Optimizing Acetylene Sorption through Induced‐fit Transformations in a Chemically Stable Microporous Framework

Abstract Developing practical storage technologies for acetylene (C 2 H 2 ) is important but challenging because C 2 H 2 is useful but explosive. Here, a novel metal–organic framework (MOF) ( FJI‐H36 ) with adaptive channels was prepared. It can effectively capture C 2 H 2 (159.9 cm 3 cm −3 ) at 1 atm and 298 K, possessing a record‐high storage density (561 g L −1 ) but a very low adsorption enthalpy (28 kJ mol −1 ) among all the reported MOFs. Structural analyses show that such excellent adsorption performance comes from the synergism of active sites, flexible framework, and matched pores; where the adsorbed‐C 2 H 2 can drive FJI‐H36 to undergo induced‐fit transformations step by step, including deformation/reconstruction of channels, contraction of pores, and transformation of active sites, finally leading to dense packing of C 2 H 2 . Moreover, FJI‐H36 has excellent chemical stability and recyclability, and can be prepared on a large scale, enabling it as a practical adsorbent for C 2 H 2 . This will provide a useful strategy for developing practical and efficient adsorbents for C 2 H 2 storage.