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Rubidium superoxide

Chemical compound From Wikipedia, the free encyclopedia

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Rubidium superoxide or rubidium hyperoxide is a chemical compound with the chemical formula RbO2. In terms of oxidation states, the negatively charged superoxide and positively charged rubidium give it a structural formula of Rb+[O2].[2]

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Chemistry

It can be created by slowly exposing elemental rubidium to oxygen gas:[3]

Rb(s) + O2(g) → RbO2(s)

Like other alkali metal hyperoxides, crystals can also be grown in liquid ammonia.[4]

Between 280 and 360 °C, Rubidium superoxide will decompose, leaving not rubidium sesquioxide (Rb2O3), but rather rubidium peroxide (Rb2O2).[3]

2 RbO2(s) → Rb2O2(s) + O2(g)

An even more oxygen rich compound, that of rubidium ozonide (RbO3) can be created using RbO2 and ozone.[5]

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Properties

Roughly speaking, RbO2 has a crystal structure similar to tetragonal calcium carbide, but is rather distorted due to the Jahn–Teller effect, which makes the crystal structure less symmetrical.[2]

RbO2 is stable in dry air, but is extremely hygroscopic.[3]

The compound has been studied as an example of magnetism arising intrinsically from the p-shell.[6] RbO2 has been predicted to be a paramagnetic Mott insulator.[7] At low temperatures, it transitions to antiferromagnetic order, with a Neel temperature of 15 K.[2]

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See also

References

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