Lanthanum diiodide

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]

Lanthanum diiodide
Identifiers
3D model (JSmol)
  • InChI=1S/La.2HI/h;2*1H/q+2;;/p-2
    Key: UYZZZMCZZNTWGP-UHFFFAOYSA-L
  • [I-].[I-].[La+2]
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
 cerium diiodide
praseodymium diiodide
Related compounds
 lanthanum(III) iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Preparation

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

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
  1. 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)
  2. 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)
  3. Brauer, Georg (1963). Handbook of Preparative Inorganic Chemistry V1. Burlington: Elsevier Science. p. 1081. ISBN 978-0-323-16127-5. OCLC 843200092.
  4. 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. Springer Science and Business Media LLC. 97 (1): 25–34. Bibcode:1995ZPhyB..97...25J. doi:10.1007/bf01317584. ISSN 0722-3277. S2CID 124057481.
  5. 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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