Dibromine trioxide
IUPAC name
Dibromine trioxide
Other names
Bromine trioxide
Bromine bromate
3D model (JSmol)
  • InChI=1S/Br2O3/c1-5-2(3)4
  • BrO[Br](=O)=O
Molar mass 207.806 g/mol
Appearance orange needles
Melting point decomposes around −40°C[1]
a = 1186.6 pm, b = 762.9 pm, c = 869.3 pm
α = 90°, β = 106.4°, γ = 90°
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 trioxide is the chemical compound composed of bromine and oxygen with the formula Br2O3. It is an orange solid that is stable below −40 °C. It has the structure Br−O−BrO2 (bromine bromate).[3] It was discovered at 1993.[2] The bond angle of Br−O−Br is 111.7°, the bond angle of O−Br=O is 103.1°, and the bond angle of O=Br=O is 107.6°. The Br−OBrO2 bond length is 1.845Å, the O−BrO2 bond length is 1.855Å, and the Br=O bond length is 1.612Å.[4]


Dibromine trioxide can be prepared by reacting a solution of bromine in dichloromethane with ozone at low temperatures.[3][5] It disproportionates in alkali solutions to Br
and BrO


  1. ^ Perry, Dale L.; Phillips, Sidney L. (1995), Handbook of Inorganic Compounds, CRC Press, p. 255, ISBN 0-8493-8671-3, retrieved 2015-08-25
  2. ^ a b Kuschel, Raimund; Seppelt, Konrad (1993). "Brombromat Br2O3". Angewandte Chemie. 105 (11). Wiley: 1734–1735. doi:10.1002/ange.19931051141. ISSN 0044-8249.
  3. ^ a b Henderson, K. M. Mackay; R. A. Mackay; W. (2002). Introduction to modern inorganic chemistry (6th ed.). Cheltenham: Nelson Thornes. ISBN 9780748764204.((cite book)): CS1 maint: multiple names: authors list (link)
  4. ^ Jansen, Martin; Kraft, Thorsten (1997). "The Structural Chemistry of Binary Halogen Oxides in the Solid State". Chemische Berichte. 130 (3). Wiley: 307–316. doi:10.1002/cber.19971300302. ISSN 0009-2940.
  5. ^ a b Wiberg, Egon (2001). Wiberg, Nils (ed.). Inorganic chemistry (1st ed.). San Diego, Calif.: Academic Press. p. 464. ISBN 9780123526519.