Germanium tetrabromide is the inorganic compound with the formula GeBr4. It is a colorless solid that melts near room temperature. It can be formed by treating solid germanium with bromine, or by treating a germanium-copper mixture with bromine:[2]
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| Names | |
|---|---|
| IUPAC name tetrabromogermane | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.033.270 |
| EC Number |
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PubChem CID | |
CompTox Dashboard (EPA) | |
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| Properties | |
| Br4Ge | |
| Molar mass | 392.246 g·mol−1 |
| Appearance | Colorless solid |
| Density | 2.123 g/cm3 |
| Melting point | 26 °C (79 °F; 299 K) |
| Boiling point | 185.9 °C (366.6 °F; 459.0 K) |
| Hazards | |
| GHS labelling: | |
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| Danger | |
| H314 | |
| P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501 | |
| Structure[1] | |
| α-Cubic (SnI4 type) β-Monoclinic (SnBr4 type) | |
| Thermochemistry | |
Std enthalpy of formation (ΔfH⦵298) | 83.3 kcal/mol |
| Related compounds | |
Other anions | Germanium tetrafluoride Germanium tetrachloride Germanium tetraiodide |
Other cations | Carbon tetrabromide Silicon tetrabromide Tin(IV) bromide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
- Ge + Br2 → GeBr4
From this reaction, GeBr4 has a heat of formation of 83.3 kcal/mol.[3]
The compound is liquid at 25 °C, and forms an interlocking liquid structure.[4] From room temperature down to −60 °C the structure takes on a cubic α form, whereas at lower temperatures it takes on a monoclinic β form.