Effect of High Pressure on the Typical Supramolecular Structure of Guanidinium Methanesulfonate
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- 作者：Shourui Li ; Qian Li ; Jing Zhou ; Run Wang ; Zhangmei Jiang ; Kai Wang ; Dapeng Xu ; Jing Liu ; Bingbing Liu ; Guangtian Zou ; Bo Zou
- 刊名：The Journal of Physical Chemistry B
- 出版年：2012
- 出版时间：March 15, 2012
- 年：2012
- 卷：116
- 期：10
- 页码：3092-3098
- 全文大小：451K
- 年卷期：v.116,no.10(March 15, 2012)
- ISSN：1520-5207
文摘
We report the high-pressure response of guanidinium methanesulfonate (C(NH2)3+路CH3SO3鈥?/sup>, GMS) using in situ Raman spectroscopy and synchrotron X-ray diffraction (XRD) techniques up to the pressures of 11 GPa. GMS exhibits the representative supramolecular structure of two-dimensional (2D) hydrogen-bonded bilayered motifs under ambient conditions. On the basis of the experimental results, two phase transitions were identified at 0.6 and 1.5 GPa, respectively. The first phase transition, which shows the reconstructive feature, is ascribed to the rearrangements of hydrogen-bonded networks, resulting in the symmetry transformation from C2/m to Pnma. The second one proves to be associated with local distortions of methyl groups, accompanied by the symmetry transformation from Pnma to Pna21. The cooperativity of hydrogen bonding, electrostatic, and van der Waals interactions, as well as mechanisms for the phase transitions is discussed by means of the local nature of the structure.
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