Polonium sulfide

Polonium sulfide is an inorganic compound of polonium and sulfur with the chemical formula PoS. The compound is radioactive and forms black crystals.

Synthesis

1. Passing hydrogen sulfide through an acidic solution of a polonium salt:
2. Reaction of ammonium sulfide aqueous solution with polonium hydroxide:

Physical properties

Polonium sulfide forms black solid crystals, insoluble in water, ammonium sulfide, ethanol, acetone, or toluene.

Chemical properties

Polonium sulfide has strong reducing properties and can be oxidized by chlorine water, bromine water, sodium hypochlorite, and aqua regia. Polonium sulfide is also unstable to heating. It decomposes into elemental polonium and elemental sulfur when heated to 274.85°C in a vacuum:
Reacts with concentrated acids:

Applications

Used in the isolation and purification of polonium.