Gallium(III) iodide
Chemical compound
From Wikipedia, the free encyclopedia
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, with a diborane structure.[4] When vaporized, its forms GaI3 molecules of D3h symmetry where the Ga–I distance is 2.458 Angstroms.[5]
| |
 | |
| Names | |
|---|---|
| Other names
gallium triiodide | |
| Identifiers | |
3D model (JSmol) |
|
| ChemSpider | |
| ECHA InfoCard | 100.033.269 |
| EC Number |
|
PubChem CID |
|
CompTox Dashboard (EPA) |
|
| |
| |
| Properties | |
| 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] |
| decomposes | |
| −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: | |
   | |
| Danger | |
| H314, H317, H334, H335, H361 | |
| P280, P305+P351+P338, P310 | |
| NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
| |
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]
