Dibromine pentoxide
IUPAC name
Dibromine pentoxide
Other names
Bromine pentoxide
3D model (JSmol)
  • InChI=1S/Br2O5/c3-1(4)7-2(5)6
  • O=[Br](=O)O[Br](=O)=O
Molar mass 239.805 g/mol
Appearance colorless solid
Melting point decomposes around −20°C[1]
Related compounds
Other anions
Bromine dioxide
Bromine trifluoride
Bromine pentafluoride
Other cations
Oxygen difluoride
Dichlorine monoxide
Chlorine dioxide
Iodine dioxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Dibromine pentoxide is the chemical compound composed of bromine and oxygen with the formula Br2O5. It is a colorless solid that is stable below −20 °C. It has the structure O2Br−O−BrO2, the Br−O−Br bond is bent with bond angle 121.2°. Each BrO3 group is pyramidal with the bromine atom at the apex.[2]


Dibromine pentoxide can be prepared by reacting a solution of bromine in dichloromethane with ozone at low temperatures and recrystallized from propionitrile.[1][2]


  1. ^ a b Perry, Dale L.; Phillips, Sidney L. (1995), Handbook of Inorganic Compounds, CRC Press, p. 74, ISBN 0-8493-8671-3, retrieved 25 August 2015
  2. ^ a b Wiberg, Egon (2001). Wiberg, Nils (ed.). Inorganic chemistry (1st ed.). San Diego, Calif.: Academic Press. p. 464. ISBN 9780123526519.