Chromium fluoride

Chromium fluoride primarily refers to chromium(III) fluoride (CrF3), an inorganic compound appearing as a green crystalline solid. It forms several hydrates, such as violet [Cr(H2O)6]F3 and green [Cr(H2O)6]F3·3H2O, which are soluble in water, whereas the anhydrous CrF3 is insoluble. The anhydrous form melts above 1100°C and sublimes between 1100 and 1200°C, with a rhombohedral crystal structure. Chromium(III) fluoride is paramagnetic and features octahedral coordination of chromium by fluoride ligands, which bridge adjacent chromium centers.​

It is prepared by reactions involving chromium(III) oxide with hydrofluoric acid or chromium chloride with hydrogen fluoride. Due to its fluoride content, it is corrosive to metals and tissues and reacts with water slowly to release hydrofluoric acid, which is highly toxic and can cause severe chemical burns. It finds use in printing, dyeing, metal fluorides synthesis, and as a catalyst.​

Other related chromium fluorides include chromium(V) fluoride (CrF5) and chromyl fluoride (CrO2F2), which are different compounds with distinct properties.​