom coordinated by two carbon atoms and one nitrogen atom (Pt-CN) on nitrogen doped graphene is investigated using the density functional theory (DFT) method. Our results demonstrate that the rate-limiting step is the formation of *BHNH by breaking the first B-H bond in AB with an energy barrier of 0.

Transition Metal Doping Induces Ti to Promote the Performance of SrTiO @TiO Visible Light Photocatalytic Reduction of CO to Prepare C1 Product.

Transition metal Fe, Co, Ni and Cu doped strontium titanate-rich SrTiO @TiO (STO@T) materials were prepared by hydrothermal method. The prepared doped materials exhibit better photocatalytic CO reduction to CH ability under visible light conditions. Among them, Fe-doped and undoped SrTiO @TiO under visible light conditions CO reduction products only CO, while M-STO@T (M=Co, Ni, Cu) samples converted CO to CH .

The electrospun polyacrylonitrile/covalent organic framework nanofibers for efficient enrichment of trace sulfonamides residues in food samples.

In this work, the electrospun polyacrylonitrile/covalent organic frameworks Tp-BD nanofibers (PAN/Tp-BD) were synthesized and applied as an adsorbent for thin film microextraction (TFME) of seven sulfonamides in animal derived food samples. The morphology, structure, porosity, and stability of the prepared nanofibers were investigated. The PAN/Tp-BD nanofibers exhibited good chemical stability, high flexibility, porous fibrous structure, and excellent extraction efficiency.

Cp*Rh(III)-Catalyzed Regioselective C(sp)-H Mono- and Dialkynylation of Thioamides by Sulfur Coordination.

An efficient Cp*Rh(III)-catalyzed regioselective C(sp)-H mono- and dialkynylation of thioamides was described. This reaction was performed under mild conditions in high yields (up to 98%) with a broad substrate scope. Significantly, the versatility of this method was further demonstrated by controlled mono- and dialkynylation.

Dual-sensitized Eu(III)/Tb(III) complexes exhibiting tunable luminescence emission and their application in cellular-imaging.

Two novel dual-photosensitized stable complexes, namely [Eu(dpq)(BTFA)] (1) and [Tb(dpq)(BTFA)] (2), have been successfully assembled a mixed ligand approach using dipyrido[3,2-:2',3'-]quinoxaline (dpq) and 3-benzoyl-1,1,1-trifluoroacetone (BTFA). The crystallographic data reveal mononuclear lanthanide cores in both 1 and 2, in which each eight-coordinated Ln(III) ion is located in a slightly distorted dodecahedron (). The room-temperature photoluminescence spectra of complexes 1 and 2 indicate that both BTFA and dpq can effectively sensitize Eu(III) and Tb(III) characteristic luminescence.

Organocatalytic cycloaddition of alkynylindoles with azonaphthalenes for atroposelective construction of indole-based biaryls.

The axially chiral indole-aryl motifs are present in natural products and biologically active compounds as well as in chiral ligands. Atroposelective indole formation is an efficient method to construct indole-based biaryls. We report herein the result of a chiral phosphoric acid catalyzed asymmetric cycloaddition of 3-alkynylindoles with azonaphthalenes.

Copper and palladium bimetallic sub-nanoparticles were stabilized on modified polyaniline materials as an efficient catalyst to promote C-C coupling reactions in aqueous solution.

Modified polyaniline self-stabilizing Cu/Pd bimetallic sub-nanocluster composite materials (Cu/Pd@Mod-PANI-3OH) are obtained through the three steps of oxidative polymerization, structural modification, and metal self-trapping. Palladium and copper are confined and coordinated in the composite material by participating in the reaction and are highly uniformly dispersed in the carrier in the form of sub-nano clusters. The Cu/Pd@Mod-PANI-3OH micro-nano reactor catalyst formed by the self-assembly of copper, palladium and polyaniline has excellent electronic effects, including a tunable microenvironment, metal-carrier and metal-metal synergy, and the stabilizing effect of metal by polyaniline materials.

Insertion of ammonia into alkenes to build aromatic N-heterocycles.

Ammonia is one of the most abundant and simple nitrogen sources with decent stability and reactivity. Direct insertion of ammonia into a carbon skeleton is an ideal approach to building valuable N-heterocycles for extensive applications with unprecedented atom and step economy. Here, we show an electrochemical dehydrogenative method in which ammonia is inserted directly into alkenes to build aromatic N-heterocycles in a single step without the use of any external oxidant.

Efficient Extraction and Determination of Carbamate Pesticides in Vegetables Based on a Covalent Organic Frameworks with Acylamide Sites.

It is an important challenge to effectively extract and determine pesticides in complex samples. Covalent organic frameworks (COFs) are burgeoning porous crystalline organic materials with good environmental resistance, thus demonstrating great potential as adsorbents in contaminants detection. In this work, we design and synthesize a novel COF-TpDB via 1,3,5-triformylphloroglucinol (Tp) and 4,4'-diaminobenzoylanilide (DB) as well as its packed cartridge for solid phase extraction (SPE) of carbamate pesticides.

Synthesis and Characterization of Folate-Modified Cell Membrane Mimetic Copolymer Micelles for Effective Tumor Cell Internalization.

The inefficient targeting and phagocytic clearance of nanodrug delivery systems are two major obstacles in cancer therapy. Here, inspired by the special properties of zwitterionic polymers and folic acid (FA), a partly biodegradable copolymer of FA-modified poly(ε-caprolactone) block poly(2-methacryloxoethyl phosphorylcholine), PCL--PMPC-FA, was synthesized via atom transfer radical polymerization (ATRP) and click reaction. Non-FA-modified copolymer PCL--PMPC was also synthesized as a control.

Metal-free sulfonylation of arenes with -fluorobenzenesulfonimide cleavage of S-N bonds: expeditious synthesis of diarylsulfones.

A novel metal-free sulfonylation of arenes with -fluorobenzenesulfonimide (NFSI) toward the synthesis of diarylsulfones has been developed. The reaction represents a rare example of sulfonylation reaction using NFSI as an efficient sulfonyl donor and the first example of acid-mediated sulfonylation of unactivated arenes with NFSI selective cleavage of S-N bonds. This protocol provides a concise approach for the construction of pharmaceutically and biologically important diarylsulfones.

pH-Dependent formation of three porous In(III)-MOFs: framework diversity and selective gas adsorption.

pH-Dependent self-assembly and structural transformation have been observed in a series of porous In(III)-MOFs, HO[In(pta)(OH)]·10HO (NXU-1), [In(pta)]·CHN (NXU-2) and [In(pta)]·CHN (NXU-3) (Hpta = 2-(4-pyridyl)-terephthalic acid). The structural diversities of NXU-1-3 reveal that the pH value of the reaction plays a key role in the assembly of In-MOFs. NXU-1 with excellent stability exhibits highly selective CO adsorption over CH as compared to NXU-2 and NXU-3, owing to the presence of abundant multiple active sites unveiled by theoretical calculations.