| Autor: |
Gaydamaka AA; Novosibirsk State University, Pirogova Street 2, Novosibirsk, 630090, Russian Federation., Rashchenko SV; Novosibirsk State University, Pirogova Street 2, Novosibirsk, 630090, Russian Federation., Semerikova AI; Novosibirsk State University, Pirogova Street 2, Novosibirsk, 630090, Russian Federation., Smirnova ES; FSRC 'Crystallography and Photonics' RAS, Leninskii Avenue 59, Moscow, 119333, Russian Federation., Ivanova AG; FSRC 'Crystallography and Photonics' RAS, Leninskii Avenue 59, Moscow, 119333, Russian Federation., Arkhipov SG; Novosibirsk State University, Pirogova Street 2, Novosibirsk, 630090, Russian Federation., Zakharov BA; Novosibirsk State University, Pirogova Street 2, Novosibirsk, 630090, Russian Federation., Bogdanov NE; Novosibirsk State University, Pirogova Street 2, Novosibirsk, 630090, Russian Federation., Boldyreva EV; Novosibirsk State University, Pirogova Street 2, Novosibirsk, 630090, Russian Federation. |
| Abstrakt: |
The crystal structure of potassium guaninate hydrate, K + ·C 5 H 4 N 5 O - ·H 2 O, was studied in the pressure range of 1 atm to 7.3 GPa by single-crystal diffraction using synchrotron radiation and a laboratory X-ray diffraction source. Structural strain was compared to that of the same salt hydrate on cooling, and in 2Na + ·C 5 H 3 N 5 O 2- ·7H 2 O under hydrostatic compression and on cooling. A polymorphic transition into a new, incommensurately modulated, phase was observed at ∼4-5 GPa. The transition was reversible with a hysteresis: the satellite reflections disappeared on decompression to ∼1.4 GPa. |
