Manji.6

Polymeric carbon nitride is widely treated as a single graphitic C3N4 phase, yet thermally condensed materials are better described as hydrogen-containing melon frameworks that can adopt several closely related structural states. How these metastable ...

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One‐pot Friedel‐Crafts and C−H/C−O coupling reactions catalyzed by B(C₆F₅)₃ were achieved for the reactions between a series of dialkylanilines and vinyl ethers with good isolated yields. The possible reaction mechanism was proposed based on theoretical and experimental studies.

Abstract

Tandem Friedel‐Crafts (FC) and C−H/C−O coupling reactions catalyzed by tris(pentafluorophenyl) borane (B(C₆F₅)₃) were achieved without using any other additive in the absence of solvent. This process can be used for the reactions between a series of dialkylanilines and vinyl ethers with good isolated yields of bis(4‐dialkylaminophenyl) compounds. Based on combined theoretical and experimental studies, the possible reaction mechanism was proposed. B(C₆F₅)₃ can activate the C=C and C−O bond for FC and C−H/C−O coupling reactions respectively. The FC reaction is slow, which is followed by a fast C−H/C−O coupling.

We describe a systematic investigation of carbon dots (C-dots) assemblies fabricated at the liquid/air interface because of the surface tension gradient. This gradient is originally created by capillary action and increased by addition of sodium dodecyl sulfate (SDS) surfactant or 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) phospholipid to the surface of C-dots aqueous mixture. The arrangement of carbon dots in liquid bulk phase (before self-assembly) and at the surface region (after self-assembly) was examined by TEM microscopy. The presence of SDS surfactant and POPC phospholipid at the air/water interface induced the C-dots compression. In addition, molecular dynamics simulation was conducted to obtain the structure of C-dots at liquid/vapor interface. The orientation of C-dots is evaluated quantitatively at water/vapor surface by using bivariate analysis.