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Title: Enhancing Van der Waals Interactions of Functionalized UiO‐66 with Non‐polar Adsorbates: The Unique Effect of para Hydroxyl Groups

Abstract

Abstract UiO‐66 is a highly stable metal‐organic framework (MOF) that has garnered interest for many adsorption applications. For small, nonpolar adsorbates, physisorption is dominated by weak Van der Waals interactions limiting the adsorption capacity. A common strategy to enhance the adsorption properties of isoreticular MOFs, such as UiO‐66, is to add functional groups to the organic linker. Low and high pressure O 2 isotherms were measured on UiO‐66 MOFs functionalized with electron donating and withdrawing groups. It was found that the electron donating effects of ‐NH 2 , ‐OH, and ‐OCF 3 groups enhance the uptake of O 2 . Interestingly, a significant enhancement in both the binding energy and adsorption capacity of O 2 was observed for UiO‐66‐(OH) 2 ‐p, which has two ‐OH groups para from one another. Density functional theory (DFT) simulations were used to calculate the binding energy of oxygen to each MOF, which trended with the adsorption capacity and agreed well with the heats of adsorption calculated from the Toth model fit to multi‐temperature isotherms. DFT simulations also determined the highest energy binding site to be on top of the electron π‐cloud of the aromatic ring of the ligand, with a direct trend of themore » binding energy with low pressure adsorption capacity. Uniquely, DFT found that oxygen molecules adsorbed to UiO‐66‐(OH) 2 ‐p prefer to align parallel to the ‐OH groups on the aromatic ring. Similar effects for the electron donation of the functional groups were observed for the low pressure adsorption of N 2 , CH 4 , and CO 2 .« less

Authors:
 [1];  [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Edgewood Chemical Biological Center U.S. Army Research, Development and Engineering Command 5183 Blackhawk Road Aberdeen Proving Ground MD 21020 USA
  2. Nanoscale Sciences Department Sandia National Laboratories Albuquerque New Mexico 87185 USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1415668
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Chemistry - A European Journal
Additional Journal Information:
Journal Name: Chemistry - A European Journal Journal Volume: 24 Journal Issue: 8; Journal ID: ISSN 0947-6539
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Tovar, Trenton M., Iordanov, Ivan, Sava Gallis, Dorina F., and DeCoste, Jared B. Enhancing Van der Waals Interactions of Functionalized UiO‐66 with Non‐polar Adsorbates: The Unique Effect of para Hydroxyl Groups. Germany: N. p., 2018. Web. doi:10.1002/chem.201704779.
Tovar, Trenton M., Iordanov, Ivan, Sava Gallis, Dorina F., & DeCoste, Jared B. Enhancing Van der Waals Interactions of Functionalized UiO‐66 with Non‐polar Adsorbates: The Unique Effect of para Hydroxyl Groups. Germany. https://doi.org/10.1002/chem.201704779
Tovar, Trenton M., Iordanov, Ivan, Sava Gallis, Dorina F., and DeCoste, Jared B. Thu . "Enhancing Van der Waals Interactions of Functionalized UiO‐66 with Non‐polar Adsorbates: The Unique Effect of para Hydroxyl Groups". Germany. https://doi.org/10.1002/chem.201704779.
@article{osti_1415668,
title = {Enhancing Van der Waals Interactions of Functionalized UiO‐66 with Non‐polar Adsorbates: The Unique Effect of para Hydroxyl Groups},
author = {Tovar, Trenton M. and Iordanov, Ivan and Sava Gallis, Dorina F. and DeCoste, Jared B.},
abstractNote = {Abstract UiO‐66 is a highly stable metal‐organic framework (MOF) that has garnered interest for many adsorption applications. For small, nonpolar adsorbates, physisorption is dominated by weak Van der Waals interactions limiting the adsorption capacity. A common strategy to enhance the adsorption properties of isoreticular MOFs, such as UiO‐66, is to add functional groups to the organic linker. Low and high pressure O 2 isotherms were measured on UiO‐66 MOFs functionalized with electron donating and withdrawing groups. It was found that the electron donating effects of ‐NH 2 , ‐OH, and ‐OCF 3 groups enhance the uptake of O 2 . Interestingly, a significant enhancement in both the binding energy and adsorption capacity of O 2 was observed for UiO‐66‐(OH) 2 ‐p, which has two ‐OH groups para from one another. Density functional theory (DFT) simulations were used to calculate the binding energy of oxygen to each MOF, which trended with the adsorption capacity and agreed well with the heats of adsorption calculated from the Toth model fit to multi‐temperature isotherms. DFT simulations also determined the highest energy binding site to be on top of the electron π‐cloud of the aromatic ring of the ligand, with a direct trend of the binding energy with low pressure adsorption capacity. Uniquely, DFT found that oxygen molecules adsorbed to UiO‐66‐(OH) 2 ‐p prefer to align parallel to the ‐OH groups on the aromatic ring. Similar effects for the electron donation of the functional groups were observed for the low pressure adsorption of N 2 , CH 4 , and CO 2 .},
doi = {10.1002/chem.201704779},
journal = {Chemistry - A European Journal},
number = 8,
volume = 24,
place = {Germany},
year = {Thu Jan 04 00:00:00 EST 2018},
month = {Thu Jan 04 00:00:00 EST 2018}
}

Journal Article:
Free Publicly Available Full Text
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https://doi.org/10.1002/chem.201704779

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