Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chemical compound
Phosphorus pentabromide is a reactive, yellow solid of formula PBr5, which has the structure [PBr4]+Br− (tetrabromophosphonium bromide) in the solid state but in the vapor phase is completely dissociated to PBr3 and Br2. Rapid cooling of this phase to 15 K leads to formation of the ionic species phosphorus heptabromide (tetrabromophosphonium tribromide [PBr4]+[Br3]−).[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]
PBr5 → PBr3 + Br2
Reversing this equilibrium to generate PBr5 by addition of Br2 to PBr3 is difficult in practice because the product is susceptible to further addition to yield phosphorus heptabromide [PBr4]+[Br3]−.[4]
^ abcdef"Phosphorus pentabromide".
^Corbridge, D. E. C. (2013). Phosphorus: Chemistry, Biochemistry and Technology, Sixth Edition. CRC Press. p. 154. ISBN 978-1-4398-4088-7.
^Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
^Popov, A. I.; Skelly, N. E. (1954). "Spectrophotometric Study of Phosphorus Pentabromide in Various Solvents". J. Am. Chem. Soc. 76 (15): 3916–3919. doi:10.1021/ja01644a014.
and 19 Related for: Phosphorus pentabromide information
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crystals. PBr7 can be prepared by the sublimation of a mixture of phosphoruspentabromide and bromine. PBr5 + Br2 → PBr7 The structure of PBr7 consists of...
positions by the Berry pseudorotation mechanism. Phosphorus pentachloride, phosphoruspentabromide, and phosphorus heptabromide are ionic in the solid and liquid...
Phosphorus pentachloride is the chemical compound with the formula PCl5. It is one of the most important phosphorus chlorides/oxychlorides, others being...
Phosphorus tribromide is a colourless liquid with the formula PBr3. The liquid fumes in moist air due to hydrolysis and has a penetrating odour. It is...
Phosphorus pentafluoride, PF5, is a phosphorus halide. It is a colourless, toxic gas that fumes in air. Phosphorus pentafluoride was first prepared in...
phosphorus pentabromide and phosphorus pentoxide: 3 PBr5 + P2O5 → 5 POBr3 It can also be prepared via the slow addition of liquid bromine to phosphorus tribromide...
"Mechanism of the von Braun amide degradations with carbonyl bromide or phosphoruspentabromide". Tetrahedron. 29 (21): 3309–3327. doi:10.1016/S0040-4020(01)93483-0...
carboxylic acids with phosgene, thionyl chloride, and phosphorus trichloride Phosphoruspentabromide is used for acyl bromides, which are rarely of value...
Phosphorus pentaiodide is a hypothetical inorganic compound with formula PI5. The existence of this compound has been claimed intermittently since the...
Bromides and iodides of rhenium are also well known, including rhenium pentabromide and rhenium tetraiodide. Like tungsten and molybdenum, with which it...
to form rhenium hexachloride, but with bromine it forms only rhenium pentabromide and iodine can achieve only rhenium tetraiodide. By the same token, however...
to form rhenium hexachloride, but with bromine it forms only rhenium pentabromide and iodine can achieve only rhenium tetraiodide. By the same token, however...
T. J.; Smith, A. J. (1969). "The crystal structure of β-protactinium pentabromide". Acta Crystallographica B. 25 (2): 178. Bibcode:1969AcCrB..25..178B...
T. J.; Smith, A. J. (1969). "The crystal structure of β-protactinium pentabromide". Acta Crystallographica B. 25 (2): 178. Bibcode:1969AcCrB..25..178B...
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