An Expanded 2D Fused Aromatic Network with 90-Ring Hexagons.

Two-dimensional fused aromatic networks (2D FANs) have emerged as a highly versatile alternative to holey graphene. The synthesis of 2D FANs with increasingly larger lattice dimensions will enable new application perspectives. However, the synthesis of larger analogues is mostly limited by lack of appropriate monomers and methods.

Mechanically Interlocked Nitrogenated Nanographenes.

Herein, we report the synthesis of mechanically interlocked nitrogenated nanographenes. These systems have been obtained by clipping different tetralactam macrocycles around a 1.9 nm dumbbell-shaped nitrogenated nanographene.

Giant Star-Shaped Nitrogen-Doped Nanographenes.

Star-shaped nanographenes (SNGs) are large monodisperse polycyclic aromatic hydrocarbons that are larger than a nanometer and have shown a lot of promise in a wide range of applications including electronics, energy conversion, and sensing. Herein, we report a new family of giant star-shaped N-doped nanographenes with diameters up to 6.5 nm.

Benzotrithiophene versus Benzo/Naphthodithiophene Building Blocks: The Effect of Star-Shaped versus Linear Conjugation on Their Electronic Structures.

The synthesis, characterization, and optical properties of a novel star-shaped oligothiophene with a central rigid trithienobenzene (BTT) core and diketopyrrolopyrrole (DPP) units are reported and compared with homologous linear systems based on the benzodithiophene (BDT) and the naphthodithiophene (NDT) units end capped with DPPs. This comparison is aimed at elucidating the effect of the star-shaped configuration versus linear conformation on the optical and electrical properties. Electronic and vibrational spectroscopies, together with transient absorption spectroscopy, scanning electronic microscopy, and DFT calculations are used to understand not only the molecular properties of these semiconductors, but also to analyze the supramolecular aggregation in these derivatives.

One-pot synthesis of 1,3,5-triazine derivatives via controlled cross-cyclotrimerization of nitriles: a mechanism approach.

The reaction of equimolecular amounts of a nitrile and triflic anhydride or triflic acid at low temperature produces an intermediate nitrilium salt that subsequently reacts with 2 equiv of a different nitrile at higher temperature to form 2,4-disusbstituted-6-substituted 1,3,5-triazines in moderate to good yields. This synthetic procedure has also been applied to the preparation of a 1,3,5-triazine having three different substituents. The results are explained in terms of a mechanism based on the relative stability of the intermediate nitrilium salts that are formed through a reversible pathway.