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Title: Binding of carbon dioxide and acetylene to free carboxylic acid sites in a metal–organic framework

Journal Article · · Chemical Science
DOI: https://doi.org/10.1039/d4sc00101j · OSTI ID:2471492
ORCiD logo [1];  [2];  [1]; ORCiD logo [3];  [4];  [4];  [5];  [5]; ORCiD logo [4]; ORCiD logo [6]; ORCiD logo [1]
  1. University of Manchester (United Kingdom)
  2. University of Manchester (United Kingdom); Beijing Normal University (China)
  3. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Laboratory, ISIS Neutron Source
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  5. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
  6. University of Manchester (United Kingdom); Peking University, Beijing (China)

The functionalisation of organic linkers in metal–organic frameworks (MOFs) to improve gas uptake is well-documented. Although the positive role of free carboxylic acid sites in MOFs for binding gas molecules has been proposed in computational studies, relatively little experimental evidence has been reported in support of this. Primarily this is because of the inherent synthetic difficulty to prepare MOF materials bearing free, accessible –COOH moieties which would normally bind to metal ions within the framework structure. Here, we describe the direct binding of CO2 and C2H2 molecules to the free –COOH sites within the pores of MFM-303(Al). MFM-303(Al) exhibits highly selective adsorption of CO2 and C2H2 with a high selectivity for C2H2 over C2H4. In situ synchrotron X-ray diffraction and inelastic neutron scattering, coupled with modelling, highlight the cooperative interactions of adsorbed CO2 and C2H2 molecules with free –COOH and –OH sites within MFM-303(Al), thus rationalising the observed high selectivity for gas separation.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Compute and Data Environment for Science (CADES)
Sponsoring Organization:
Engineering and Physical Sciences Research Council (ESPRC); European Research Council (ERC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2471492
Journal Information:
Chemical Science, Journal Name: Chemical Science Journal Issue: 21 Vol. 15; ISSN 2041-6520
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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