Thorium triiodide

Last updated
Thorium triiodide
Unit cell of beta-ThI3.png
Identifiers
3D model (JSmol)
PubChem CID
  • InChI=1S/3HI.Th/h3*1H;/q;;;+3/p-3
    Key: DSHBAXKNFMWFAR-UHFFFAOYSA-K
  • [Th+3].[I-].[I-].[I-]
Properties
I3Th
Molar mass 612.7511 g·mol−1
Appearancecrystals
reacts with water
Related compounds
Related compounds
 Americium triiodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Thorium triiodide is a binary inorganic compound of thorium metal and iodine with the chemical formula ThI3. [1] [2] [3]

Contents

Synthesis

Th metal is heated with ThI4 in a vacuum at 800 °C. [4]

Th + 3ThI4 → 4ThI3

Physical properties

Thorium triiodide is a black, violet-tinged, usually poorly crystallized mass. Formed crystals exhibit strong dichroism from violet to olive green under the microscope and are birefringent. [5] Above 550 °C, thorium(III) iodide decomposes to thorium(IV) iodide and thorium(II) iodide. β-thorium(III) iodide has an orthorhombic crystal structure with the space group Cccm (space group no. 66). [6] The α-form has a pseudoorthorhombic crystal structure.

Chemical properties

ThI3 reacts with water to form thorium tetraiodide and thorium metal. [4]

References

  1. ↑ Yaws, Carl L. (6 January 2015). The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals: Physical Properties for More Than 54,000 Organic and Inorganic Chemical Compounds, Coverage for C1 to C100 Organics and Ac to Zr Inorganics. Gulf Professional Publishing. p. 802. ISBN   978-0-12-801146-1 . Retrieved 3 April 2024.
  2. ↑ Brown, David; Canterford, J. H.; Colton, Ray (1968). Halides of the Transition Elements: Halides of the lanthanides and actinides, by D. Brown. Wiley. p. 229. ISBN   978-0-470-10840-6 . Retrieved 3 April 2024.
  3. ↑ Seaborg, Glenn T. (20 May 1994). Modern Alchemy: Selected Papers Of Glenn T Seaborg. World Scientific. p. 21. ISBN   978-981-4502-99-3 . Retrieved 3 April 2024.
  4. 1 2 David, Lore Rose (1953). Thorium: A Bibliography of Unclassified Literature. Technical Information Service. p. 18. Retrieved 3 April 2024.
  5. ↑ Brauer, Georg (1975). Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume 1. Stuttgart: Ferdinand Enke. p. 1142. ISBN   978-3-432-02328-1 . Retrieved 19 June 2025.
  6. ↑ Morss, Lester R.; Edelstein, Norman M.; Fuger, J. (2006). Morss, Lester R.; Edelstein, Norman M.; Fuger, Jean (eds.). The Chemistry of the Actinide and Transactinide Elements. Springer. p. 78. doi:10.1007/1-4020-3598-5. ISBN   978-94-007-0211-0 . Retrieved 19 June 2025.
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