 | |
| Identifiers | |
|---|---|
3D model (JSmol) | |
| |
| |
| Properties | |
| CeI2 | |
| Molar mass | 393.925 g·mol−1 |
| Appearance | bronze solid[1] |
| Melting point | 808 °C[1] |
| Structure | |
| I4/mmm (No. 139) | |
| Related compounds | |
Othercations | lanthanum diiodide praseodymium diiodide neodymium(II) iodide |
Related compounds | cerium(III) iodide |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Cerium diiodide is aniodide ofcerium, with thechemical formula of CeI2.
Cerium diiodide can be obtained from the reduction ofcerium(III) iodide with metalliccerium under vacuum at 800 °C to 900 °C.[2]
It can also be formed from the reaction of cerium andammonium iodide in liquidammonia at −78 °C. The reaction forms an ammonia complex of cerium diiodide, which decomposes to cerium diiodide under vacuum at 200 °C.[2]
It was first created byJohn D. Corbett in 1961.[3]
Cerium diiodide is an opaque dark solid with a metal-like appearance and properties. There is no cerium(II) in cerium diiodide, and its real structure is Ce3+(I−)2e−. It is easilyhydrolyzed to form the correspondingoxyiodide.[2] Likelanthanum diiodide andpraseodymium diiodide, the cerium diiodide forms in theMoSi2-type structure,[4] withspace groupI4/mmm (No. 139).[5]