Lanthanum diiodide
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| Identifiers | |
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3D model (JSmol)
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| Properties | |
| I2La | |
| Molar mass | 392.71441 g·mol−1 |
| Appearance | blue-black solid[1] |
| Density | 5.46 g/cm−3[1] |
| Melting point | 830 °C[1] |
| Related compounds | |
Other cations
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cerium diiodide praseodymium diiodide |
Related compounds
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lanthanum(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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Lanthanum diiodide is an iodide of lanthanum, with the chemical formula of LaI2. It is an electride, actually having a chemical formula of La3+[(I−)2e−].[2]
Preparation
[edit]Lanthanum diiodide can be obtained from the reduction of lanthanum(III) iodide with lanthanum metal under a vacuum at 800 to 900 °C:[3]
- La + 2 LaI3 → LaI2
It can also be obtained by reacting lanthanum and mercury(II) iodide:[3]
- La + HgI2 → LaI2 + Hg
It was first created by John D. Corbett in 1961.[4]
Properties
[edit]Lanthanum diiodide is a blue-black solid with metallic lustre, which is easily hydrolyzed into the iodide oxide.[3] It has a MoSi2-type structure, with the space group I4/mmm (No. 139).[5]
References
[edit]- ^ a b c Holt Jr., Smith L. (1983). Inorganic syntheses. Volume 22. New York. p. 36. ISBN 978-0-470-13288-3. OCLC 86223480.
((cite book)): CS1 maint: location missing publisher (link) - ^ Holleman, Arnold F.; Walter de Gruyter GmbH & Co. KG (2017). Anorganische Chemie Band 2. Nebengruppenelemente, Lanthanoide, Actinoide, Transactinoide (in German). Berlin. p. 1789. ISBN 978-3-11-051854-2. OCLC 968134924.
((cite book)): CS1 maint: location missing publisher (link) - ^ a b c Brauer, Georg (1963). Handbook of Preparative Inorganic Chemistry V1. Burlington: Elsevier Science. p. 1081. ISBN 978-0-323-16127-5. OCLC 843200092.
- ^ 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.
- ^ Riedel, Erwin; Janiak, Christoph; Meyer, Hans-Jürgen (2012). Riedel, moderne anorganische Chemie (in German). Berlin: De Gruyter. p. 240. ISBN 978-3-11-024900-2. OCLC 781540844.
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