Polonium dibromide

Polonium dibromide is a chemical compound with the formula Po Br₂. This salt is a purple-brown crystalline solid at room temperature. It sublimes at 110 °C/30 μ and decomposes when melted in nitrogen gas at 270–280 °C.

Preparation

Polonium dibromide may be prepared by:

thermal degradation of polonium tetrabromide in a vacuum at 200 °C;
dehalogenation of polonium tetrabromide by hydrogen sulfide at low temperatures.

Chemistry

Polonium dibromide forms purple solutions in hydrobromic acid and ketones, although the latter are rapidly oxidised to polonium. Solid polonium dibromide is rapidly reduced to metallic polonium upon reaction with ammonia.