Phosphorus pentabromide
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).[1]
It can be used in organic chemistry to convert carboxylic acids to acyl bromides. It is highly corrosive. It strongly irritates skin and eyes.[2] 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
Template:Reflist Template:Phosphorus compounds Template:Bromides
- ↑ Script error: No such module "citation/CS1".
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedpubchem - ↑ Template:Greenwood&Earnshaw
- ↑ Script error: No such module "Citation/CS1".