CC BY-NC-ND 4.0 · Organic Materials 2021; 03(02): 277-282
DOI: 10.1055/a-1477-5123
Energy Materials in the Age of Globalization
Original Article

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

a   The Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
Gregory T. McCandless
a   The Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
b   Institute for Combinatorial Advanced Research & Education (KDU-CARE), General Sir John Kotelawala Defence University Kandawala Rd, Ratmalana, 10390, Sri Lanka
a   The Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, Texas 75080, United States
› Author Affiliations
Funding Information This research was supported a grant from the Army Research Laboratory (W911NF-18-2-0035).


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.

Supporting Information

Supporting Information for this article is available online at

Supporting Information

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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