固体NMR研究MOFs吸附和分离过程中的主客体相互作用

doi:10.11938/cjmr20223027

摘要/Abstract

摘要：

固体核磁共振（NMR）因对结构和化学环境敏感，已广泛应用于研究金属有机框架材料（MOFs）在吸附分离应用上的主客体相互作用机制．多核、多维、变温固体NMR实验可以用来研究低碳碳氢化合物、CO₂在MOFs孔道内的吸附行为（包括优先吸附位点、动力学性质、扩散快慢等）．固体NMR也可用来直接测定低碳烷烃/烯烃在MOFs中的分离选择性，并观测低碳烷烃/烯烃在MOFs孔道内的竞争优先吸附．此外，固体NMR还可用来揭示常见化学品与MOFs的主客体相互作用模式．这些研究的开展将有助于人们理解MOFs在吸附和分离过程中存在的内在构效关系．

关键词: 固体核磁共振, 金属有机框架材料, 主客体相互作用, 吸附和分离

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

中图分类号:

O482.53

贺彩艳,肖宇情,李申慧,徐君,邓风. 固体NMR研究MOFs吸附和分离过程中的主客体相互作用[J]. 波谱学杂志, 2023, 40(2): 192-206.

HE Caiyan,XIAO Yuqing,LI Shenhui,XU Jun,DENG Feng. Solid-state NMR Investigation of the Host-guest Interactions in Gas Adsorption and Chemical Separation Using MOFs as Adsorbents[J]. Chinese Journal of Magnetic Resonance, 2023, 40(2): 192-206.

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