One Flexible Metal–Organic Framework with Guest‐Adaptive Rotational Valve for Gas Separation

作者：Pengtao Guo, Jia Fu, Bo Xue, Ting Wang, Lun Yang, Yunpan Ying, Qing‐Yuan Yang, Dahuan Liu · 发表于：Advanced Functional Materials · 年份：2025 · DOI：10.1002/adfm.202500210 · 被引用次数：19 · 研究领域：Metal-Organic Frameworks: Synthesis and Applications、Catalytic Processes in Materials Science、Covalent Organic Framework Applications

Abstract The dynamic structural properties of flexible metal–organic frameworks (MOFs) endow them with a unique ability to recognize guest molecules. However, designing a flexible MOF that is sensitive to guest molecules and can recognize one target molecule from gas mixtures that have weak interactions with the adsorbent remains a challenge. Herein, a “guest‐adaptive rotational valve” strategy is proposed that introduces a guest‐adaptive rotating 3D linker into a 1D confined channel of locally flexible MOF (CoNi‐TED) to address this challenging separation. Under the collaboration of adaptive rotating linkers and dense open metal sites, CoNi‐TED displays record CH 4 /N 2 selectivity (23.5) and CH 4 /N 2 uptake ratio (8.64) at 298 K and 1 bar. Breakthrough experiments and pressure swing adsorption (PSA)simulations show that it can produce CH 4 with a good balance between purity and recovery. Besides, it shows high structural stability and can be scaled up to a kilogram scale under simple and gentle synthesis conditions, rendering it a new benchmark adsorbent for natural gas purification.