Phosphorus pentabromide
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Template:Chembox image cellTemplate:Chembox image cellTemplate:Chembox AllOtherNamesTemplate:Chembox headerbarTemplate:Chembox IndexlistTemplate:Chembox JmolTemplate:Chembox ChEMBLTemplate:Chembox ECHATemplate:Chembox E numberTemplate:Chembox IUPHAR ligandTemplate:Chembox UNIITemplate:Chembox CompToxTemplate:Chembox headerbarTemplate:Chembox SolubilityInWaterTemplate:Chembox headerbarTemplate:Chembox OHS (set)Template:Chembox GHS (set)Template:Chembox headerbarTemplate:Chembox Datapage checkTemplate:Chembox Footer| Template:Longitem | Template:Unbulleted list |
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| UN number | 2691 |
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| Molar mass | Template:Chem molar mass |
| Appearance | Yellow crystalline solid[1] |
| Density | 3.61 g/cm3 |
| Melting point | Template:Chembox CalcTemperatures |
| Boiling point | Template:Chembox CalcTemperatures |
| Solubility | Decomposes in ethanol Soluble in [[carbon tetrachloride|Template:Chem2]] and [[carbon disulfide|Template:Chem2]] |
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Phosphorus pentabromide is a reactive, yellow solid of formula Template:Chem2, which has the structure Template:Chem2 (tetrabromophosphonium bromide) in the solid state but in the vapor phase is completely dissociated to Template:Chem2 and Template:Chem2. Rapid cooling of this phase to 15 K leads to formation of the ionic species phosphorus heptabromide (tetrabromophosphonium tribromide Template:Chem2).[2]
It can be used in organic chemistry to convert carboxylic acids to acyl bromides. It is highly corrosive. It strongly irritates skin and eyes.[1] It decomposes above 100 °C to give phosphorus tribromide and bromine:[3]
Reversing this equilibrium to generate Template:Chem2 by addition of Template:Chem2 to Template:Chem2 is difficult in practice because the product is susceptible to further addition to yield phosphorus heptabromide Template:Chem2.[4]
References
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