Peroxynitrate (or peroxonitrate) refers to

salt Salt is a mineral composed primarily of sodium chloride (NaCl), a chemical compound belonging to the larger class of salts; salt in the form of a natural crystalline mineral is known as rock salt or halite. Salt is present in vast quantitie ...

s of the unstable

peroxynitric acid Peroxynitric acid or peroxonitric acid is a chemical compound with the chemical formula, formula . It is an oxyacid of nitrogen, after peroxynitrous acid. Preparation Peroxynitrate, the conjugate base of peroxynitric acid, is formed rapidly duri ...

, HNO₄. Peroxynitrate is unstable and decomposes to nitrate and dioxygen. No solid peroxynitrate salts are known. However, there is a report that the Russian chemist

Sebastian Moiseevich Tanatar Sevast’ian (or Sebastian) Moiseevich Tanatar (Севастьян Моисеевич Танатар) (Oct 7 (19) 1849, Odessa–Nov 30 (Dec 13) 1917) was a Russian chemist. He was born into a family of Karaite merchants in Odessa. When he w ...

produced sodium peroxynitrate octahydrate ( NaNO₃. H₂O₂.8H₂O) by evaporating a solution of

sodium nitrate Sodium nitrate is the chemical compound with the formula . This alkali metal nitrate salt is also known as Chile saltpeter (large deposits of which were historically mined in Chile) to distinguish it from ordinary saltpeter, potassium nitrate. T ...

and

hydrogen peroxide Hydrogen peroxide is a chemical compound with the formula . In its pure form, it is a very pale blue liquid that is slightly more viscous than water. It is used as an oxidizer, bleaching agent, and antiseptic, usually as a dilute solution (3%� ...

until crystallisation begins and then mixing with alcohol to form crystals of the octahydrate.

References

Oxyanions {{inorganic-compound-stub