[μ-1,2-Bis(4-pyrid­yl)ethane-κ2 N:N′]bis­[(4′-phenyl-2,2′:6′,2′′-terpyridine-κ3 N,N′,N′′)silver(I)] bis­(trifluoro­methane­sulfonate)

In the title compound, [Ag2(C12H12N2)(C21H15N3)2](CF3SO3)2, the AgI atom is coordinated by three N atoms of one 4′-phenyl-2,2′:6′,2′′-terpyridine (phtpy) ligand and one pyridyl N atom of the 1,2-bis­(4-pyrid­yl)ethane (bpe) ligand, displaying a distorted square-planar geometry. Two AgI atoms are bridged by one trans-bpe ligand, generating a dinuclear cation. The dinuclear cation is located on a centre of inversion, which is in the middle of the ethyl­ene fragment of the bpe ligand. In the crystal, the pyridyl rings of neighboring dinuclear units are stacked by π–π inter­actions with centroid–centroid distances of 3.667 (2) and 3.835 (2) Å. The F and O atoms of the CF3SO3 − anions are involved in inter­molecular C—H⋯F and C—H⋯O hydrogen-bonding inter­actions, respectively, with –CH groups from the phtpy ligands

Study on the Performance and Corrosion Failure Process of Porous Titanium-Based Coated Electrodes

Titanium-based coated electrodes are considered to be a substitute for Pb-based anodes because of their lower weights and lower energy consumption; however, their properties and service lives are affected by the matrix structure. Herein, the metal oxide coating was prepared via the thermal oxidation decomposition of a 5 μm-porous titanium plate. The scanning electron microscope (SEM) showed that the metal oxide coating on the porous titanium plate was strengthened in each layer that had pores. The inner coating of the particles are sized using nanometers, with a diameter of 22–64 nm and a compact structure. The electrochemical test results show that, compared with the flat titanium plate, the coating attached to the porous titanium plate has a better catalytic performance in the chlorine evolution reaction, (the chlorine evolution potential decreases by 121 mV), and the service life is increased by 3.78 times. Through a SEM, XRD, and EDS analysis of the coating composition after corrosion failure, the corrosion mechanism of the surface oxide coating was discussed

Study on the Performance and Corrosion Failure Process of Porous Titanium-Based Coated Electrodes

Titanium-based coated electrodes are considered to be a substitute for Pb-based anodes because of their lower weights and lower energy consumption; however, their properties and service lives are affected by the matrix structure. Herein, the metal oxide coating was prepared via the thermal oxidation decomposition of a 5 μm-porous titanium plate. The scanning electron microscope (SEM) showed that the metal oxide coating on the porous titanium plate was strengthened in each layer that had pores. The inner coating of the particles are sized using nanometers, with a diameter of 22–64 nm and a compact structure. The electrochemical test results show that, compared with the flat titanium plate, the coating attached to the porous titanium plate has a better catalytic performance in the chlorine evolution reaction, (the chlorine evolution potential decreases by 121 mV), and the service life is increased by 3.78 times. Through a SEM, XRD, and EDS analysis of the coating composition after corrosion failure, the corrosion mechanism of the surface oxide coating was discussed

Rare Metal Mat. Eng.

The Al/Pb-0.3wt%Ag-0.01wt%Co and Al/Pb-0.3wt%Ag composite anode materials were prepared by electrodeposition. The electrochemical properties of the composite anode in 50 g/L Zn2+ and 150 g/L H2SO4 solutions were investigated by anode polarization curves, cyclic voltammetry (CV) curves and Tafel curves. The surface structure was characterized by SEM and EDS. The results show that the cobalt addition can reduce the oxygen evolution potential and improve the corrosion resistance. Compared with cast Pb-0.3wt%Ag, the anodized layer of the Al/Pb-0.3wt%Ag and Al/Pb-0.3wt%Ag-0.01wt%Co are more dense, the grains are finer.The Al/Pb-0.3wt%Ag-0.01wt%Co and Al/Pb-0.3wt%Ag composite anode materials were prepared by electrodeposition. The electrochemical properties of the composite anode in 50 g/L Zn2+ and 150 g/L H2SO4 solutions were investigated by anode polarization curves, cyclic voltammetry (CV) curves and Tafel curves. The surface structure was characterized by SEM and EDS. The results show that the cobalt addition can reduce the oxygen evolution potential and improve the corrosion resistance. Compared with cast Pb-0.3wt%Ag, the anodized layer of the Al/Pb-0.3wt%Ag and Al/Pb-0.3wt%Ag-0.01wt%Co are more dense, the grains are finer

electrosynthesisofalpbpbo2compositeinertanodematerials

利用恒电流从碱性镀液中在Al/Pb表面电化学合成α-PbO 2沉积层,制备出Al/Pb/α-PbO 2复合惰性阳极材料。通过阳极极化法考察α-PbO 2镀液组成及镀液温度对在Al/Pb表面电化学合成α-PbO 2的影响,采用XRD和SEM分别测试Al/Pb基体材料及α-Pb O2沉积层的相结构和表面微观组织特征。结果表明：α-PbO 2的电化学合成分由几个不同的步骤完成;适宜的条件能有效提高α-Pb O2电化学合成速率并避免析氧副反应的发生;从碱性溶液中合成的α-Pb O2具有斜方晶型结构,沉积层由发育良好的圆球形晶胞构成

Synthesis, Biological Evaluation, and Docking Studies of a Novel Sulfonamido-Based Gallate as Pro-Chondrogenic Agent for the Treatment of Cartilage

