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NOVIDADES
Coronoids are circular polycyclic aromatic hydrocarbons with a central cavity. Kekulene, a ring formed from benzene rings, is a simple example of this type of compound. Larger coronoids with more than one layer of benzene rings can also be considered to be porous nanographenes. These coronoids can be difficult to characterize due to their low solubility. On-surface synthesis can be used for the preparation of coronoids and, at the same time, allow their characterization using methods such as scanning tunneling microscopy (STM) or atomic force microscopy (AFM). Kekulene. Credit: ACS
Under highly diluted conditions, the team obtained yields of 30 % and 6 % for [5]- and [6]coronoid, respectively. Various chainlike structures and some macrocycles were formed as side products. The structures of [6]coronoid and [5]coronoid were investigated using AFM. The team found that [6]coronoid is planar on the gold surface and the size of its inner cavity is 1.4 nm. [5]Coronoid is nonplanar, with two of its inner edges appearing to be raised in STM and AFM images. The size of its pore is 1.1 nm. According to the researchers, the coronoids might be useful building blocks for larger nanoporous graphenes. ChemistryView. Accessed: July 20, 2020.
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