Titanium(III) iodide is an inorganic compound with the formula TiI3.

It is a dark violet solid that is insoluble in solvents, except upon decomposition.

[3] In terms of its structure, the compound exists as a polymer of face-sharing octahedra.

Above 323 K, the Ti---Ti spacing are equal, but below that temperature, the material undergoes a phase transition.

In the low temperature phase, the Ti---Ti contacts are alternating short and long.