Dibromine monoxide

Dibromine monoxide is the chemical compound composed of bromine and oxygen with the formula Br2O. It is a dark brown solid which is stable below 40°C and is used in bromination reactions.[1] It is similar to dichlorine monoxide, the monoxide of its halogen neighbor one period higher on the periodic table. The molecule is bent, with C2v molecular symmetry. The BrO bond length is 1.85Å and the BrOBr bond angle is 112°,[2][3] similar to dichlorine monoxide.

Dibromine monoxide
Names
IUPAC name
Dibromine monoxide
Systematic IUPAC name
Bromohypobromite
Other names
Dibromine oxide, bromine monoxide
Identifiers
3D model (JSmol)
ChemSpider
Properties
Br2O
Molar mass 175.807 g/mol
Appearance dark brown solid
Melting point decomposes around 17.5°C[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Reactions

Dibromine monoxide can be prepared by reacting bromine vapor or a solution of bromine in carbon tetrachloride with mercury(II) oxide at low temperatures:[1][3]

2 Br2 + 2 HgOHgBr2·HgO + Br2O

It can also be formed by thermal decomposition of bromine dioxide[2] or by passing an electrical current through a 1:5 mixture of bromine and oxygen gases.[3]

References

  1. 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. Levason, William; Ogden, J. Steven; Spicer, Mark D.; Young, Nigel A. (January 1990). "Characterization of dibromine monoxide (Br2O) by bromine K-edge EXAFS and IR spectroscopy". Journal of the American Chemical Society. 112 (3): 1019–1022. doi:10.1021/ja00159a019.
  3. Wiberg, Egon (2001). Wiberg, Nils (ed.). Inorganic chemistry (1st ed.). San Diego, Calif.: Academic Press. p. 464. ISBN 9780123526519.


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