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<p>Understanding the pore structure of covalent organic frameworks (COFs) is critical for evaluating synthetic precision and enabling their unique functionalities. While conventional techniques, such as powder X-ray diffraction, gas adsorption isotherms, and transmission electron microscopy, provide geometric information on pore size and shape, the connectivity of pore structure of COFs remains poorly understood. Herein, we report the first application of two-dimensional exchange spectroscopy (2D EXSY) <sup>129</sup>Xe nuclear magnetic resonance (NMR) for revealing pore interconnectivity between two distinct pores within Kagome COFs. Multinuclear and multidimensional solid-state NMR techniques quantitively identify that as little as 5.2%±0.4% of defects on chemical connectivity can lead to detectable spatial correlations between pores, highlighting the exceptional sensitivity of 2D EXSY <sup>129</sup>Xe NMR. This study establishes a characterization paradigm for probing spatial correlations among isolated pores, offering critical insights into complex host-guest chemistry and the assembly mechanism in porous materials.</p>

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Probing the pore structure in Kagome covalent organic frameworks via 2D EXSY 129Xe NMR

  • 期刊论文

  • 发表日期：

    2026年1月4日

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  • Ming-Zhu Qi,
  • Zhi-Peng Wang,
  • Sheng-Hua Ma,
  • Jun-Chen Zhu,
  • Ya-Jie Zhang,
  • Muzaffar Ali Khan,
  • Jie Feng,
  • Yun-Xiang Ma,
  • Wei Wang

摘要

Understanding the pore structure of covalent organic frameworks (COFs) is critical for evaluating synthetic precision and enabling their unique functionalities. While conventional techniques, such as powder X-ray diffraction, gas adsorption isotherms, and transmission electron microscopy, provide geometric information on pore size and shape, the connectivity of pore structure of COFs remains poorly understood. Herein, we report the first application of two-dimensional exchange spectroscopy (2D EXSY) 129Xe nuclear magnetic resonance (NMR) for revealing pore interconnectivity between two distinct pores within Kagome COFs. Multinuclear and multidimensional solid-state NMR techniques quantitively identify that as little as 5.2%±0.4% of defects on chemical connectivity can lead to detectable spatial correlations between pores, highlighting the exceptional sensitivity of 2D EXSY 129Xe NMR. This study establishes a characterization paradigm for probing spatial correlations among isolated pores, offering critical insights into complex host-guest chemistry and the assembly mechanism in porous materials.