Chromium(III) fluoride
Chromium(III) fluoride (CrF3) is an inorganic chemical compound. It exists in two forms: anhydrous chromium(III) fluoride and hydrated chromium(III) fluoride.
The anhydrous form is a green crystalline solid that is insoluble in water. It is a polymeric material consisting of CrF6 octahedra linked by shared fluorine atoms. It is commonly produced by the reaction of chromium(III) oxide with hydrogen fluoride.
The hydrated form, CrF3•xH2O (where x typically ranges from 3 to 9), is a water-soluble, violet or green solid. Its color depends on the degree of hydration and the specific coordination complex formed in solution. The hydrated form is typically prepared by dissolving chromium(III) oxide or chromium(III) hydroxide in hydrofluoric acid.
Chromium(III) fluoride is used in the production of certain catalysts, in the fluorination of organic compounds, and as a mordant in dyeing textiles. It also finds use in some ceramic and glass applications.
The compound should be handled with care, as fluorides are generally toxic. It is a skin and respiratory irritant.