Titanium Di-iodide, TiI₂

Titanium Di-iodide, TiI₂, has been prepared by Defacqz and Copaux by heating the tetra-iodide in mercury vapour conveyed in a current of hydrogen. It forms black, hygroscopic leaflets which are nonvolatile and infusible and have a density of 4.3. It is insoluble in organic solvents, but decomposed by water and aqueous alkalis; boiling hydrochloric acid dissolves it, forming a blue liquid; aqueous ammonia forms the black hydroxide; heating in oxygen yields titanic oxide and iodine.