Cerium diiodide is an iodide of cerium, with the chemical formula of CeI2.
Identifiers | |
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3D model (JSmol)
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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 | |
Other cations
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lanthanum diiodide praseodymium diiodide neodymium(II) iodide |
Related compounds
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cerium(III) iodide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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Cerium diiodide can be obtained from the reduction of cerium(III) iodide with metallic cerium under vacuum at 800 °C to 900 °C.[2]
It can also be formed from the reaction of cerium and ammonium iodide in liquid ammonia 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 by John 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 easily hydrolyzed to form the corresponding iodide oxide.[2] Like lanthanum diiodide and praseodymium diiodide, the cerium diiodide forms in the MoSi2-type structure,[4] with space group I4/mmm (No. 139).[5]