A two-step solvothermal procedure to improve crystallinity of covalent organic frameworks and achieve scale-up preparation

• Published in: Chinese chemical letters Vol. 33; no. 5; pp. 2464 - 2468
• Main Authors: Han, Xiang-Hao, Chu, Jia-Qi, Wang, Wen-Zhuang, Qi, Qiao-Yan, Zhao, Xin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2022; Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules,Center for Excellence in Molecular Synthesis,Shanghai Institute of Organic Chemistry,University of Chinese Academy of Sciences,Chinese Academy of Sciences,Shanghai 200032,China%Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules,Center for Excellence in Molecular Synthesis,Shanghai Institute of Organic Chemistry,University of Chinese Academy of Sciences,Chinese Academy of Sciences,Shanghai 200032,China; Shanghai Normal University,Shanghai 200234,China
• Subjects: Covalent organic frameworks; High crystallinity; Scale-up preparation; Solvothermal condensation; Synthesis; Covalent organic frameworks; Solvothermal condensation; Scale-up preparation; Synthesis; High crystallinity
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2021.11.066

Covalent organic frameworks (COFs), as a novel class of functional polymers, exhibit versatile applications due to their crystalline porous structures and conjugated skeletons. However, synthesis of COFs with high crystallinity still faces great challenges, especially for scale-up preparation. Herein we report a two-step solvothermal process to improve crystallinity of COFs. The first step focuses on polycondensation of monomers with no need for optimizing crystallization conditions. In the second step, appropriate solvothermal conditions are used to facilitate crystallization of the COFs through defects correction and structural repairing. Furthermore, this strategy could also be applicable to scale-up synthesis of high quality COFs, which lays a foundation for their practical applications. A two-step solvothermal procedure is developed to synthesize covalent organic frameworks (COFs). This method not only affords COFs with high crystallinity, but also achieves scale-up synthesis. [Display omitted]