Thorium triiodide

Thorium triiodide is a binary inorganic compound of thorium metal and iodine with the chemical formula ThI3.

Synthesis
Th metal is heated with ThI4 in a vacuum at 800 °C.
 * Th + 3ThI4 -> 4ThI3

Physical properties
The compound forms black or grey crystals.

Chemical properties
ThI3 reacts with water.