Phosphoryl bromide

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Phosphoryl bromide
Skeletal formula of phosphoryl bromide
Space-filling model of the phosphoryl bromide molecule
Other names
Phosphorus oxybromide
3D model (JSmol)
ECHA InfoCard 100.029.252
Molar mass 286.69 g/mol
Density 2.82 g cm−3
Melting point 56 °C (133 °F; 329 K)
Boiling point 192 °C (378 °F; 465 K)
Corrosive C
R-phrases (outdated) R14, R34, R37
S-phrases (outdated) S7/8, S26, S36/37/39, S43, S45
Related compounds
Related compounds
Phosphorus tribromide
Thiophosphoryl bromide
Phosphoryl fluoride
Phosphoryl chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Phosphoryl bromide, also known as phosphorus oxybromide, is an inorganic compound with the formula POBr3. It can be prepared via the slow addition of liquid bromine to phosphorus tribromide at 0 °C, followed by the slow addition of water and vacuum distillation of the resulting slurry.

It is prepared according to the equation: 3 PBr5 + P2O5 → 5 POBr3[1][2]


Thin plates, faint orange tint, d 2.822. mp 56° (in hot water). bp758 193° (decomposes). Slowly hydrolyzes in water forming H3PO4 and HBr. Soluble in ether, benzene, chloroform, carbon disulfide, concentrated H2SO4. Store in sealed glass ampoules.


[3] [4] [5]

  1. ^ Hönigschmid, Hirschbold-Wittner, Z. Anorg. Allg. Chem. 243, 355 (1940)
  2. ^ Johnson, Nunn, J. Am. Chem. Soc. 63, 141 (1941); Booth, Seegmiller, Inorg. Synth. 2, 151 (1946)
  3. ^ Jacob, E. Jean, Donald D. Danielson, and Svein Samdal. "An electron diffraction determination of the molecular structures of phosphoryl bromide and thiophosphoryl bromide." Journal of Molecular Structure 62 (1980): 143-155.
  4. ^ Bell, I. S., P. A. Hamilton, and P. B. Davies. "Infrared Diode–Laser Spectroscopy of Phosphoryl Bromide (BrPO)." Journal of molecular spectroscopy 195.2 (1999): 340-344.
  5. ^ Okuda, Tsutomu, et al. "Structural study of phosphoryl bromide by means of nuclear quadrupole resonance." Inorganic Chemistry 14.5 (1975): 1207-1209.