Thorium diiodide
Chemical compound
From Wikipedia, the free encyclopedia
Thorium diiodide is an iodide of thorium, with the chemical formula of ThI2. It is an electride with the ionic formula Th4+(I−)2e−2. It is air-sensitive.[3]
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| Identifiers | |
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3D model (JSmol) |
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PubChem CID |
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| Properties | |
| ThI2 | |
| Molar mass | 612.75 |
| Appearance | golden metallic |
| Density | 7.21 g/cm3[1] |
| Melting point | 850 °C[2] |
| soluble | |
| Structure | |
| hexagonal | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards |
Radioactive |
| Related compounds | |
Other cations |
Cerium diiodide Praseodymium diiodide Gadolinium diiodide |
Related compounds |
Thorium triiodide Thorium tetraiodide |
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
Thorium diiodide cn be prepared by heating thorium tetraiodide in stoichiometric amounts of thorium:[3][4]
- ThI4 + Th → 2 ThI2
It can also be prepared by directly reacting thorium and iodine:[4]
- Th + I2 → ThI2
Thorium diiodide can also be prepared from the decomposition of thorium triiodide at temperatures above 550 °C:[4]
- 2 ThI3 → ThI4 + ThI2
Properties
Like the diiodides of cerium, praseodymium and gadolinium, it has a metallic gold lustre and high electrical conductivity.[3]