 Crystal structure | |
| Identifiers | |
|---|---|
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3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.030.146 |
| EC Number |
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| Properties | |
| Br3Ir | |
| Molar mass | 431.929 g·mol−1 |
| Appearance | dark reddish-brown solid[1] |
| Density | 6.82 g·cm−3[2] |
| insoluble[1] | |
| Solubility | insoluble in acids and bases[1] |
| Related compounds | |
Otheranions | Iridium(III) hydroxide Iridium(III) chloride Iridium(III) iodide |
Othercations | Ruthenium(III) bromide Rhodium(III) bromide Osmium(III) bromide Platinum(III) bromide |
Related compounds | Iridium(II) bromide |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Iridium(III) bromide is abromide ofiridium(III), with the chemical formula of IrBr3.
Iridium(III) bromide can be formed by reactingiridium(II) bromide andbromine. Its tetrahydrate can be formed by reactingiridium dioxide dihydrate withhydrobromic acid.[1] It can also be formed by the direct reaction of iridium and bromine at 8 atm and 570 °C.[3]
Iridium(III) bromide is a dark reddish-brown solid that is insoluble soluble in water, acids, and alkalis and decomposes to iridium(II) bromide on heating.[1] It crystallizes in a highly disordered layered structure ofaluminum(III) chloride orchromium(III) chloride type, where themonoclinicunit cell contains fourformula units. As withrhenium(III) chloride,rhenium(III) bromide, α-iridium(III) chloride and α-ruthenium(III) chloride, the disorder is due to the different stacking of the metal layers.[4] The light olive green tetrahydrate is slightly soluble in water but insoluble inethanol andether. When heated to 100 °C, it turns dark brown with release ofwater and decomposes toiridium andbromine at higher temperatures.[1] It reacts withgermanium dibromide inhydrobromic acid solution to form a compound containing Ir-Ge bond, and adding Cs+ to it can separate Cs3[Ir(GeBr3)nBr6−n] (n=1, 2, 3).[5]
