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Enhancement of CO2 uptake and selectivity in a metal-organic framework by incorporation of thiophene functionality

Bolotov, Vsevolod A.; Kovalenko, Konstantin A.; Samsonenko, Denis G.; Han, Xue; Zhang, Xinran; Smith, Gemma L.; McCormick, Laura; Teat, Simon J.; Yang, Sihai; Lennox, Matthew J.; Henley, Alice; Besley, Elena; Fedin, Vladimir P.; Dybtsev, Danil N.; Schröder, Martin

Authors

Vsevolod A. Bolotov

Konstantin A. Kovalenko

Denis G. Samsonenko

Xue Han

Xinran Zhang

Gemma L. Smith

Laura McCormick

Simon J. Teat

Sihai Yang

Matthew J. Lennox

Alice Henley

ELENA BESLEY Elena.Besley@nottingham.ac.uk
Professor of Theoretical Computational Chemistry

Vladimir P. Fedin

Danil N. Dybtsev

Martin Schröder



Abstract

The complex [Zn2(tdc)2dabco] (H2tdc = thiophene-2,5-dicarboxylic acid; dabco = 1,4-diazabicyclooctane) shows a remarkable increase in CO2 uptake and CO2/N2 selectivity compared to the non-thiophene analogue [Zn2(bdc)2dabco] (H2bdc = benzene-1,4-dicarboxylic acid; terephthalic acid). CO2 adsorption at 1 bar for [Zn2(tdc)2dabco] is 67.4 cm3 x g–1 (13.2 wt.%) at 298 K and 153 cm3 x g–1 (30.0 wt.%) at 273 K. For [Zn2(bdc)2dabco] the equivalent values are 46 cm3 x g–1 (9.0 wt.%) and 122 cm3 x g–1 (23.9 wt.%), respectively. The isosteric heat of adsorption for CO2 in [Zn2(tdc)2dabco] at zero coverage is low (23.65 kJ x mol–1), ensuring facile regeneration of the porous material. The enhancement by the thiophene group on the separation of CO2/N2 gas mixtures has been confirmed by both ideal adsorbate solution theory (IAST) calculations and dynamic breakthrough experiments. The preferred binding sites of adsorbed CO2 in [Zn2(tdc)2dabco] have been unambiguously determined by in situ single crystal diffraction studies on CO2 loaded [Zn2(tdc)2dabco], coupled with quantum chemical calculations. These studies unveil the role of the thiophene moieties in the specific CO2 binding via an induced dipole interaction between the CO2 and the sulfur center, confirming that enhanced CO2 capacity in [Zn2(tdc)2dabco] is achieved without the presence of open metal sites. The experimental data and the theoretical insights suggest a viable strategy for improvement of adsorption properties of already known materials through incorporation of S-based heterocycles within their porous structures.

Citation

Bolotov, V. A., Kovalenko, K. A., Samsonenko, D. G., Han, X., Zhang, X., Smith, G. L., …Schröder, M. (2018). Enhancement of CO2 uptake and selectivity in a metal-organic framework by incorporation of thiophene functionality. Inorganic Chemistry, 57(9), https://doi.org/10.1021/acs.inorgchem.8b00138

Journal Article Type Article
Acceptance Date Apr 23, 2018
Online Publication Date Apr 23, 2018
Publication Date May 7, 2018
Deposit Date Jun 28, 2018
Publicly Available Date Apr 24, 2019
Journal Inorganic Chemisry
Print ISSN 0020-1669
Electronic ISSN 0020-1669
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 57
Issue 9
DOI https://doi.org/10.1021/acs.inorgchem.8b00138
Keywords Carbon dioxide, metal-organic framework, thiophene, carboxylate, zinc, binding site, breakthrough
Public URL http://eprints.nottingham.ac.uk/id/eprint/52663
Publisher URL https://pubs.acs.org/doi/10.1021/acs.inorgchem.8b00138
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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