Pressure-dependent release of guest molecules and structural transitions in hydroquinone clathrate

Byeong Soo Kim, Yongjae Lee, Ji Ho Yoon

Research output: Contribution to journalArticle

5 Citations (Scopus)

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 languageEnglish
Pages (from-to)7621-7625
Number of pages5
JournalJournal of Physical Chemistry B
Volume117
Issue number25
DOIs
Publication statusPublished - 2013 Jun 27

Fingerprint

clathrates
Molecules
molecules
Hydrogen
Phase transitions
hydrogen
Synchrotrons
synchrotrons
Raman spectroscopy
hydroquinone
Crystal structure
crystal structure
X ray diffraction
diffraction
spectroscopy
x rays

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

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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.",
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Pressure-dependent release of guest molecules and structural transitions in hydroquinone clathrate. / Kim, Byeong Soo; Lee, Yongjae; Yoon, Ji Ho.

In: Journal of Physical Chemistry B, Vol. 117, No. 25, 27.06.2013, p. 7621-7625.

Research output: Contribution to journalArticle

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AB - 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.

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