Dibromine monoxide
| Names | |
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IUPAC name
Dibromine monoxide
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| Other names
Dibromine oxide, bromine monoxide
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| Identifiers | |
21308-80-5 
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| Properties | |
| Br2O | |
| Molar mass | 175.807 g/mol |
| Appearance | dark brown solid |
| Melting point | decomposes around -17.5°C |
| Related compounds | |
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Other anions
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Bromine dioxide Bromine trifluoride Bromine pentafluoride |
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Other cations
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Oxygen difluoride Dichlorine monoxide Chlorine dioxide Iodine dioxide |
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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 | |
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. It is similar to dichlorine monoxide, the dioxide of its halogen neighbor one period higher on the periodic table. The molecule is bent, with C2vmolecular symmetry. The Br-O bond length is 1.85Å and the Br-O-Br bond angle is 112°. A related diatomic molecule bromine monoxide (CAS#15656-19-6 ).
Dibromine monoxide can be prepared by reacting bromine vapor or a solution of bromine in carbon tetrachloride with mercury(II) oxide at low temperatures:
It can also be formed by thermal decomposition of bromine dioxide or by passing an electrical current through a 1:5 mixture of bromine and oxygen gases.
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