Designed synthesis of large-pore crystalline polyimide covalent organic frameworks
Qianrong Fang1, Zhongbin Zhuang1, Shuang Gu1
1Department of Chemical and Biomolecular Engineering, Center for Catalytic Science and Technology, University of Delaware, Newark Delaware 19716, USA.
Abstract:
Covalent organic frameworks (COFs) are an emerging class of porous crystalline polymers with a wide variety of applications. They are currently synthesized through only a few chemical reactions, limiting the access and exploitation of new structures and properties. Here we report that the imidization reaction can be used to prepare a series of polyimide (PI) COFs with pore size as large as 42 × 53 Å(2), which is among the largest reported to date, and surface area as high as 2,346 m(2) g(-1), which exceeds that of all amorphous porous PIs and is among the highest reported for two-dimensional COFs. These PI COFs are thermally stable up to 530 °C. We also assemble a large dye molecule into a COF that shows sensitive temperature-dependent luminescent properties.
