Lanthanum diiodide
Chemical compound
From Wikipedia, the free encyclopedia
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]
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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 |
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).
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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]