Graphene-Like Covalent Organic Framework with a Wide Band Gap Synthesized On Surface via Stepwise Reactions

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  • Guoqiang Shi, Harbin Institute of Technology
  • ,
  • Junfeng Zhou, CAS - Shanghai Institute of Organic Chemistry
  • ,
  • Zhuo Li, Harbin Institute of Technology
  • ,
  • Ye Sun, Condensed Matter Science and Technology Institute and Department of Physics, Harbin Institute of Technology
  • ,
  • Lev N. Kantorovich, King's College London
  • ,
  • Qiang Fang, CAS - Shanghai Institute of Organic Chemistry
  • ,
  • Flemming Besenbacher
  • Miao Yu, Harbin Institute of Technology

Developing graphene-like two-dimensional materials naturally possessing a band gap has sparked enormous interest. Thanks to the inherent wide band gap and high mobility in the 2D plane, covalent organic frameworks containing triazine rings (t-COFs) hold great promise in this regard, whilst the synthesis of single-layer t-COFs remains highly challenging. Herein, we present the fabrication of a well-defined graphene-like t-COF on Au(111). Instead of single/multiple-step single-type reactions commonly applied for on-surface synthesis, distinct stepwise on-surface reactions, including alkynyl cyclotrimerization, C−O bond cleavage, and C−H bond activation, are triggered on demand, leading to product evolution in a controlled step-by-step manner. Aside from the precise control in sophisticated on-surface synthesis, this work proposes a single-atomic-layer organic semiconductor with a wide band gap of 3.41 eV.

Original languageEnglish
JournalAngewandte Chemie - International Edition
Pages (from-to)15958-15962
Number of pages5
Publication statusPublished - Sep 2020

    Research areas

  • covalent organic frameworks, on-surface synthesis, stepwise reactions, triazine

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