Journal
CRYSTAL GROWTH & DESIGN
Volume 21, Issue 1, Pages 270-276Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.cgd.0c01080
Keywords
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Funding
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program [742743]
- BMBF [05K19OD2]
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This study monitored the solvent desorption process in the pores of DUT-49(M) frameworks in real-time using PXRD, revealing the continuous and discontinuous phase transitions from the open pore phase to the intermediate pore phase and from the intermediate pore phase to the contracted pore phase for DUT-49(Cu) and DUT-49(Ni).
Removal of the guest molecules from the pores of metal-organic frameworks (MOFs) is one of the critical steps in particular for highly porous frameworks associated with high internal stress. In the case of isostructural mesoporous DUT-49(M) (M = Cu, Ni, Mn, Fe, Co, Zn, Cd) frameworks, only DUT-49(Cu) and DUT-49(Ni) could be successfully desolvated so far and only by using supercritical activation. To get a deeper insight into the processes occurring upon the desorption of the solvent from the pores of DUT-49(M), the desolvation was monitored in situ by synchrotron powder X-ray diffraction (PXRD). Analysis of the time-resolved PXRD data shows the full structural transformation pathway of the solid, which involves continuous and discontinuous phase transitions from the open pore (op) to the intermediate pore (ip) phase and from the ip to the contracted pore (cp) phase for DUT-49(Cu) and DUT-49(Ni). For DUT-49(Zn), the op to ip transition is directly followed by amorphization of the framework. All other frameworks show direct amorphization of the op phase.
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