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Title: Biomimetic O 2 adsorption in an iron metal–organic framework for air separation

Abstract

Bio-inspired motifs for gas binding and small molecule activation can be used to design more selective adsorbents for gas separation applications. Here, we report an iron metal–organic framework, Fe-BTTri (Fe3[(Fe4Cl)3(BTTri)8]2·18CH3OH, H3BTTri = 1,3,5-tris(1H-1,2,3-triazol-5-yl)benzene), that binds O2 in a manner similar to hemoglobin and therefore results in highly selective O2 binding. As confirmed by gas adsorption studies and Mössbauer and infrared spectroscopy data, the exposed iron sites in the framework reversibly adsorb substantial amounts of O2 at low temperatures by converting between high-spin, square-pyramidal Fe(II) centers in the activated material to low-spin, octahedral Fe(III)–superoxide sites upon gas binding. This change in both oxidation state and spin state observed in Fe-BTTri leads to selective and readily reversible O2 binding, with the highest reported O2/N2 selectivity for any iron-based framework.

Authors:
ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [2]
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  1. Department of Chemistry, University of California, Berkeley, USA
  2. Department of Chemistry, University of California, Berkeley, USA, Department of Chemical Engineering
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1582680
Alternate Identifier(s):
OSTI ID: 1760220
Grant/Contract Number:  
SC0019992; AC02-06CH11357; AC02-05CH11231
Resource Type:
Published Article
Journal Name:
Chemical Science
Additional Journal Information:
Journal Name: Chemical Science Journal Volume: 11 Journal Issue: 6; Journal ID: ISSN 2041-6520
Publisher:
Royal Society of Chemistry
Country of Publication:
United Kingdom
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Reed, Douglas A., Xiao, Dianne J., Jiang, Henry Z. H., Chakarawet, Khetpakorn, Oktawiec, Julia, and Long, Jeffrey R. Biomimetic O 2 adsorption in an iron metal–organic framework for air separation. United Kingdom: N. p., 2020. Web. doi:10.1039/C9SC06047B.
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Reed, Douglas A., Xiao, Dianne J., Jiang, Henry Z. H., Chakarawet, Khetpakorn, Oktawiec, Julia, & Long, Jeffrey R. Biomimetic O 2 adsorption in an iron metal–organic framework for air separation. United Kingdom. https://doi.org/10.1039/C9SC06047B
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Reed, Douglas A., Xiao, Dianne J., Jiang, Henry Z. H., Chakarawet, Khetpakorn, Oktawiec, Julia, and Long, Jeffrey R. Wed . "Biomimetic O 2 adsorption in an iron metal–organic framework for air separation". United Kingdom. https://doi.org/10.1039/C9SC06047B.
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@article{osti_1582680,
title = {Biomimetic O 2 adsorption in an iron metal–organic framework for air separation},
author = {Reed, Douglas A. and Xiao, Dianne J. and Jiang, Henry Z. H. and Chakarawet, Khetpakorn and Oktawiec, Julia and Long, Jeffrey R.},
abstractNote = {Bio-inspired motifs for gas binding and small molecule activation can be used to design more selective adsorbents for gas separation applications. Here, we report an iron metal–organic framework, Fe-BTTri (Fe3[(Fe4Cl)3(BTTri)8]2·18CH3OH, H3BTTri = 1,3,5-tris(1H-1,2,3-triazol-5-yl)benzene), that binds O2 in a manner similar to hemoglobin and therefore results in highly selective O2 binding. As confirmed by gas adsorption studies and Mössbauer and infrared spectroscopy data, the exposed iron sites in the framework reversibly adsorb substantial amounts of O2 at low temperatures by converting between high-spin, square-pyramidal Fe(II) centers in the activated material to low-spin, octahedral Fe(III)–superoxide sites upon gas binding. This change in both oxidation state and spin state observed in Fe-BTTri leads to selective and readily reversible O2 binding, with the highest reported O2/N2 selectivity for any iron-based framework.},
doi = {10.1039/C9SC06047B},
journal = {Chemical Science},
number = 6,
volume = 11,
place = {United Kingdom},
year = {2020},
month = {2}
}
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https://doi.org/10.1039/C9SC06047B
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