固体NMR研究MOFs吸附和分离过程中的主客体相互作用

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

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、CO_(2)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.

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.