Cerium(III) iodide (CeI₃) is the compound formed by

cerium Cerium is a chemical element with the symbol Ce and atomic number 58. Cerium is a soft, ductile, and silvery-white metal that tarnishes when exposed to air. Cerium is the second element in the lanthanide series, and while it often shows the +3 o ...

(III) cations and

iodide An iodide ion is the ion I−. Compounds with iodine in formal oxidation state −1 are called iodides. In everyday life, iodide is most commonly encountered as a component of iodized salt, which many governments mandate. Worldwide, iodine def ...

anions.

Preparation

Cerium metal reacts with iodine when heated to form cerium(III) iodide: : It is also formed when cerium reacts with

mercury(II) iodide Mercury(II) iodide is a chemical compound with the molecular formula Hg I2. It is typically produced synthetically but can also be found in nature as the extremely rare mineral coccinite. Unlike the related mercury(II) chloride it is hardly sol ...

at high temperatures: :

Structure

Cerium(III) iodide adopts the

plutonium(III) bromide Plutonium(III) bromide is an inorganic salt of bromine and plutonium with the formula PuBr3. This radioactive green solid has few uses, however its crystal structure is often used as a structural archetype in crystallography. Crystal structure ...

crystal structure. It contains 8-coordinate

bicapped trigonal prismatic In chemistry, the bicapped trigonal prismatic molecular geometry describes the shape of compounds where eight atoms or groups of atoms or ligands are arranged around a central atom defining the vertices of a biaugmented triangular prism. This sha ...

Ce³⁺ ions.

Uses

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

References

{{Lanthanide halides Cerium(III) compounds Iodides Lanthanide halides