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Selective Gas Uptake and Rotational Dynamics in a (3,24)-Connected Metal-Organic Framework Material.

William J F Trenholme1,2, Daniil I Kolokolov3,4, Michelle Bound2

  • 1School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.

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This study introduces MFM-160a, a metal-organic framework (MOF) material with exceptional carbon dioxide (CO2) uptake and selective separation of hydrocarbons. Its unique properties are linked to dynamic linker rotations influenced by gas binding.

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Area of Science:

  • Materials Science
  • Chemistry
  • Chemical Engineering

Background:

  • Metal-organic frameworks (MOFs) are porous materials with tunable properties for gas storage and separation.
  • Developing MOFs with high selectivity and capacity for industrially relevant gases remains a key challenge.
  • Understanding the dynamic behavior of MOF linkers is crucial for optimizing their performance.

Purpose of the Study:

  • To synthesize and characterize a novel (3,24)-connected MOF, MFM-160a.
  • To evaluate the CO2 uptake and selective separation capabilities of MFM-160a for hydrocarbons.
  • To investigate the dynamic behavior of the MOF linker and its relationship with gas adsorption.

Main Methods:

  • Synthesis and desolvation of the MOF material MFM-160a.
  • High-pressure gas sorption measurements for CO2, C2H2, C2H4, and CH4.
  • Solid-state 2H NMR spectroscopy to study linker dynamics.
  • Density Functional Theory (DFT) calculations to model gas-linker interactions.

Main Results:

  • MFM-160a exhibits high CO2 uptake (110 wt% at 20 bar) and selective separation of C2 hydrocarbons from CH4 (e.g., C2H2:CH4 selectivity of 79:1).
  • Ultra-low barrier rotation of phenyl groups in the MOF linker was observed, with rotation rates significantly slower than typical solid-state materials.
  • Gas adsorption (CO2, C2H2) was found to increase linker rotation rates, attributed to weakened intramolecular hydrogen bonds.

Conclusions:

  • MFM-160a demonstrates promising performance for CO2 capture and hydrocarbon separations.
  • The dynamic linker rotation in MFM-160a is a key factor influencing its gas adsorption properties.
  • The observed gas-induced changes in linker dynamics provide insights into MOF-gas interactions and design principles.