Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 142, Issue 10, Pages 4609-4615Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.0c00542
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Funding
- National Science Foundation's MRSEC program [NSF DMR-1720139]
- Northwestern University Institute for Catalysis in Energy Processes (ICEP) - DOE, Office of Basic Energy Sciences [DE-FG02-03ER15457]
- Northwestern University
- Army Research Office [W911NF1810359]
- NSF Graduate Research Fellowship [DGE-1842165]
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF ECCS-1542205]
- MRSEC program at the Materials Research Center [NSF DMR-1720139]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through the IIN
- U.S. Department of Defense (DOD) [W911NF1810359] Funding Source: U.S. Department of Defense (DOD)
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Zr-6-based metal-organic frameworks (MOFs) with tetratopic organic linkers have been extensively investigated owing to their versatile structural tunability. While diverse topologies and polymorphism in the resulting MOFs are often encountered with tetratopic linkers and Zr-6 nodes, reports on phase transitions within these systems are rare. Thus, we have a limited understanding of polymorph transformations, hindering the rational development of pure phase materials. In this study, a phase transition from a microporous MOF, scu-NU-906, to a mesoporous MOF, csq-NU-1008, was discovered and monitored through in situ variable temperature liquid-cell transmission electron microscopy (VT-LCTEM), high-resolution transmission electron microscopy (HRTEM), and in situ variable temperature powder X-ray diffraction (VT-PXRD). It was found that the microporousto-mesoporous transformation in the presence of formic acid occurs via a concomitant dissolution-reprecipitation process.
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