Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 113, Issue 44, Pages 14719-14724Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp9067203
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Funding
- NSFC [20773043, 20673048, 10674053]
- PCSIRT [IRT0625]
- RFDP [20060183073]
- National Basic Research Program of China [2005CB724400, 2007CB808000]
- Graduate Innovation Fund of Jilin University
- 4W2 HP-Station
- Beijing Synchrotron Radiation Facility (BSRF)
- Chinese Academy of Sciences [KJCX2-SW-N20KJCX2-SW-N03]
- [NCET-06-0313]
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Single-crystal samples of the 1:1 adduct between cyanuric acid and melamine (CA center dot M), an outstanding case of noncovalent synthesis, have been studied by Raman spectroscopy and synchrotron X-ray diffraction in a diamond anvil cell up to pressures of 15 GPa. The abrupt changes in Raman spectra around 4.4 GPa have provided convincing evidence for pressure-induced structural phase transition. This phase transition was confirmed by angle dispersive X-ray diffraction (ADXRD) experiments to be a space group change from C2/m to its subgroup P2(1)/m. On release of pressure, the observed transition was irreversible, and the new high-pressure phase was fully preserved at ambient conditions. We propose that this phase transition was due to supramolecular rearrangements brought about by changes in the hydrogen bonding networks.
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