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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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
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Radioactive |
| Related compounds | |
Other cations
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Cerium diiodide Praseodymium diiodide Gadolinium diiodide |
Related compounds
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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
editThorium 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
editLike the diiodides of cerium, praseodymium and gadolinium, it has a metallic gold lustre and high electrical conductivity.[3]
References
edit- ^ Guggenberger, Lloyd J.; Jacobson, R. A. (November 1968). "Crystal structure of thorium diiodide". Inorganic Chemistry. 7 (11): 2257–2260. doi:10.1021/ic50069a017. ISSN 0020-1669.
- ^ Edelstein, Norman M.; Fuger, J.; Morss, Lester R. (2010). The chemistry of the actinide and transactinide elements (4th ed.). Dordrecht: Springer. ISBN 978-94-007-0211-0.
- ^ a b c Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 1272. ISBN 978-0-08-037941-8.
- ^ a b c Handbuch der präparativen anorganischen Chemie. 1 (3., umgearb. Aufl ed.). Stuttgart: Enke. 1975. ISBN 978-3-432-02328-1.