Chinese Journal of Magnetic Resonance ›› 2023, Vol. 40 ›› Issue (2): 192-206.doi: 10.11938/cjmr20223027

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Solid-state NMR Investigation of the Host-guest Interactions in Gas Adsorption and Chemical Separation Using MOFs as Adsorbents

HE Caiyan1,2,XIAO Yuqing1,2,LI Shenhui1,*(),XU Jun1,DENG Feng1,#()   

  1. 1. Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan 430071, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2022-10-10 Published:2023-06-05 Online:2022-11-03
  • Contact: LI Shenhui,DENG Feng E-mail:lishenhui@wipm.ac.cn;dengf@wipm.ac.cn

Abstract:

Due to its sensitivity to the local geometries and chemical environments, solid-state nuclear magnetic resonance (NMR) is widely applied to investigate the host-guest interactions between metal-organic frameworks (MOFs) and guest molecules in the studies of gas adsorption and chemical separation. Multi-nuclear, multi-dimensional and variable temperature solid-state NMR is employed to investigate the adsorption behavior, primary adsorption sites, dynamic property, and self-diffusion coefficients of light hydrocarbons and carbon dioxide inside the MOFs channels. Moreover, solid-state NMR spectroscopy is utilized to determine the adsorption selectivity, visualize the preferential adsorption and uncover the separation mechanism of light alkane/alkene mixtures inside MOFs. Furthermore, solid-state NMR is used to explore the detailed host-guest interaction mechanism between common chemicals and MOFs adsorbents. All these findings provide insights into deep understanding of the structure-property relationship for the application of functional MOFs in gas adsorption and chemical separation.

Key words: solid-state NMR, metal-organic frameworks (MOFs), host-guest interaction, adsorption and separation

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