Germanium(II) iodide is an iodide of germanium, with the chemical formula of GeI2.
 | |
| Identifiers | |
|---|---|
3D model (JSmol) |
|
| ChemSpider | |
| ECHA InfoCard | 100.033.620 |
| EC Number |
|
PubChem CID |
|
CompTox Dashboard (EPA) |
|
| |
| Properties | |
| GeI2 | |
| Molar mass | 326.439 g·mol−1 |
| Appearance | yellow solid[1] |
| Density | 5.37 g·cm−3 (25 °C)[2] |
| Melting point | 428 °C[3] |
| Boiling point | 550 °C (decomposes)[3] |
| Structure | |
| P3m1 (No. 164)[4] | |
| Related compounds | |
Other anions |
germanium(II) fluoride germanium(II) chloride germanium(II) bromide |
Other cations |
tin(II) iodide lead(II) iodide |
Related compounds |
germanium(IV) iodide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
| |
Preparation
Germanium(II) iodide can be produced by reacting germanium(IV) iodide with hydriodic acid and hypophosphorous acid and water:[1]
- GeI4 + H2O + H3PO2 → GeI2 + H3PO3 + 2 HI
It can also be formed by the reaction of germanium monosulfide or germanium monoxide and hydrogen iodide.[1]
- GeO + 2 HI → GeI2 + H2O
- GeS + 2 HI → GeI2 + H2S}
It can also be produced from the direct reaction of germanium and iodine at 200 – 400 °C:[1]
- Ge + I2 → GeI2
Germanium(II) iodide can also be formed from the decomposition of HGeI3, which can be prepared by reacting HGeCl3 with hydroiodic acid:[5]
- HGeCl3 + 3 HI → HGeI3 + HCl
- HGeI3 → GeI2 + HI
Properties
Germanium(II) iodide is a yellow crystal that slowly hydrolyzes into germanium(II) hydroxide in the presence of moisture. It is insoluble in hydrocarbons and slightly soluble in chloroform and carbon tetrachloride. It has a cadmium iodide structure with lattice parameters a = 413 pm and c = 679 pm.[1] It disproportionates to germanium and germanium tetraiodide at 550 °C.[6]
Applications
Germanium(II) iodide can react with carbene to form stable compounds.[2] It is also used in the electronics industry to produce germanium layers epitaxially through disproportionation reactions.[7]
References
Wikiwand in your browser!
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.
