Iridium(III) bromide is a bromide of iridium(III), with the chemical formula of IrBr3.
 Crystal structure
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3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.030.146 |
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PubChem CID
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CompTox Dashboard (EPA)
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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] |
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Other anions
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Iridium(III) hydroxide Iridium(III) chloride Iridium(III) iodide |
Other cations
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Ruthenium(III) bromide Rhodium(III) bromide Osmium(III) bromide Platinum(III) bromide |
Related compounds
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Iridium(II) bromide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
editIridium(III) bromide can be formed by reacting iridium(II) bromide and bromine. Its tetrahydrate can be formed by reacting iridium dioxide dihydrate with hydrobromic acid.[1] It can also be formed by the direct reaction of iridium and bromine at 8 atm and 570 °C.[3]
Properties
editIridium(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 of aluminum(III) chloride or chromium(III) chloride type, where the monoclinic unit cell contains four formula units. As with rhenium(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 in ethanol and ether. When heated to 100 °C, it turns dark brown with release of water and decomposes to iridium and bromine at higher temperatures.[1] It reacts with germanium dibromide in hydrobromic 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]
References
edit- ^ a b c d e f Kandiner, H. J. (2013-09-03). Iridium (in German). Springer-Verlag. ISBN 978-3-662-12128-3.
- ^ Perry, Dale L. (2016-04-19). Handbook of Inorganic Compounds. CRC Press. ISBN 978-1-4398-1462-8.
- ^ Livingstone, Stanley E. (2017-01-31). The Chemistry of Ruthenium, Rhodium, Palladium, Osmium, Iridium and Platinum: Pergamon Texts in Inorganic Chemistry, Volume 25. Elsevier. ISBN 978-1-4831-5840-2.
- ^ Brodersen, K.; Thiele, G.; Ohnsorge, H.; Recke, I.; Moers, F. (1968-07-01). "Die struktur des IrBr3 und über die ursachen der fehlordnungserscheinungen bei den in schichtenstrukturen kristallisierenden edelmetalltrihalogeniden". Journal of the Less Common Metals (in German). 15 (3): 347–354. doi:10.1016/0022-5088(68)90194-X. ISSN 0022-5088.
- ^ Antonov, P. G.; Agapov, I. A.; Manasevich, D. S. Iridium(III) complexation with germanium(II) compounds in aqueous hydrobromic acid solutions (in Russian). Zhurnal Prikladnoi Khimii (Sankt-Peterburg), 1999. 72 (4): 556-559. ISSN: 0044-4618.