Uranium(III) iodide
Chemical compound
From Wikipedia, the free encyclopedia
Uranium triiodide is an inorganic compound with the chemical formula UI3. It is a black solid that is soluble in water.
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| Identifiers | |
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3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.033.992 |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| UI3 | |
| Molar mass | 618.74232 g/mol |
| Appearance | black solid |
| Density | 6.78 g/cm3[1] |
| Melting point | 766[2] °C (1,411 °F; 1,039 K) |
| Structure | |
| orthorhombic | |
| Ccmm, No. 63 | |
a = 432.8 pm, b = 1401.1 pm, c = 1000.5 pm | |
Formula units (Z) |
4 |
| Hazards | |
| GHS labelling: | |
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| Danger | |
| H300, H330, H373, H411 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Production
Uranium triiodide can be obtained from the direct reaction of its constituent elements:[3]
- 2 U + 3 I2 → 2 UI3
When the reaction is conducted in tetrahydrofuran (THF), the product is the blue complex UI3(THF)4.[4]
Properties
It crystallizes in the orthorhombic crystal system (plutonium tribromide-type) in the space group Ccmm with the lattice parameters a = 432.8 pm, b = 1401.1 pm, and c = 1000.5 pm and four formula units per unit cell.[1]
Uranium triiodide can be used as a Lewis acid catalyst for various Diels-Alder reactions carried out under mild conditions.[5]