A superhydrophobic cotton fabric is prepared by introducing a commercially available fluorinated acrylate monomer, 1H,1H,2H,2H-nonafluorohexyl-1-acrylate, onto cotton fabric under simultaneous radiation-induced graft polymerization. The superhydrophobic cotton fabric shows good laundering durability, whereby the superhydrophobicity is well kept after 50 individual accelerated launderings, which is equivalent to 250 commercial launderings or domestic launderings.
An electrochemical insertion reaction of diazo compounds into C–S and C–O bonds with electricity as the oxidant under metal- and ligand-free conditions is reported.
The photoluminescence properties of ultrathin CdSe layer were reported in this paper. Several monolayers of CdSe well layer were deposited in ZnSe matrix by lower-pressure metalorganic chemical vapor deposition. Two peaks were observed in the ultrathin structure. It was considered that the high-energy peak came from the exciton combination in the ultrathin CdSe well layer and the low-energy peak might come from the interface or impurity. The decrease of growth periods could lead the peak value of exciton peak red shift and the full-width at half-maximum become narrow. This was codetermined by the effect of interdiffusion and interface roughness or well width fluctuation.
Employing density functional theory (DFT) calculations, we explore the excellent performance of two-dimensional (2D) semiconductor In2Te5 in photocatalytic water splitting at the theoretical level. The calculated results illustrate that 2D In2Te5 is a direct band gap semiconductor with a moderate band gap value and an ultrahigh optical absorption coefficient in the visible light region. It was found that its conduction band edge is higher than the reduction potential of water (-4.44 eV), which proves that it can split water to produce hydrogen. Furthermore, its excellent hydrogen evolution activity can be tuned under an appropriate biaxial strain. In addition, 2D In2Te5 shows a remarkable photo-generated current, suggesting that electrons and holes can be separated efficiently. Our results offer a superior candidate material for realizing photocatalytic water splitting for hydrogen evolution.
Herein, we reported an efficient and facile visible-light-induced 3-alkyl chromone synthesis from easily accessible o-hydroxyaryl enaminones and α-diazo esters. In this protocol, excellent yields were obtained with a broad substrate scope at room temperature, tolerating various functional groups. Of note is that this eco-friendly methodology features catalyst- and additive-free, mild reaction conditions, simple operation procedure, and easy scale-up, which affords a convenient pathway for the preparation of 3-alkyl chromones. Experimental results and density functional theory (DFT) computation analyses confirm the participation of carbene species and active cyclopropane intermediate.
Silica microspheres (SMs) feature non-toxic and high chemical stability, which have a wide range of applications in sensors, photosensitive emulsion and medicine. However, applying SMs as catalysts for synthesis of fine chemicals in organic and medical chemistry field has few been reported before. In this work, SMs were efficiently synthesized through hydrolysis and polycondensation reaction of ethyl orthosilicate (TEOS) in an alkaline system, and the surface modified SMs catalysts were successfully prepared by the impregnation method. The surface modified SMs catalyzed X−H (X = C, O, N, S) and C−C bonds insertion reactions from various diazo compounds with acyclic and cyclic 1,3-dicarbonyl compounds, arylamines and thiophenols were reported, giving the corresponding products in moderate to excellent yields. The modified species played the key role in the reactions and were identified as the catalytic active species. HRTEM and XRD revealed that the modified species are highly dispersed on the modified SMs surface.
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