Anhydrous iron(III) fluoride is white, whereas the hydrated forms are light pink.

[2] Iron(III) fluoride is a thermally robust, antiferromagnetic[3] solid consisting of high spin Fe(III) centers, which is consistent with the pale colors of all forms of this material.

The anhydrous form adopts a simple structure with octahedral Fe(III)F6 centres interconnected by linear Fe-F-Fe linkages.

Although the solid is nonvolatile, it evaporates at high temperatures, the gas at 987  °C consists of FeF3, a planar molecule of D3h symmetry with three equal Fe-F bonds, each of length 176.3 pm.

Specifically the coupling of biaryl compounds are catalyzed by hydrated iron(II) fluoride complexes of N-heterocyclic carbene ligands.

[12][13] Iron(III) fluoride has also been shown to catalyze chemoselective addition of cyanide to aldehydes to give the cyanohydrins.