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Thorium diiodide

From Wikipedia, the free encyclopedia
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 mass612.75
Appearancegolden metallic
Density7.21 g/cm3[1]
Melting point850 °C[2]
soluble
Structure
hexagonal
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
Radioactive
Related compounds
Othercations
Cerium diiodide
Praseodymium diiodide
Gadolinium diiodide
Related compounds
Thorium triiodide
Thorium tetraiodide
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa).
Chemical compound

Thorium diiodide is aniodide ofthorium, with the chemical formula of ThI2. It is anelectride with the ionic formula Th4+(I−)2e−2. It is air-sensitive.[3]

Preparation

[edit]

Thorium diiodide cn be prepared by heatingthorium tetraiodide instoichiometric 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 ofthorium triiodide at temperatures above 550 °C:[4]

2 ThI3 → ThI4 + ThI2

Properties

[edit]

Like the diiodides ofcerium,praseodymium andgadolinium, it has a metallic gold lustre and high electrical conductivity.[3]

References

[edit]
  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. ^abcGreenwood, Norman N.; Earnshaw, Alan (1997).Chemistry of the Elements (2nd ed.).Butterworth-Heinemann. p. 1272.ISBN 978-0-08-037941-8.
  4. ^abcHandbuch der präparativen anorganischen Chemie. 1 (3., umgearb. Aufl ed.). Stuttgart: Enke. 1975.ISBN 978-3-432-02328-1.
Th(II)
Th(III)
Th(IV)
Salts and covalent derivatives of theiodide ion
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