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

• Published in: Dalton transactions : an international journal of inorganic chemistry Vol. 48; no. 21; pp. 7352 - 7357
• Main Authors: Ma, Yunchao, Liu, Xiaozhou, Guan, Xinyu, Li, Hui, Yusran, Yusran, Xue, Ming, Fang, Qianrong, Yan, Yushan, Qiu, Shilun, Valtchev, Valentin
• Format: Journal Article
• Language: English
• Published: Royal Society of Chemistry 28.05.2019
• Subjects: Chemical Sciences; CO2 and CH4 adsorption-desorption isotherms; IR spectra; BET plots; H2; TEM images; solid-state 13 C NMR; PXRD patterns and simulations; TGA traces
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/C8DT05056B

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.