Novel four-membered NHCs containing a carbamide backbone rapidly form the respective carbene dimers in quantitative yield. Thermal fragmentations are rationalized with the help of quantum chemical calculations.
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Water-soluble and air-stable gold nanoparticles stabilized by a xyloside-based ligand containing a pyridine ring-functionalized 1,2,3-triazole backbone were prepared in the presence of a reducing agent. During their preparation, UV-vis and NMR spectroscopic techniques were used to study the interaction between the xyloside ligand and Au(III) ions. These AuNPs were characterized by UV-vis spectroscopy, TEM and DLS and showed a very small size (average diameter < 10 nm determined by TEM). Their catalytic activity was probed in water for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP).Zum Volltext
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