Issue 6, 2022

Norbornane-based covalent organic frameworks for gas separation


Covalent organic frameworks (COFs) have emerged as a new class of crystalline porous materials with distinct structural features, such as uniform pore distribution, tunable architecture, and modifiable skeletons. COFs hold significant promise for application in gas separation because of their high Brunauer–Emmett–Teller surface area and narrow pore-size distribution, which enable selective separation. The porosity and separation performance of COFs have been finely tuned by structurally modifying the starting materials. Along this direction, for the first time, we prepared W-shaped diamines by catalytic arene–norbornene annulation (CANAL) and then treated them with trialdehyde (Tp) to synthesize novel β-ketoenamine-linked norbornane-based COFs, i.e., ND-COF-1 and ND-COF-2, via a solvothermal Schiff-base condensation approach. The pore interior was decorated with methyl groups attached to the norbornane unit of the COF skeleton. Both COFs exhibited high chemical stability in different organic solvents and acidic media. Additionally, they showed high CO2/N2 selectivity compared with those of previously reported COFs. Moreover, their CH4/N2 separation efficiency was investigated, and the results revealed that ND-COF-1 is more selective than ND-COF-2, which could be attributed to the less hindered pathway offered to methane gas molecules by the framework pore.

Graphical abstract: Norbornane-based covalent organic frameworks for gas separation

Supplementary files

Article information

Article type
17 Nov 2021
19 Jan 2022
First published
19 Jan 2022
This article is Open Access
Creative Commons BY license

Nanoscale, 2022,14, 2475-2481

Norbornane-based covalent organic frameworks for gas separation

S. Kumar, M. A. Abdulhamid, A. D. Dinga Wonanke, M. A. Addicoat and G. Szekely, Nanoscale, 2022, 14, 2475 DOI: 10.1039/D1NR07593D

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

Read more about how to correctly acknowledge RSC content.

Social activity