Bromine dioxide

"BrO2" redirects here. For the oxyanion with the formula BrO⁻
₂, see Bromite.

Bromine dioxide is the chemical compound composed of bromine and oxygen with the formula BrO₂. It forms unstable yellow^[2] to yellow-orange^[1] crystals. It was first isolated by R. Schwarz and M. Schmeißer in 1937 and is hypothesized to be important in the atmospheric reaction of bromine with ozone.^[3] It is similar to chlorine dioxide, the dioxide of its halogen neighbor one period higher on the periodic table.^{[citation needed]}

Bromine dioxide

Names
IUPAC name Bromine dioxide
Identifiers
CAS Number	21255-83-4 Y
3D model (JSmol)	Interactive image
ChemSpider	4574124 N
PubChem CID	5460629
InChI InChI=1S/BrO2/c2-1-3 N Key: SISAYUDTHCIGLM-UHFFFAOYSA-N N InChI=1/BrO2/c2-1-3 Key: SISAYUDTHCIGLM-UHFFFAOYAZ
SMILES O=Br=O
Properties
Chemical formula	BrO2
Molar mass	111.903 g/mol[1]
Appearance	unstable yellow crystals
Melting point	decomposes around 0°C [2]
Related compounds
Other anions	Bromine monoxide 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). N verify (what is YN ?) Infobox references

Reactions

Bromine dioxide is formed when an electric current is passed through a mixture of bromine and oxygen gases at low temperature and pressure.^[4]

Bromine dioxide can also be formed by the treatment of bromine gas with ozone in trichlorofluoromethane at −50 °C.^[1]

When mixed with a base, bromine dioxide gives the bromide and bromate anions:^[4]

6 BrO₂ + 6 NaOH → NaBr + 5 NaBrO₃ + 3 H₂O

References

1. Perry, Dale L.; Phillips, Sidney L. (1995), Handbook of Inorganic Compounds, CRC Press, p. 74, ISBN 0-8493-8671-3, retrieved 17 March 2009
2. Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, Florida: CRC Press, p. 447, ISBN 0-8493-0594-2
3. Müller, Holger S. P.; Miller, Charles E.; Cohen, Edward A. (1997). "The rotational spectrum and molecular properties of bromine dioxide, OBrO". The Journal of Chemical Physics. 107 (20): 8292. Bibcode:1997JChPh.107.8292M. doi:10.1063/1.475030. ISSN 0021-9606.
4. Arora, M.G. (1997), P-Block Elements, New Delhi: Anmol Publications, p. 256, ISBN 978-81-7488-563-0, retrieved 17 March 2009