Tribromine octoxide
Tribromine octoxide is a binary inorganic compound of bromine and oxygen with the chemical formula . This is a free radical and one of the most complex bromine oxides.

Synthesis
A reaction of  with  at 273 K and low pressure.

Physical properties
The compound forms white solid. It exists in two forms, both are soluble in water. Unstable above 200 K

References

Bromine compounds
Oxides
Free radicals