 | |
| Names | |
|---|---|
| Other names Thorium tetraiodide | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.029.283 |
| EC Number |
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| UNII | |
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| Properties[1] | |
| ThI4 | |
| Molar mass | 739.656 g/mol |
| Appearance | white-yellow crystals |
| Density | 6 g/cm3, solid |
| Melting point | 570 °C (1,058 °F; 843 K) |
| Boiling point | 837 °C (1,539 °F; 1,110 K) |
| Structure | |
| monoclinic | |
| 8 coordinate square antiprismatic | |
| Thermochemistry | |
Std enthalpy of formation(ΔfH⦵298) | 83 J/g |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Thorium(IV) iodide is aninorganicchemical compound composed ofthorium andiodine with the chemical formulaThI4. It is one of three known thorium iodides, the others beingThI3 andThI2.
Thorium(IV) iodide can be made by reactingthorium(IV) carbide or elemental thorium withiodine at 500 °C.[2]
It can also be made from the reaction of Thorium(IV) hydride withhydrogen iodide.[3]
Thorium(IV) iodide is an extremely air and moisture sensitive solid which exists in the form of crystal platelets that are orange when heated and yellow in the cold. It has amonoclinic crystal structure with the space group P21/n (space group no. 14, position 2) and the lattice parameters a = 1321.6 pm, b = 806.8 pm, c = 776.6 pm, β = 98.68°.[2] It can also form a decahydrate. It forms complexes withLewis bases. It reacts with thorium to formthorium(III) iodide andthorium(II) iodide.[4]
Thorium(IV) iodide is used as an intermediate for the production of high-purity thorium by thermal decomposition of the compound (seeVan Arkel-de Boer process)[3]
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