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3D model (JSmol)
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PubChem CID
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RbI3 | |
Appearance | black crystals |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Rubidium triiodide is an inorganic compound with the chemical formula RbI3. It is composed of Rb+ and I−
3.
Rubidium triiodide can be obtained by heating rubidium iodide and iodine in aqueous solution:[1]
Rubidium triiodide is an orthorhombic black crystal, isomorphic to caesium triiodide, with space group Pnma, unit cell parameters a = 1090.8 pm, b = 665.5 pm, c = 971.1 pm.[2] Upon heating to 270 °C, the rubidium triiodide decomposes into rubidium iodide and elemental iodine.[1] It is soluble in ethanol and decomposes in ether.[1]
It has long been believed that rubidium triiodide reacts further with iodine to form RbI7 and RbI9,[3] but this has been refuted by recent studies.[4][2]