Dibromine pentoxide is the chemical compound composed of bromine and oxygen with the formula Br2O5. It is a colorless solid that is stable below -20 °C. It has the structure O2Br-O-BrO2, the Br-O-Br bond is bent with bond angle 121.2°. Each BrO3 group is pyramidal with the bromine atom at the apex.[1]
Dibromine pentoxide can be prepared by reacting a solution of bromine in dichloromethane with ozone at low temperatures and recrystallized from propionitrile.[1]