Synthesis of Side-Chain-Free Hydrazone-Linked Covalent Organic Frameworks through Supercritical Carbon Dioxide Activation

Abstract

Supercritical carbon dioxide (scCO₂) activation provides milder conditions to process covalent organic frameworks (COFs) without compromising their crystallinity and porosity. To this end, three hydrazone COFs (TFPB-DHz COF, TFPT-DHz COF, Py-DHz COF) were synthesized with a terephthaloyl dihydrazide linker (DHz) which has no substituents. To date, the synthesis of hydrazone COFs without a narrow range of alkoxy linkers has not been possible. The scCO₂-activated hydrazone-linked COFs in this study were crystalline and had high surface areas (surface areas of TFPB-DHz COF, TFPT-DHz COF, and Py-DHz COF were 790, 1199, and 932 m²/g, respectively). This study shows the significance of using milder activation methods for making hydrazone-linked COF structures that were previously inaccessible.

Key words

covalent organic frameworks - hydrazones - supercritical carbon dioxide

Supporting Information

Supporting Information for this article is available online at https://doi.org/10.1055/a-1477-5123.

Publication History

Received: 16 February 2021

Accepted: 15 March 2021

Accepted Manuscript online:
08 April 2021

Article published online:
11 May 2021

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