Cerium diiodide is an iodide of cerium, with the chemical formula of CeI2.
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| 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).
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Preparation
editCerium diiodide can be obtained from the reduction of cerium(III) iodide with metallic cerium under vacuum at 800 °C to 900 °C.[2]
- Ce + 2 CeI3 → CeI2
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]
- Ce + 2 NH4I → CeI2 + 2 NH3 + H2
It was first created by John D. Corbett in 1961.[3]
Properties
editCerium 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]
References
edit- ^ a b Haynes, William (2012). CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data. Boca Raton, Fla. London: CRC Taylor & Francis distributor. pp. 4–56. ISBN 978-1-4398-8049-4. OCLC 793213751.
- ^ a b c Handbuch der präparativen anorganischen Chemie (in German). Stuttgart: Enke. 1975. p. 1081. ISBN 3-432-02328-6. OCLC 310719485.
- ^ Jungmann, Angelika; Claessen, R.; Zimmermann, R.; Meng, Ge; Steiner, P.; Hüfner, S.; Tratzky, S.; Stöwe, K.; Beck, H. P. (1995). "Photoemission of LaI2 and CeI2". Zeitschrift für Physik B. 97 (1). Springer Science and Business Media LLC: 25–34. Bibcode:1995ZPhyB..97...25J. doi:10.1007/bf01317584. ISSN 0722-3277. S2CID 124057481.
- ^ Macintyre, J. E. (1992). Dictionary of inorganic compounds. London New York: Chapman & Hall. p. 2820. ISBN 0-412-30120-2. OCLC 26338506.
- ^ Hulliger, Fritz (1976). Structural chemistry of layer-type phases. Dordrecht, Holland Boston: D. Reidel Pub. Co. p. 247. ISBN 90-277-0714-6. OCLC 2372807.