Two new synthesized ultra-small copper nanoclusters, [Cu3(µ3-H)(µ2-dppy)4](ClO4)2 (1) and [Cu4(µ4-H)(µ2-dppy)4(µ2-Cl)2](ClO4) (2) (dppy=diphenyl-2-pyridylphosphine) exhibit ultrabright yellow and yellow-green room-temperature phosphorescence (RTP) emission, with high quantum yields of 71.8% and 63.5%, respectively. Therefore, nanocluster 1 is firstly applied as the single component phosphor for yellow and white light-emitting diodes (LEDs) with favourable characteristics.
A diastereo- and enantioselective rhodium(III)-catalyzed reductive cyclization of cyclohexadienone-tethered terminal alkenes and (E)-1,2-disubstituted alkenes (1,6-dienes) is reported, providing cis-bicyclic products bearing three contiguous stereocenters with good yields and high diastereo- and enantioselectivities. The kinetic resolution of racemic precursor is also achieved with good efficiency. Moreover, a subgram-scale experiment, several transformations of the cyclization product, and one-...
A novel synthetic method for enantioselective C2-functionalization of 3-hydroxychromenones promoted by N-heterocyclic carbenes via the formation of α,β-unsaturated acylazolium intermediates and occurs with Coates-Claisen rearrangement is established. This synthetic strategy enabled the rapid assembly of enantiomerically enriched δ-hydroxychromenone-derived esters/amides under mild conditions with good to excellent yields and broad substrate scope
Electrocatalytic eight-electron nitrate (NO3−) reduction is a sustainable strategy to degrade NO3− and convert it into high value-added ammonia (NH3) but needs efficient catalysts with high activity and selectivity. Our study shows the use of Ti plate supported cobalt-phosphorus alloy film (Co–P/TP) as a high-active and selective electrocatalyst for ambient NO3−-to-NH3 conversion. In 0.2 M Na2SO4 with 200 ppm NO3−, the Co–P/TP offers a NH3 yield rate of 416.0 ± 7.2 μg h–1 cm–2 and a high Faradai...
1,3-Diethynylbicyclo[1.1.0]tetrasilanes that contain an unsupported bridgehead Si-Si π-bond and ethynyl π-moieties were synthesized by the reaction of a 1,3-dihalobicyclo[1.1.0]tetrasilane with the corresponding lithium acetylide. The substantial bathochromic shift of the longest-wavelength absorption band observed for the phenylethynyl-substituted bicyclo[1.1.0]tetrasilane in the solid state compared to that of the octynyl-substituted derivative suggested the presence of effective π-conjugation...
Electrochemiluminescence (ECL) is a leading analytical technique for clinical monitoring and early disease diagnosis. Carbon nanotubes are used as efficient nanomaterials for ECL signal enhancement providing new insights into the mechanism for the ECL generation but also affording application in beads-based immunoassay and ECL microscopy-based bioimaging.
Z-scheme system was successfully constructed for visible light driven photocatalytic H2 production from lignocelluloses, the highest H2 evolution rate of this Z-scheme system achieves 5.3 and 1.6 μmol•h-1 in α-celluloses and poplar wood chip aqueous solution, respectively, under visible light irradiation.
We reported herein the first example of N3 radical-mediated azidosulfonylation of alkynes, affording the β-azidovinyl sulfone products in broad substrate scope, excellent functional group compatibility, and high yield. DFT calculations suggested that the mechanism of the reaction proceeds through an unprecedented sequential N3 radical addition and sulfonyl radical coupling pathway.
A palladium-catalyzed remote C–H silylation reaction has been developed through vinylic to aryl 1,4-palladium migration. By using alkyne-tethered aryl iodides as the starting materials and hexamethyldisilane as the silylating reagent, the reaction involves cascade intramolecular carbopalladation, 1,4-palladium migration, and silylation with hexamethyldisilane, and forms exocyclic alkene-containing 5-silylisoquinolines as the final products.
A soluble organoselenide compound, phenyl diselenide (PDSe), is employed as a soluble electrolyte additive to enhance the kinetics of sulfurized polyacrylonitrile cathode, in which radical exchange in the solid-liquid interface form dynamic S-Se bonds. Consequently, the PDSe assisted S@pPAN cathode exhibits enhanced battery performance in both ether and carbonate-based electrolytes.