What is "dioxygen difluoride"

n. (context inorganic compound English) The binary compound of oxygen and fluorine O₂F₂; it is explosive.

Dioxygen difluoride is a compound of fluorine and oxygen with the molecular formula . It can exist as an orange-colored solid which melts into a red liquid at . It is an extremely strong oxidant and decomposes into oxygen and fluorine even at at a rate of 4% per day: its lifetime at room temperature is thus extremely short. Dioxygen difluoride reacts vigorously with nearly every chemical it encounters – even ordinary ice – leading to its onomatopoeic nickname "FOOF" (a play on its chemical structure and its explosive tendencies).