Phosphorus pentabromide
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| Phosphorus pentabromide | |
|---|---|
| Other names | Phosphorus(V) bromide |
| Molecular formula | PBr5 |
| Molar mass | 430.49 g/mol |
| CAS number | [7789-69-7] |
| Density | g/cm3 |
| Solubility (water) | Decomposes |
| Melting point | ca. 100 °C
(decomposes) |
| Boiling point | 106 °C
(decomposes) |
| Disclaimer and references | |
Phosphorus pentabromide is a reactive yellow solid of formula PBr5, which has the structure PBr4+ Br− in the solid state but in the vapor phase is completely disociated to PBr3 and Br2. Rapid cooling of this phase to 15 K leads to formation of an ionic species [PBr4]+[Br3]-.
It can be used in organic chemistry to convert carboxylic acids to acyl bromides. It is highly corrosive and should be handled with care. It decomposes above 100 °C to give phosphorus tribromide and bromine:
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