Cerium(III) iodide

Cerium(III) iodide
Names
	IUPAC name Triiodocerium
	Other names Cerous triiodide, Cerium triiodide
Identifiers
CAS Number	7790-87-6 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.029.299
EC Number	232-228-3;
PubChem CID	123265;
UNII	Z422836G9D ;
CompTox Dashboard (EPA)	DTXSID70999098 ;
	InChI InChI=1S/Ce.3HI/h;3*1H/q+3;;;/p-3 Key: ZEDZJUDTPVFRNB-UHFFFAOYSA-K;
	SMILES I[Ce](I)I;
Properties
Chemical formula	CeI3
Molar mass	520.829 g·mol−1
Appearance	yellow solid
Melting point	766 °C, 752 °C
Solubility in water	soluble
Solubility in acetone	soluble
Structure
Crystal structure	PuBr3
Coordination geometry	8-coordinate bicapped trigonal prismatic
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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

Preparation[edit]

Cerium metal reacts with iodine when heated to form cerium(III) iodide:^[2]

2 Ce + 3 I₂ → 2 CeI₃

It is also formed when cerium reacts with mercury(II) iodide at high temperatures:^[2]

2 Ce + 3 HgI₂ → 2 CeI₃ + 3 Hg

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]

^ ^a ^b ^c ^d Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. pp. 1240–1241. ISBN 978-0-08-037941-8.
^ ^a ^b ^c ^d ^e ^f ^g Imamoto, Tsuneo (15 April 2001). "Cerium(III) Iodide". Encyclopedia of Reagents for Organic Synthesis. John Wiley & Sons, Ltd. doi:10.1002/047084289X.rc043. ISBN 9780471936237.
^ ^a ^b Wells, A. F. (1984). Structural Inorganic Chemistry (5th ed.). Oxford University Press. p. 421. ISBN 978-0-19-965763-6.
^ ^a ^b Asprey, L. B.; Keenan, T. K.; Kruse, F. H. (1964). "Preparation and Crystal Data for Lanthanide and Actinide Triiodides". Inorg. Chem. 3 (8): 1137–1141. doi:10.1021/ic50018a015.
^ "7790-87-6 - Cerium(III) iodide, ultra dry, 99.9% (REO) - Cerium triiodide - 13641 - Alfa Aesar". alfa.com. Retrieved 2017-09-19.