Gallium(III) iodide

Gallium(III) iodide
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Template:Longitem	GaI3
Molar mass	450.436 g/mol
Appearance	light yellow powder
Density	4.5 g/cm3
Melting point	Template:Chembox CalcTemperatures
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Template:Longitem	−149.0·10−6 cm3/mol
Template:Longitem	100 J/(mol·K)
Template:Longitem	205.0 J/(mol·K)
Template:Longitem	−238.9 kJ/mol

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Gallium(III) iodide is the inorganic compound with the formula Ga I₃. A yellow hygroscopic solid, it is the most common iodide of gallium.^[2] 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 Ga₂I₆, with a diborane structure.^[3] When vaporized, its forms GaI₃ molecules of D_3h symmetry where the Ga–I distance is 2.458 Angstroms.^[4]

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.^[5]^[6]