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Pressure-induced phase transition in hydrogen-bonded supramolecular adduct formed by cyanuric acid and melamine
journal contribution
posted on 2009-10-15, 00:00 authored by K Wang, D Duan, R Wang, Dan LiuDan Liu, L Tang, T Cui, B Liu, Q Cui, Jing Liu, B Zou, G ZouSingle-crystal samples of the 1:1 adduct between cyanuric acid and melamine (CA·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 P21/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.
History
Journal
Journal of physical chemistry bVolume
113Issue
44Pagination
14719 - 14724Publisher
American Chemical SocietyLocation
Washington, D.C.Publisher DOI
ISSN
1520-6106eISSN
1520-5207Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2009, American Chemical SocietyUsage metrics
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