title: Pressure-induced phase transition in hydrogen-bonded supramolecular structure: guanidinium nitrate.
abstract: In situ Raman scattering and synchrotron X-ray diffraction have been used to investigate the effects of high pressure on the structural stability of guanidinium nitrate (C(NH(2))(3)(+).NO(3)(-), GN), a representative two-dimensional supramolecular architecture of hydrogen-bonded rosette network. This study has confirmed a structural phase transition observed by Raman scattering and X-ray diffraction at approximately 1 GPa and identified it as a space group change from C2 to P2(1). The high-pressure phase remained stable up to 22 GPa. We discussed the pressure-induced changes in N-H stretching vibration in Raman spectra and proposed that this phase transition is due to the rearrangements of the hydrogen-bonding networks.
authors.affiliation: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, P. R. China.
authors.forename: Run
authors.initials: R
authors.lastname: Wang
authors.forename: Shourui
authors.initials: S
authors.lastname: Li
authors.forename: Kai
authors.initials: K
authors.lastname: Wang
authors.forename: Defang
authors.initials: D
authors.lastname: Duan
authors.forename: Lingyun
authors.initials: L
authors.lastname: Tang
authors.forename: Tian
authors.initials: T
authors.lastname: Cui
authors.forename: Bingbing
authors.initials: B
authors.lastname: Liu
authors.forename: Qiliang
authors.initials: Q
authors.lastname: Cui
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.forename: Bo
authors.initials: B
authors.lastname: Zou
authors.forename: Guangtian
authors.initials: G
authors.lastname: Zou