Pressure-Dependent Release of Guest Molecules and Structural Transitions in Hydroquinone Clathrate

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• 作者：Byeong-Soo Kim ; Yongjae Lee ; Ji-Ho Yoon
• 刊名：The Journal of Physical Chemistry B
• 出版年：2013
• 出版时间：June 27, 2013
• 年：2013
• 卷：117
• 期：25
• 页码：7621-7625
• 全文大小：415K
• 年卷期：v.117,no.25(June 27, 2013)
• ISSN：1520-5207

文摘

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 N₂-loaded 尾-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 尾-form HQ clathrate, indicating that the pressure-induced structural transition is fully reversible. In contrast, around 0.4 GPa, the guest-free 尾-form HQ clathrate undergoes an irreversible phase transition to the nonporous 伪-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.