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Title: NMR Spectroscopy Reveals Adsorbate Binding Sites in the Metal–Organic Framework UiO-66(Zr)

Abstract

In this paper, we assign 1H and 13C NMR resonances emanating from acetone, methanol, and cyclohexane adsorbed inside the pores of UiO-66(Zr). These results are informed by density functional theory (DFT) calculations, which probe the role of two competing effects inside of the pore environment: (i) nucleus independent chemical shifts (NICSs) generated by ring currents in conjugated linkers and (ii) small molecule coordination to the metal-oxyhydroxy cluster. These interactions are found to perturb the chemical shift of in-pore adsorbate relative to ex-pore adsorbate (which resides in spaces between the MOF particles). Changes in self-solvation upon adsorption may also perturb the chemical shift. Our results indicate that cyclohexane preferentially adsorbs in the tetrahedral pores of UiO-66(Zr), while acetone and methanol adsorb at the Zr–OH moieties on the metal-oxyhydroxy clusters in a more complex fashion. Finally, this method may be used to probe molecular adsorption sites and material void saturation with selected adsorbates, and with further development may eventually be used to trace in-pore chemistry of MOF materials.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [3]
  1. Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering
  2. Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering. Dept. of Chemistry. Berkeley Energy and Climate Inst.
  3. Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Center for Gas Separations Relevant to Clean Energy Technologies (CGS); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Inst. of Health (NIH) (United States)
OSTI Identifier:
1464165
Grant/Contract Number:  
AC02-05CH11231; SC0001015; DGE # 1106400; S10OD023532
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 122; Journal Issue: 15; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Nandy, Aditya, Forse, Alexander C., Witherspoon, Velencia J., and Reimer, Jeffrey A. NMR Spectroscopy Reveals Adsorbate Binding Sites in the Metal–Organic Framework UiO-66(Zr). United States: N. p., 2018. Web. doi:10.1021/acs.jpcc.7b12628.
Nandy, Aditya, Forse, Alexander C., Witherspoon, Velencia J., & Reimer, Jeffrey A. NMR Spectroscopy Reveals Adsorbate Binding Sites in the Metal–Organic Framework UiO-66(Zr). United States. https://doi.org/10.1021/acs.jpcc.7b12628
Nandy, Aditya, Forse, Alexander C., Witherspoon, Velencia J., and Reimer, Jeffrey A. Fri . "NMR Spectroscopy Reveals Adsorbate Binding Sites in the Metal–Organic Framework UiO-66(Zr)". United States. https://doi.org/10.1021/acs.jpcc.7b12628. https://www.osti.gov/servlets/purl/1464165.
@article{osti_1464165,
title = {NMR Spectroscopy Reveals Adsorbate Binding Sites in the Metal–Organic Framework UiO-66(Zr)},
author = {Nandy, Aditya and Forse, Alexander C. and Witherspoon, Velencia J. and Reimer, Jeffrey A.},
abstractNote = {In this paper, we assign 1H and 13C NMR resonances emanating from acetone, methanol, and cyclohexane adsorbed inside the pores of UiO-66(Zr). These results are informed by density functional theory (DFT) calculations, which probe the role of two competing effects inside of the pore environment: (i) nucleus independent chemical shifts (NICSs) generated by ring currents in conjugated linkers and (ii) small molecule coordination to the metal-oxyhydroxy cluster. These interactions are found to perturb the chemical shift of in-pore adsorbate relative to ex-pore adsorbate (which resides in spaces between the MOF particles). Changes in self-solvation upon adsorption may also perturb the chemical shift. Our results indicate that cyclohexane preferentially adsorbs in the tetrahedral pores of UiO-66(Zr), while acetone and methanol adsorb at the Zr–OH moieties on the metal-oxyhydroxy clusters in a more complex fashion. Finally, this method may be used to probe molecular adsorption sites and material void saturation with selected adsorbates, and with further development may eventually be used to trace in-pore chemistry of MOF materials.},
doi = {10.1021/acs.jpcc.7b12628},
journal = {Journal of Physical Chemistry. C},
number = 15,
volume = 122,
place = {United States},
year = {Fri Mar 23 00:00:00 EDT 2018},
month = {Fri Mar 23 00:00:00 EDT 2018}
}

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Cited by: 28 works
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Figures / Tables:

Figure 1 Figure 1: Unit cell (black outline) of UiO-66(Zr) consisting of the metal-oxyhydroxy cluster and terephthalate linkers.16 Zirconium (blue), oxygen (red), carbon (gray), and hydrogen (white) constitute the full structure. Green and orange spheres represent the tetrahedral and octahedral pores, respectively.

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