Gallic acid (GA) and its derivatives are anti-inflammatory agents and are reported to have potent effects on Osteoarthritis (OA) treatment. Nonetheless, it is generally accepted that the therapeutic effect and biocompatibility of GA is much weaker than its esters due to the high hydrophilicity. The therapeutic effect of GA on OA could be improved if certain structural modifications were made to increase its hydrophobicity. In this study, a novel sulfonamido-based gallate was synthesized by bonding sulfonamide with GA, and its biological evaluations on OA were investigated. Results show that 5-[4-(Pyrimidin-2-ylsulfamoylphenyl)]-carbamoyl-benzene-1,2,3-triyl triacetate (HAMDC) was able to reverse the effects induced by Interleukin-1 (IL-1) stimulation, and it also had a great effect on chondro-protection via promoting cell proliferation and maintaining the phenotype of articular chondrocytes, as well as enhancing synthesis of cartilage specific markers such as aggrecan, collagen II and Sox9. Furthermore, a docking study showed that HAMDC fits into the core of the active site of a disintegrin and metalloproteinase with thrombospondin motifs 5 (ADAMTS-5), which provides an explanation for its activity and selectivity

Al/Pb/α-PbO_2复合惰性阳极材料的电化学合成

利用恒电流从碱性镀液中在Al/Pb表面电化学合成α-PbO 2沉积层,制备出Al/Pb/α-PbO 2复合惰性阳极材料。通过阳极极化法考察α-PbO 2镀液组成及镀液温度对在Al/Pb表面电化学合成α-PbO 2的影响,采用XRD和SEM分别测试Al/Pb基体材料及α-Pb O2沉积层的相结构和表面微观组织特征。结果表明：α-PbO 2的电化学合成分由几个不同的步骤完成;适宜的条件能有效提高α-Pb O2电化学合成速率并避免析氧副反应的发生;从碱性溶液中合成的α-Pb O2具有斜方晶型结构,沉积层由发育良好的圆球形晶胞构成

Electrolyte Additive Strategies for Suppression of Zinc Dendrites in Aqueous Zinc-Ion Batteries

Aqueous zinc-ion batteries (ZIBs) with metal zinc as the anode possess the features of safety, environmental friendliness, and high specific capacity, which have attracted a great deal of attention in the past few years. The accompanying zinc dendrites are an important problem that endangers the battery performance. Therefore, the extensive research on the suppression strategies of Zn dendrites reflects a positive effect on improving the performance of ZIBs. In particular, the electrolyte additives (EAs) approach is considered a simple, reliable, and low-cost strategy to address the zinc dendritic issues and can inhibit or alleviate the growth of zinc dendrites while facilitating the amelioration of adverse reactions. In this review, the principles and processes of zinc dendrites, corrosion passivation, and hydrogen evolution side reactions on zinc anodes of ZIBs are firstly categorized. Then, the mitigation and inhibition of zinc dendrites and side reactions via different kinds of EAs are elaborated according to the regulation strategies of EAs, which provides an overview of the research on EAs conducted in recent years and proposed strategies to solve zinc dendrites and other problems. Finally, a reasonable outlook on the future improvement and development of EAs for ZIBs is described, which could provide some guidance for the evolution and design of EAs in the future

Nickel-catalyzed enantioselective annulation/alkynylation and Sonogashira reaction to form C(sp3)-C(sp) and C(sp2)-C(sp) bonds, respectively

While traditional Sonogashira reaction requires a palladium catalyst and a copper co-catalyst, some recent variants were reported being promoted by single transition metals. Here we report a single nickel-catalyzed tandem Heck-Sonogashira annulation/alkynylation for enantioselectively constructing C(sp3)-C(sp) bond. In addition, using the same catalytic system, Sonogashira C(sp2)-C(sp) cross-coupling has also been achieved. The alkynylations described in this report are important for the three reasons: 1. C(sp3)/(sp2)-C(sp) bonds exist in many bioactive natural products and drug molecules as well as their key synthetic intermediates; 2. There was no precedent for single nickel-catalyzed Sonogashira reaction owing to the difficulties caused by strong coordination of nickel to the triple bond to inactivate the catalyst; 3. Isolation and characterization of single-crystal structure of a resting state intermediate, di-phosphine chelated σ-alkyl-NiII-I complex, which provided crucial evidence to support the mechanistic postulation and guided DFT calculations

Two new coumarins from the bark of <i>Streblus indicus</i> (Bur.) Corner

<p>Two new coumarins 7-<i>O</i>-(6-<i>O</i>-(5-<i>O</i>-3,4,5-tri-methoxycinnamate-<i>β</i>-d-apiofuranosyl-<i>β</i>-d-glucopyranosyl)-6-methoxy coumarin (<b>1</b>) and 7-<i>O</i>-(6-<i>O</i>-(4-(2-hydroxy-1-hydroxymethyl-ethoxy)-3-methoxy-cinnamyl)-<i>β</i>-d-glucopyranosyl)-6-methoxy coumarin (<b>2</b>), along with 10 known metabolites, were isolated from the bark of <i>Streblus indicus</i>, their structures were identified by comparison of experimental and published spectroscopic data. (<i>S</i>)-marmesinin (<b>6</b>) and scoparone (<b>7</b>) exhibited moderate antimicrobial activity <i>in vitro</i> against <i>Staphylococcus aureus</i> strain with the MIC values of 62.5 and 125.0 μg/mL, respectively. Betulinic acid showed inhibitory activity <i>in vitro</i> against MCF-7 cell with IC₅₀ value of 9.5 ± 0.1 μM.</p