Gallium(III) iodide is the inorganic compound with the formula GaI<sub>3</sub>. A yellow hygroscopic solid, it is the most common iodide of gallium. In the chemical vapor transport method of growing crystals of gallium arsenide uses iodine as the transport agent. In the solid state, it exists as the dimer Ga<sub>2</sub>I<sub>6</sub>, with a diborane structure. When vaporized, its forms GaI<sub>3</sub> molecules of D<sub>3h</sub> symmetry where the GaâÂÂI distance is 2.458 Angstroms.
Gallium triiodide can be reduced with gallium metal to give a green-colored gallium(I) iodide. The nature of this species is unclear, but it is useful for the preparation of gallium(I) and gallium(II) compounds.