Phase Transition of a Structure II Cubic Clathrate Hydrate to a Tetragonal Form

Satoshi Takeya, Hiroshi Fujihisa, Hiroshi Yamawaki, Yoshito Gotoh, Ryo Ohmura, Saman Alavi, John A. Ripmeester

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


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 languageEnglish
Pages (from-to)9287-9291
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number32
Publication statusPublished - 2016 Aug


  • clathrates
  • gas hydrates
  • inclusion compounds
  • phase transitions
  • powder X-ray diffraction

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry


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