title: Pressure-induced collapse of guanidinium nitrate N-H···O bonded honeycomb layers into a 3-D pattern with varied H-acceptor capacity.
abstract: 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.
authors.affiliation: Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland. katran@amu.edu.pl
authors.forename: Andrzej
authors.initials: A
authors.lastname: Katrusiak
authors.forename: Marek
authors.initials: M
authors.lastname: Szafrański
authors.forename: Marcin
authors.initials: M
authors.lastname: Podsiadło
mesh_terms: D003460:Crystallization; D004553:Electric Conductivity; D019791:Guanidine / Q000737:chemistry*; D006860:Hydrogen Bonding; D008958:Models, Molecular; D009566:Nitrates / Q000737:chemistry*; D044367:Phase Transition; D011312:Pressure
chemical_list: D009566:Nitrates; D019791:Guanidine