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Induced Fit of C 2 H 2 in a Flexible MOF Through Cooperative Action of Open Metal Sites
Author(s) -
Zeng Heng,
Xie Mo,
Huang YongLiang,
Zhao Yifang,
Xie XiaoJing,
Bai JianPing,
Wan MengYan,
Krishna Rajamani,
Lu Weigang,
Li Dan
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201904160
Subject(s) - acetylene , microporous material , metal organic framework , enthalpy , adsorption , molecule , metal , materials science , diamond , chemistry , crystallography , chemical engineering , thermodynamics , organic chemistry , physics , engineering
Porous materials that can undergo pore‐structure adjustment to better accommodate specific molecules are ideal for separation and purification. Here, we report a stable microporous metal‐organic framework, JNU‐1, featuring one‐dimensional diamond‐shaped channels with a high density of open metal sites arranged on the surface for the cooperative binding of acetylene. Together with its framework flexibility and appropriate pore geometry, JNU‐1 exhibits an induced‐fit behavior for acetylene. The specific binding sites and continuous framework adaptation upon increased acetylene pressure are validated by molecular modeling and in situ X‐ray diffraction study. This unique induced‐fit behavior endows JNU‐1 with an unprecedented increase in the acetylene binding affinity (adsorption enthalpy: up to 47.6 kJ mol −1 at ca. 2.0 mmol g −1 loading).