Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland.
Chem Commun (Camb). 2011 Feb 21;47(7):2107-9. doi: 10.1039/c0cc02630a. Epub 2010 Dec 23.
Highly favoured N-H···O bonded honeycomb layers in guanidinium nitrate, C(NH(2))(3)(+)NO(3)(-), have been destabilized by a pressure of 0.6 GPa, and the novel motif of 3-dimensional N-H···O bonded aggregation in high-pressure phase IV determined for in situ grown single-crystal by X-ray diffraction. The mechanism of the transition involves the collapse of voids present in phases I, II and III. In the P/T phase diagram a large hysteresis of the phase IV boundaries is caused by the strongly reconstructive character of the transition and pressure dependent H-accepting capacity of oxygen atoms.
在硝酸胍，C(NH(2))(3)(+)NO(3)(-)中，高度稳定的 N-H···O 键合蜂窝层在 0.6 GPa 的压力下被破坏，新型的三维 N-H···O 键合聚集在高压相 IV 中通过 X 射线衍射确定为原位生长的单晶。转变的机制涉及到 I、II 和 III 相中存在的空隙的坍塌。在 P/T 相图中，由于转变的强烈重构特性和氧原子的压力依赖的 H 接受能力，相 IV 边界的大滞后现象。
