One-pot cascade syntheses of microporous and mesoporous pyrazine-linked covalent organic frameworks as Lewis-acid catalysts

Yunchao Ma (1) , Xiaozhou Liu (1) , Xinyu Guan (1) , Hui Li (1) , Yusran Yusran (1) , Ming Xue (1) , Qianrong Fang (1) , Yushan Yan (2) , Shilun Qiu (1) , Valentin Valtchev (3, 1)

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

One-Pot Cascade Syntheses of Microporous and Mesoporous Pyrazine-Linked Covalent Organic Frameworks as Lewis-Acid Catalysts * Covalent organic frameworks (COFs) are crystalline porous solids with broad potential applications. So far, the successful construction of COFs was limited to a few condensation reactions, and nearly all COFs were obtained by single-step synthesis based on predesigned linkers. Here, we report a general strategy in view of a one-pot cascade reaction to prepare both microporous and mesoporous fully π-conjugated pyrazine-linked COF materials (PZ-COFs). The obtained PZ-COFs show high chemical stability, large specific surface areas as well as H2, CH4 and CO2 uptake capacities. Furthermore, we demonstrate that manganese(II)-incorporated PZ-COFs can act as excellent Lewis-acid catalysts for the cyanosilylation of aromatic aldehydes. This study not only provides a facile method to synthesize COFs required for multistep reactions but also expands the applications of COFs as promising catalysts.

Mots clés: TEM images; IR spectra; solid-state 13 C NMR; TGA traces; PXRD patterns and simulations; BET plots; H2; CO2 and CH4 adsorption-desorption isotherms

Domaines: Chimie

Yunchao Ma, Xiaozhou Liu, Xinyu Guan, Hui Li, Yusran Yusran, et al.. One-pot cascade syntheses of microporous and mesoporous pyrazine-linked covalent organic frameworks as Lewis-acid catalysts. Dalton Transactions, 2019, 48 (21), pp.7352-7357. ⟨10.1039/C8DT05056B⟩. ⟨hal-03039940⟩