Semiconducting 2D Triazine-Cored Covalent Organic Frameworks with Unsubstituted Olefin Linkages

Establishing an sp2-carbon-bonding pattern is one of the efficient accesses to various organic semiconducting materials. However, the less-reversible carbon–carbon bond formation makes it still challenging to spatially construct a well-defined organic framework with π-extended two-dimensional (2D) structure through solution process. Here, a Knoevenagel condensation approach to synthesize two new 2D covalent organic frameworks (COFs) connected by unsubstituted carbon–carbon double bond linkages through activating the methyl carbons of a 2,4,6-trimethyl-1,3,5-triazine monomer is presented. The resulting sp2-carbon-linked triazine-cored 2D sheets are vertically stacked into high-crystalline honeycomb-like…

• NN
  National Natural Science Foundation of China

  Awards: 21574080, 21774072, 21720102002
• SA
  Science and Technology Commission of Shanghai Municipality

  Award: 16JC1400703
• SJ
  Shanghai Jiao Tong University
• SK
  State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University

  Award: 2019-01
• CO
  Coordination of European Transnational Research in Organic Food and Farming Systems