Abstract
Structural phase transitions of N2-loaded and guest-free hydroquinone (HQ) clathrates have been investigated as a function of pressure using synchrotron X-ray diffraction and Raman spectroscopy. The N 2-loaded β-form HQ clathrate reveals a structural transition to a new high pressure phase near 4 GPa and exhibits gradual N2 release from the hydrogen-bonded organic framework (HOF) cage with a further increase in pressure. Upon reducing the pressure to ambient conditions, the crystal structure reverts to the original β-form HQ clathrate, indicating that the pressure-induced structural transition is fully reversible. In contrast, around 0.4 GPa, the guest-free β-form HQ clathrate undergoes an irreversible phase transition to the nonporous α-form HQ, which is retained at ambient conditions. These results suggest that HOF encaged guest molecules play an important role in the structural transitions under high pressure.
Original language | English |
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Pages (from-to) | 7621-7625 |
Number of pages | 5 |
Journal | Journal of Physical Chemistry B |
Volume | 117 |
Issue number | 25 |
DOIs | |
Publication status | Published - 2013 Jun 27 |
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry