Dibromine trioxide

Dibromine trioxide is the chemical compound composed of bromine and oxygen with the formula Br2O3. It is an orange solid that is stable below &minus;40 °C. It has the structure Br&minus;O&minus;BrO2 (bromine bromate). It was discovered at 1993. The bond angle of Br&minus;O&minus;Br is 111.7°, the bond angle of O&minus;Br=O is 103.1°, and the bond angle of O=Br=O is 107.6°. The Br&minus;OBrO2 bond length is 1.845Å, the O&minus;BrO2 bond length is 1.855Å, and the Br=O bond length is 1.612Å.

Reactions
Dibromine trioxide can be prepared by reacting a solution of bromine in dichloromethane with ozone at low temperatures. It disproportionates in alkali solutions to Br$&minus;$ and BrO$&minus; 3$.