Browsing by Author "Li, Qiang Qiang"

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    On-Surface Synthesis of a π-Extended Diaza[8]circulene
    (AMERICAN CHEMICAL SOCIETY, 2020-05-15) Nakamura, Kimihiro; Li, Qiang Qiang; Krejčí, Ondřej; Foster, Adam S.; Sun, Kewei; Kawai, Shigeki; Ito, Shingo; Department of Applied Physics; Surfaces and Interfaces at the Nanoscale; Nanyang Technological University; National Institute for Materials Science
    Heterocyclic [8]circulenes are an important class of polycyclic aromatic hydrocarbon molecules because of their unique structural properties and promising applications. However, the synthesis of heterocyclic [8]circulenes is still limited and thus is an important synthetic challenge. Here we describe the first example of a π-extended diaza[8]circulene surrounded by and fused with six hexagons and two pentagons, which was successfully synthesized only by a combined in-solution and on-surface synthetic strategy. State-of-the-art scanning tunneling microscopy with a CO-functionalized tip and density functional theory calculations revealed its planar conformation and unique electronic structure.