Graphene‐Like Covalent Organic Framework with a Wide Band Gap Synthesized On Surface via Stepwise Reactions. Issue 37 (15th July 2020)

• Record Type: Journal Article
• Authors: Shi, Guoqiang; Zhou, Junfeng; Li, Zhuo; Sun, Ye; Kantorovich, Lev N.; Fang, Qiang; Besenbacher, Flemming; Yu, Miao
• Is Part Of: Angewandte Chemie international edition. Volume 59:Issue 37(2020)
• Page Start: 15958
• Page End: 15962
• Publication Date: 2020-07-15
• Subjects: covalent organic frameworks -- on-surface synthesis -- stepwise reactions -- triazine; Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.202006176
• Languages: English
• ISSNs: 1433-7851

Abstract

Abstract: 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. Abstract : Step by step : A well‐defined graphene‐like 2D polymer with a wide band gap has been fabricated on Au(111). Distinct stepwise on‐surface reactions, including alkynyl cyclotrimerization, C−O bond cleavage, and C−H bond activation, were triggered on demand, leading to product evolution in a controlled step‐by‐step manner.