Abstract
The crystal structure and phase transition of cubic structure II (sII) binary clathrate hydrates of methane (CH4) and propanol are reported from powder X-ray diffraction measurements. The deformation of host water cages at the cubic–tetragonal phase transition of 2-propanol+CH4hydrate, but not 1-propanol+CH4hydrate, was observed below about 110 K. It is shown that the deformation of the host water cages of 2-propanol+CH4hydrate can be explained by the restriction of the motion of 2-propanol within the 51264host water cages. This result provides a low-temperature structure due to a temperature-induced symmetry-lowering transition of clathrate hydrate. This is the first example of a cubic structure of the common clathrate hydrate families at a fixed composition.
Original language | English |
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Pages (from-to) | 9287-9291 |
Number of pages | 5 |
Journal | Angewandte Chemie - International Edition |
Volume | 55 |
Issue number | 32 |
DOIs | |
Publication status | Published - 2016 |
Keywords
- clathrates
- gas hydrates
- inclusion compounds
- phase transitions
- powder X-ray diffraction
ASJC Scopus subject areas
- Catalysis
- Chemistry(all)