Three-Dimensional Mesoporous Covalent Organic Frameworks through Steric Hindrance Engineering

Yujie Wang (1) , Yaozu Liu (1) , Hui Li (1) , Xinyu Guan (1) , Ming Xue (1) , Yushan Yan (2) , Valentin Valtchev (3, 1) , Shilun Qiu (1) , Qianrong Fang (1)

1 JLU - Jilin University
2 University of Delaware [Newark]
3 LCS - Laboratoire catalyse et spectrochimie

The development of three-dimensional covalent organic frameworks (COFs) with large pores and high surface areas is of great importance for various applications. However, it remains a major challenge due to the unavoidable structural interpenetration and pore collapse after the removal of guest species sitiated in the pores. Herein, we report for the first time a series of 3D mesoporous COFs through a general strategy of enhanced steric hindrance. By using methoxy-modified monomer and increasing methyl groups of linkers, these 3D COFs can be obtained successfully as exclusively non-interpenetrated diamondoid structures, permanent mesopores (up to 26.5 Å), and high surface areas (> 3000 m 2 g-1), which are far superior to those of reported conventional COFs with the same topology. This work thus opens a way to create 3D large-porous COFs for potential applications in adsorption and separation of large inorganic, organic, and biological species.

Domaines: Matériaux

Yujie Wang, Yaozu Liu, Hui Li, Xinyu Guan, Ming Xue, et al.. Three-Dimensional Mesoporous Covalent Organic Frameworks through Steric Hindrance Engineering. Journal of the American Chemical Society, 2020, 142 (8), pp.3736-3741. ⟨10.1021/jacs.0c00560⟩. ⟨hal-03033995⟩