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]

Thorium diiodide
Identifiers
3D model (JSmol)
  • InChI=1S/2HI.Th/h2*1H;/q;;+2/p-2
    Key: WASWCTHKYRRDNN-UHFFFAOYSA-L
  • [Th+2].[I-].[I-]
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).

Preparation

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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

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Like the diiodides of cerium, praseodymium and gadolinium, it has a metallic gold lustre and high electrical conductivity.[3]

References

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  1. ^ 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.
  2. ^ 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.
  3. ^ 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.
  4. ^ a b c Handbuch der präparativen anorganischen Chemie. 1 (3., umgearb. Aufl ed.). Stuttgart: Enke. 1975. ISBN 978-3-432-02328-1.