Rhenium trioxynitrate

Rhenium trioxynitrate, also known as rhenium(VII) trioxide nitrate, is a chemical compound with the formula ReO3NO3. It is a white solid that readily hydrolyzes in moist air.

Preparation and properties
Rhenium trioxynitrate is prepared by the reaction of ReO3Cl (produced by reacting rhenium trioxide and chlorine) and dinitrogen pentoxide:
 * ReO3Cl + N2O5 → ReO3NO3 + NO2Cl

The ReO3Cl can be replaced with rhenium heptoxide, however, this produces an impure product. This compound reacts with water to produce perrhenic acid and nitric acid.

When heated above 75 °C, it decomposes to rhenium heptoxide, nitrogen dioxide, and oxygen:
 * 4 ReO3NO3 → 2 Re2O7 + 2 NO2 + O2

A graphite intercalation compound can be produced by reacting a mixture of rhenium trioxynitrate and dinitrogen pentoxide with graphite.

Structure
X-ray diffraction and IR spectroscopic evidence rejects the formulations NO2+ReO4– or Re2O7·N2O5, but instead suggests a polymeric structure with a monodentate nitrate ligand.