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Issue 31, 2018
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Selective CO2 adsorption by a new metal–organic framework: synergy between open metal sites and a charged imidazolinium backbone

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Abstract

Metal–organic frameworks (MOFs) are porous, tunable crystalline materials that are attracting widespread scientific attention for their potential use in post-combustion CO2 capture. In this work, we report the synthesis of a new ligand, 1,3-bis(4-carboxyphenyl)-4,5-dihydro-1H-imidazol-3-ium tetrafluoroborate, H2Sp5-BF4, that is subsequently used for the construction of a novel MOF, Cu-Sp5-EtOH. This highly crystalline material has a charged framework that is expected to give rise to high CO2/N2 selectivity. However, the pores of the parent structure could not be accessed due to the presence of strongly coordinated ethanol molecules. After solvent exchange with methanol and subsequently heating Cu-Sp5-MeOH under vacuum, we are able to liberate the solvent providing other small molecules like CO2 access to the inside of the now porous structure, Cu-Sp5. The combination of open metal sites and framework charge leads to an exceptionally high CO2/N2 selectivity, as determined by Ideal Adsorbed Solution Theory (IAST) calculations performed on single-component adsorption isotherms. The CO2/N2 selectivity of Cu-Sp5 reaches a value of over 200 at pressures typically found in post-combustion flue gas (0.15 bar CO2/0.85 bar N2), a value that is among the highest reported to date.

Graphical abstract: Selective CO2 adsorption by a new metal–organic framework: synergy between open metal sites and a charged imidazolinium backbone

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Supplementary files

Article information


Submitted
30 Mar 2018
Accepted
18 May 2018
First published
18 May 2018

Dalton Trans., 2018,47, 10527-10535
Article type
Paper

Selective CO2 adsorption by a new metal–organic framework: synergy between open metal sites and a charged imidazolinium backbone

I. Kochetygov, S. Bulut, M. Asgari and W. L. Queen, Dalton Trans., 2018, 47, 10527
DOI: 10.1039/C8DT01247D

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