Pressure-induced phase transition in hydrogen-bonded supramolecular adduct formed by cyanuric acid and melamine
Data(s) |
15/10/2009
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Resumo |
Single-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 <i>C2/m</i> to its subgroup P2<sub>1</sub>/<i>m</i>. 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. |
Identificador | |
Idioma(s) |
eng |
Publicador |
American Chemical Society |
Relação |
http://dro.deakin.edu.au/eserv/DU:30048630/wang-pressureinduced-2009.pdf http://dx.doi.org/10.1021/jp9067203 |
Direitos |
2009, American Chemical Society |
Tipo |
Journal Article |