Water Promotes Melting of a Metal–Organic Framework

Søren Strandskov Sørensen*, Anders Kurt Rødsgaard Christensen, Elena A. Bouros-Bandrabur, Emil S. Andersen, Heidi F. Christiansen, Sofie Lang, Fengming Cao, Mohamed Faizal Ussama Jalaludeen, Johan Frederik Schou Christensen, Wessel Martinus Wilhelmus Winters, Bettina P. Andersen, Anders B. Nielsen, Niels Christian Nielsen, Dorthe B. Ravnsbæk, Peter Kjær Kristensen, Yuanzheng Yue, Morten Mattrup Smedskjær*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Water is one of the most reactive and abundant molecules on Earth, and it is thus crucial to understand its reactivity with various material families. One of the big unknown questions is how water in liquid and vapor forms impact the fast-emerging class of metal–organic frameworks (MOFs). Here, we discover that high-pressure water vapor drastically modifies the structure and hence the dynamic, thermodynamic, and mechanical properties of MOF glasses. In detail, we find that an archetypical MOF (ZIF-62) is extremely sensitive to heat treatments performed at 460 °C and water vapor pressures up to ∼110 bar. Both the melting and glass transition temperatures decrease remarkably (by >100 °C), and simultaneously, hardness and Young’s modulus increase by up to 100% under very mild treatment conditions (<20 bar of hydrothermal pressure). Structural analyses suggest water to partially coordinate to Zn in the form of a hydroxide ion by replacing a bridging imidazolate-based linker. The work provides insight into the role of hot-compressed water in influencing the structure and properties of MOF glasses and opens a new route for systematically changing the thermodynamics and kinetics of MOF liquids and thus altering the thermal and mechanical properties of the resulting MOF glasses.
Original languageEnglish
JournalChemistry of Materials
Issue number6
Pages (from-to)2756-2766
Publication statusPublished - 6 Mar 2024


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