Tungsten Di-iodide, WI₂

Tungsten Di-iodide, WI₂, is formed on passing iodine vapour over the metal heated to redness, or by heating the hexachloride at 400° to 450° C. in a current of dry hydrogen iodide. The substance is brown in colour, amorphous, infusible, insoluble in water, alcohol, and carbon disulphide. It is decomposed if sufficiently heated.