TY - JOUR
T1 - Norbornane-based covalent organic frameworks for gas separation
AU - Kumar, Sushil
AU - Abdulhamid, Mahmoud A.
AU - Dinga Wonanke, A. D.
AU - Addicoat, Matthew A.
AU - Szekely, Gyorgy
N1 - Funding Information:
SK and MAH thank King Abdullah University of Science and Technology (KAUST) for the postdoctoral fellowship. The research reported in this publication was supported by funding from KAUST. We acknowledge Rifan Hardian for the IAST calculations, Abdul Hamid Emwas for the solid-state 13C CP–MAS NMR analysis, and Mohamed Nejib Hedhili for the XPS measurements. MAA thanks the Materials Chemistry Consortium for HPC access (EP/T022213).
Publisher Copyright:
© 2022 The Royal Society of Chemistry.
PY - 2022/2/14
Y1 - 2022/2/14
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85124497963&partnerID=8YFLogxK
U2 - 10.1039/d1nr07593d
DO - 10.1039/d1nr07593d
M3 - Article
C2 - 35103279
AN - SCOPUS:85124497963
SN - 2040-3364
VL - 14
SP - 2475
EP - 2481
JO - Nanoscale
JF - Nanoscale
IS - 6
ER -