On-Surface Carbon Nitride Growth from Polymerization of 2,5,8-Triazido--heptazine.

Carbon nitrides have recently come into focus for photo- and thermal catalysis, both as support materials for metal nanoparticles as well as photocatalysts themselves. While many approaches for the synthesis of three-dimensional carbon nitride materials are available, only top-down approaches by exfoliation of powders lead to thin-film flakes of this inherently two-dimensional material. Here, we describe an in situ on-surface synthesis of monolayer 2D carbon nitride films as a first step toward precise combination with other 2D materials.

Walter Reppe Revival - Identification and Genesis of Copper Acetylides Cu C as Active Species in Ethynylation Reactions.

More than six decades after proposing copper acetylide, Cu C , as catalytically active species in ethynylation reactions by Walter Reppe, the explosive species have been experimentally identified and investigated during catalysis in detail now. Taking into account specific safety precautions, unequivocal qualitative characterization was achieved by Raman spectroscopy and X-ray powder diffraction of supported copper catalysts Cu/Bi/SiO during and after activation and catalysis in comparison to bulk Cu C materials. Quantification of Cu C succeeded by thermal analysis and Raman spectroscopy.