Pressure-induced collapse of guanidinium nitrate N–H⋯O bonded honeycomb layers into a 3-D pattern with varied H-acceptor capacity
2011
Katrusiak, Andrzej | Szafrański, Marek | Podsiadło, Marcin
Highly favoured N–H⋯O bonded honeycomb layers in guanidinium nitrate, C(NH₂)₃⁺NO₃⁻, 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.
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