Water cluster triggered vitrification in HKUST-1 MOF crystal under pressure
Jianguo Sun , Chin Ho Kirk , Yunchuan Pu , Athulya S. Palakkal , Lewis Kien Juen Ting , Fei Wang , Kok Chan Chong , Tuo Wang , Saad Aldin Mohamed , Bin Liu , Jianwen Jiang , Anthony K. Cheetham , Dan Zhao , John Wang
InfoMat ›› 2026, Vol. 8 ›› Issue (3) : e70100
Metal–organic framework (MOF) glasses feature several unique dynamic and thermodynamic properties that differentiate them from their crystalline counterparts. However, the formation of MOF glasses usually requires the melt-quenching of molten MOFs from relatively high temperatures. In practice, this approach is quite limited because most MOFs decompose below their melting points. Herein, we demonstrate a direct crystal-to-glass transition in HKUST-1 MOF that has been achieved at room temperature and a relatively low pressure of <1.0 GPa. The dramatic fall in the required pressure is shown to arise from the aggregation of coordinated polar water molecules to form water clusters that exhibit a pulling effect on the Cu–O(ligand) bonds. Meanwhile, the departed fragment gets flipped unfavorably to prevent further regeneration of the bond. Accordingly, a grain boundary-free continuous porous framework in the glassy state is successfully formed and can be fabricated into membranes. Given their unique microporosity and grain boundary-free characteristics, such MOF glass membranes present new opportunities for chemical separation (both gases and liquids), electrochemistry, and catalysts, promising a new platform for MOF glasses.
grain-boundary-free membrane / MOF glass / molecular separation / pressure-induced glass transition / water cluster
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2026 The Author(s). InfoMat published by UESTC and John Wiley & Sons Australia, Ltd.
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