期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 138, 期 36, 页码 11477-11480出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b07374
关键词
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资金
- Global Research Laboratory of the Korean Ministry of Science, ICT and Planning (MSIP) [NRF-2009-00408]
- National Research Laboratory of the Korean Ministry of Science, ICT and Planning (MSIP) [NRF-2015R1A2A1A01007227]
- PAL
- Collaborative Access Program of SSRL
- [NRF-2016K1A4A3914691]
- [NRF-2016K1A3A7A09005244]
Pressure-dependent structural and chemical changes of the zeolitic imidazolate framework compound ZIF-8 have been investigated using different pressure transmitting media (PTM) up to 4 GPa. The unit cell of ZIF-8 expands and contracts under hydrostatic pressure depending on the solvent molecules used as PTM. When pressurized in water up to 2.2(1) GPa, the unit cell of ZIF-8 reveals a gradual contraction. In contrast, when alcohols are used as PTM, the ZIF-8 unit cell volume initially expands by 1.2% up to 0.3(1) GPa in methanol, and by 1.7% up to 0.6(1) GPa in ethanol. Further pressure increase then leads to a discontinuous second volume expansion by 1.9% at 1.4(1) GPa in methanol and by 0.3% at 2.3(1) GPa in ethanol. The continuous uptake of molecules under pressure, modeled by the residual electron density derived from Rietveld refinements of Xray powder diffraction, reveals a saturation pressure near 2 GPa. In non-penetrating PTM (silicone oil), ZIF-8 becomes amorphous at 0.9(1) GPa. The structural changes observed in the ZIF-8-PTM system under pressure point to distinct molecular interactions within the pores.
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