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Preparation

Cerium diiodide can be obtained from the reduction of cerium(III) iodide with metallic cerium under vacuum at 800 °C to 900 °C.¹

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

Properties

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.⁴ Like lanthanum diiodide and praseodymium diiodide, the cerium diiodide forms in the MoSi2-type structure,⁵ with space group I4/mmm (No. 139).⁶

References

1. Handbuch der präparativen anorganischen Chemie (in German). Stuttgart: Enke. 1975. p. 1081. ISBN 3-432-02328-6. OCLC 310719485. 3-432-02328-6 ↩

2. Handbuch der präparativen anorganischen Chemie (in German). Stuttgart: Enke. 1975. p. 1081. ISBN 3-432-02328-6. OCLC 310719485. 3-432-02328-6 ↩

3. 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. /wiki/Bibcode_(identifier) ↩

4. Handbuch der präparativen anorganischen Chemie (in German). Stuttgart: Enke. 1975. p. 1081. ISBN 3-432-02328-6. OCLC 310719485. 3-432-02328-6 ↩

5. Macintyre, J. E. (1992). Dictionary of inorganic compounds. London New York: Chapman & Hall. p. 2820. ISBN 0-412-30120-2. OCLC 26338506. 0-412-30120-2 ↩

6. 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. 90-277-0714-6 ↩