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| Identifiers | |
|---|---|
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.033.620 |
| EC Number |
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| |
| |
| 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 | |
Otheranions | germanium(II) fluoride germanium(II) chloride germanium(II) bromide |
Othercations | tin(II) iodide lead(II) iodide |
Related compounds | germanium(IV) iodide |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Germanium(II) iodide is aniodide ofgermanium, with the chemical formula of GeI2.
Germanium(II) iodide can be produced by reactinggermanium(IV) iodide withhydriodic acid andhypophosphorous acid andwater:[1]
It can also be formed by the reaction ofgermanium monosulfide orgermanium monoxide andhydrogen iodide.[1]
It can also be produced from the direct reaction of germanium and iodine at 200 – 400 °C:[1]
Germanium(II) iodide can also be formed from the decomposition of HGeI3, which can be prepared by reacting HGeCl3 with hydroiodic acid:[5]
Germanium(II) iodide is a yellow crystal that slowly hydrolyzes into germanium(II) hydroxide in the presence of moisture. It is insoluble inhydrocarbons and slightly soluble inchloroform andcarbon tetrachloride. It has acadmium iodide structure withlattice parameters a = 413 pm and c = 679 pm.[1] It disproportionates to germanium and germanium tetraiodide at 550 °C.[6]
Germanium(II) iodide can react withcarbene to form stable compounds.[2] It is also used in the electronics industry to produce germanium layersepitaxially throughdisproportionation reactions.[7]
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