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Title: Sub‐5 Ångstrom Porosity Tuning in Calixarene‐Derived Porous Liquids via Supramolecular Complexation Construction

Journal Article · · Angewandte Chemie
 [1];  [2];  [3];  [2];  [4];  [1];  [1];  [1];  [1];  [5];  [3];  [3];  [2]; ORCiD logo [2];  [6]
  1. Department of Chemistry University of Tennessee Knoxville Knoxville TN 37996 USA
  2. Chemical Sciences Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
  3. Department of Chemical and Biomolecular Engineering Vanderbilt University Nashville TN 37235 USA
  4. Neutron Scattering Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA
  5. Pacific Northwest National Laboratory Richland WA 99352 USA, The Gene &, Linda Voiland School of Chemical Engineering and Bioengineering Washington State University Pullman WA 99164 USA
  6. Department of Chemistry University of Tennessee Knoxville Knoxville TN 37996 USA, Chemical Sciences Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA

Abstract Sub‐Ångstrom‐level porosity engineering, which is appealing in gas separations, has been demonstrated in solid carbon, polymer, and framework materials but rarely achieved in the liquid phase. In this work, a gas molecular sieving effect in the liquid phase at sub‐5 Ångstrom scale is created via sophisticated porosity tuning in calixarene‐derived porous liquids (PLs). Type II PLs are constructed via supramolecular complexation between the sodium salts of calixarene derivatives and crown ether solvents. The chemical structure variation and assembly behavior of the porous host upon PL construction are monitored by spectroscopy‐, X‐ray‐, and neutron‐scattering techniques. The presence of permanent porosity in calixarene‐derived PLs is verified by pressure swing gas uptake, altered CO 2 physisorption behavior, and molecular simulations. Sub‐5 Ångstrom porosity tuning within the PL phase is achieved by introducing bulky substituted groups on the benzene ring of the calixarene host, which then greatly affects the dynamic motion and transport behavior of CO 2 molecules and the Xe uptake performance. The approach being demonstrated in this work represents a promising pathway to tune and leverage the porosity effect for enhanced gas uptake capacity and selectivity in liquid sorbents.

Sponsoring Organization:
USDOE
OSTI ID:
2530692
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 11 Vol. 137; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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