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Iridium Tribromide
Iridium(III) bromide is a bromide of iridium(III), with the chemical formula of IrBr3. Preparation Iridium(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. It can also be formed by the direct reaction of iridium and bromine at 8 atm and 570 °C. Properties 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. 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. The light olive green tetrahydrate is slightly soluble in water but insoluble in ethanol and eth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iridium(II) Bromide
Iridium is a chemical element; it has the Symbol (chemistry), symbol Ir and atomic number 77. This very hard, brittle, silvery-white transition metal of the platinum group, is considered the second-densest naturally occurring metal (after osmium) with a density of as defined by experimental X-ray crystallography. 191Ir and 193Ir are the only two naturally occurring isotopes of iridium, as well as the only stable isotopes; the latter is the more abundant. It is one of the most corrosion-resistant metals, even at temperatures as high as . Iridium was discovered in 1803 in the acid-insoluble residues of platinum ores by the English chemist Smithson Tennant. The name ''iridium'', derived from the Greek word ''iris'' (rainbow), refers to the various colors of its compounds. Iridium is Abundance of elements in Earth's crust, one of the rarest elements in Crust (geology)#Earth's crust, Earth's crust, with an estimated annual production of only in 2023. The dominant uses of iridium ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
