Chromyl Fluoride, CrO₂F₂

Chromyl Fluoride, CrO₂F₂, was obtained by Unverdorben who, on heating a mixture of fluorspar and lead chromate with fuming sulphuric acid, observed the formation of a red gas, originally believed to be a higher fluoride of chromium, namely, CrF₆. Dumas, by cooling the gas, obtained it as a liquid. It is a blood-red liquid, decomposed by water, with the formation of chromium trioxide and hydrogen fluoride,

CrO₂F₂ + H₂O = CrO₃ + 2HF.

It acts on glass, forming silicon tetrafluoride, and with ammonium chromate, a fluo-chromate is formed.