Gallium(III) iodide

Gallium(III) iodide is the inorganic compound with the formula GaI₃. A yellow hygroscopic solid, it is the most common iodide of gallium.^[3] 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.^[4] When vaporized, its forms GaI₃ molecules of D_3h symmetry where the Ga–I distance is 2.458 Angstroms.^[5]

Gallium(III) iodide

Names
Other names gallium triiodide
Identifiers
CAS Number	13450-91-4 N
3D model (JSmol)	Interactive image
ChemSpider	75316 Y
ECHA InfoCard	100.033.269
EC Number	236-611-6
PubChem CID	83478
CompTox Dashboard (EPA)	DTXSID7065467
InChI InChI=1S/Ga.3HI/h;3*1H/q+3;;;/p-3 Y Key: DWRNSCDYNYYYHT-UHFFFAOYSA-K Y InChI=1/Ga.3HI/h;3*1H/q+3;;;/p-3 Key: DWRNSCDYNYYYHT-DFZHHIFOAW
SMILES I[Ga](I)I
Properties
Chemical formula	GaI3
Molar mass	450.436 g/mol
Appearance	light yellow powder
Density	4.5 g/cm3[1]
Melting point	212 °C (414 °F; 485 K)[1]
Boiling point	340 °C (644 °F; 613 K)[1]
Solubility in water	decomposes
Magnetic susceptibility (χ)	−149.0·10−6 cm3/mol
Thermochemistry[2]
Heat capacity (C)	100 J/(mol·K)
Std molar entropy (S⦵298)	205.0 J/(mol·K)
Std enthalpy of formation (ΔfH⦵298)	−238.9 kJ/mol
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H314, H317, H334, H335, H361
Precautionary statements	P280, P305+P351+P338, P310
NFPA 704 (fire diamond)	4 0 1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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.^[6][7]

See also

• Gallium halides

References

1. Haynes, p. 4.63
2. Haynes, p. 5.20
3. Donges, E. (1963). "Gallium(III) Iodide". In Brauer, G. (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 1. NY, NY: Academic Press. p. 846.
4. Brünig, C.; Locmelis, S.; Milke, E.; Binnewies, M. (2006). "Chemischer Transport fester Lösungen. 27. Mischphasenbildung und chemischer Transport im System Zn Se/Ga As". Zeitschrift für Anorganische und Allgemeine Chemie. 632 (6): 1067–1072. doi:10.1002/zaac.200600008.
5. Haynes, p. 9.23
6. Baker, Robert J.; Jones, Cameron (2005). ""GaI": A versatile reagent for the synthetic chemist". Dalton Trans (8): 1341–1348. doi:10.1039/b501310k. hdl:2262/69572. PMID 15824768.
7. Green, Shaun P.; Jones, Cameron; Stasch, Andreas; Rose, Richard P. (2007). "'GaI': A new reagent for chemo- and diastereoselective C–C bond forming reactions". New J. Chem. 31: 127–134. doi:10.1039/b613669a.

Cited sources

• Haynes, William M., ed. (2016). CRC Handbook of Chemistry and Physics (97th ed.). CRC Press. ISBN 9781498754293.