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. 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. When vaporized, its forms GaI3 molecules of D3h symmetry where the Ga–I distance is 2.458 Angstroms.

Gallium(III) iodide
Names
Other names
gallium triiodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.269
EC Number
  • 236-611-6
PubChem CID
  • 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
GaI3
Molar mass 450.436 g/mol
Appearance light yellow powder
Density 4.5 g/cm3
Melting point 212 °C (414 °F; 485 K)
Boiling point 340 °C (644 °F; 613 K)
decomposes
Magnetic susceptibility (χ)
 −149.0·10−6 cm3/mol
Thermochemistry
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:
Danger
H314, H317, H334, H335, H361
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.

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