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Chemical compound
Rubidium triiodide is an inorganic compound with the chemical formula RbI3. It is composed of Rb+ and I3-.
Preparation.
Rubidium triiodide can be obtained by heating rubidium iodide and iodine in aqueous solution:
 RbI + I2 → RbI3
Properties.
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. Upon heating to 270 °C, the rubidium triiodide decomposes into rubidium iodide and elemental iodine. It is soluble in ethanol and decomposes in ether.
Reactions.
It has long been believed that rubidium triiodide reacts further with iodine to form RbI7 and RbI9, but this has been refuted by recent studies.
References.
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