 | |
| Identifiers | |
|---|---|
3D model (JSmol) | |
| ChemSpider | |
| |
| |
| Properties | |
| UBr5 | |
| Molar mass | 637.549 g/mol |
| Appearance | dark brown, hygroscopic crystalline solid |
| decomposes | |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Uranium pentabromide is aninorganicchemical compound with the formulaU2Br10.
The compound is made by reacting the elements in anacetonitrile solvent, or by reactingbromine withuranium metal oruranium tetrabromide at 55 °C (131 °F; 328 K).[1]
Uranium pentabromide is ahygroscopic dark brown solid that decomposes in water and most organic solvents, the exceptions beingacetonitrile ordichloromethane.[1] The compound is rather unstable and difficult to purify,[2] decomposing at 80 °C (176 °F; 353 K) intouranium tetrabromide and bromine.[3] The crystal structure is the same as that of β-UCl5, which is triclinic and consists ofU2Br10 dimers.[4]
Stable complexes of the formUBr5L are known with suchligands astriphenylphosphine oxide andhexamethylphosphoramide, and are obtained by brominatingUBr4 in the presence of the desired ligand.[2] In addition, it is possible to obtain a hexabromouranate(V) salt by reactingUBr5 with a monovalent bromide inthionyl bromide:[1]
