High‐Pressure Synthesis and Study of NO+NO3− and NO2+NO3− Ionic Solids

Abstract

Nitrosonium-nitrate NO+NO3− and dinitrogen pentoxide NO2+NO3− ionic crystals were synthesized by laser heating of a condensed oxygen-rich O2-N2 mixture compressed to different pressures, up to 40 GPa, in a diamond anvil cell (DAC). High-pressure/high-temperature Raman and X-ray diffraction studies of synthesized samples disclosed a transformation of NO+NO3− compound to NO2+NO3− crystal at temperatures above ambient and pressures below 9 GPa. High-pressure experiments revealed previously unreported bands in Raman spectra of NO+NO3− and NO2+NO3− ionic crystals. Structural properties of both ionic compounds are analyzed. Obtained experimental results support a hypothesis of a rotational disorder of NO+ complexes in NO+NO3− and indicate a rotational disorder of ionic complexes in NO2+NO3− solid.

Nitrosonium and Nitronium Salts of New Mixed‐Cation Hexafluoridoantimonates(V)

“…When the N 2 O is laser heated above 1000 K at high pressures (above 10 GPa) an unusual ionic solid [NO] + [NO 3 ] − is formed [23,24] . The same compound was observed when the N 2 O 4 [25] or condensed oxygen‐rich O 2 −N 2 mixture [26] were laser heated at high pressure.…”

Crystal structures and properties of nitrogen oxides under high pressure

“…À was reported as hexagonal P6 3 /mmc 9. Recently, a new orthorhombic Pna2 1 phase of NO + NO 3 À has been reported by Xiao et al10 through theoretical studies on N 2 O, the obtained phase is more stable than the monoclinic phase.…”