Cerium(III) iodide (CeI3) is the compound formed by cerium(III) cations and iodide anions.

Cerium metal reacts with iodine when heated to form cerium(III) iodide:[2] It is also formed when cerium reacts with mercury(II) iodide at high temperatures:[2] Cerium(III) iodide adopts the plutonium(III) bromide crystal structure.

[3][4] It contains 8-coordinate bicapped trigonal prismatic Ce3+ ions.

[1] Cerium(III) iodide is used as a pharmaceutical intermediate[5] and as a starting material for organocerium compounds.

[2]