Pressure-induced phase transition in hydrogen-bonded supramolecular adduct formed by cyanuric acid and melamine


Autoria(s): Wang, Kai; Duan, Defang; Wang, Run; Liu, Dan; Tang, Lingyun; Cui, Tian; Liu, Bingbing; Cui, Qiliang; Liu, Jing; Zou, Bo; Zou, Guangtian
Data(s)

15/10/2009

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

http://hdl.handle.net/10536/DRO/DU:30048630

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