High-Pressure Chemistry of a Zeolitic Imidazolate Framework Compound in the Presence of Different Fluids
- Authors
- Im, Junhyuck; Yim, Narae; Kim, Jaheon; Vogt, Thomas; Lee, Yongjae
- Issue Date
- 14-Sep-2016
- Publisher
- AMER CHEMICAL SOC
- Citation
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.138, no.36, pp.11477 - 11480
- Journal Title
- JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
- Volume
- 138
- Number
- 36
- Start Page
- 11477
- End Page
- 11480
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/7505
- DOI
- 10.1021/jacs.6b07374
- ISSN
- 0002-7863
- Abstract
- 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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