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Rubidium superoxide

From Wikipedia, the free encyclopedia
Rubidium superoxide
Names
Other names
Rubidium hyperoxide
Identifiers
3D model (JSmol)
  • InChI=1S/O2.Rb/c1-2;/q-1;+1
    Key: AFEOXRVICKHWAE-UHFFFAOYSA-N
  • O=[O-].[Rb+]
Properties
RbO2
Molar mass117.466 g·mol−1
AppearanceBright yellow[1]
Structure
DistortedCaC2 structure[2]
Related compounds
Othercations
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa).
Chemical compound

Rubidium superoxide orrubidium hyperoxide is achemical compound with thechemical formulaRbO2. In terms ofoxidation states, the negatively chargedsuperoxide and positively charged rubidium give it a structural formula ofRb+[O2]−.[2]

Chemistry

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It can be created by slowly exposing elementalrubidium tooxygen gas:[3]

Rb(s) + O2(g) → RbO2(s)

Like otheralkali metal hyperoxides, crystals can also be grown in liquidammonia.[4]

Between 280 and 360 °C, Rubidium superoxide willdecompose, leaving notrubidium sesquioxide (Rb2O3), but ratherrubidium peroxide (Rb2O2).[3]

2 RbO2(s) → Rb2O2(s) + O2(g)

An even more oxygen rich compound, that ofrubidium ozonide (RbO3) can be created usingRbO2 andozone.[5]

Properties

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

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

The compound has been studied as an example of magnetism arising intrinsically from thep-shell.[6]RbO2 has been predicted to be aparamagneticMott insulator.[7] At low temperatures, it transitions toantiferromagnetic order, with aNeel temperature of 15 K.[2]

See also

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References

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  1. ^Astuti, Fahmi; Miyajima, Mizuki; Fukuda, Takahito; Kodani, Masashi; Nakano, Takehito; Kambe, Takashi; Watanabe, Isao (2019). "Synthesis and Characterization of Magnetic Rubidium Superoxide, RbO2".Materials Science Forum.966. Trans Tech Publications, Ltd.:237–242.doi:10.4028/www.scientific.net/msf.966.237.ISSN 1662-9752.
  2. ^abcdLabhart, M.; Raoux, D.; Känzig, W.; Bösch, M. A. (1979-07-01). "Magnetic order in 2p-electron systems: Electron paramagnetic resonance and antiferromagnetic resonance in the alkali hyperoxides KO2, RbO2, and CsO2".Physical Review B.20 (1). American Physical Society (APS):53–70.Bibcode:1979PhRvB..20...53L.doi:10.1103/physrevb.20.53.ISSN 0163-1829.
  3. ^abcKraus, D. L.; Petrocelli, A. W. (1962). "The Thermal Decomposition of Rubidium Superoxide".The Journal of Physical Chemistry.66 (7). American Chemical Society (ACS):1225–1227.doi:10.1021/j100813a003.ISSN 0022-3654.
  4. ^Busch, G.; Strässler, S., eds. (1974). "Magnetische und kalorische Eigenschaften von Alkali-Hyperoxid-Kristallen".Physics of Condensed Matter. Berlin, Heidelberg: Springer Berlin Heidelberg. pp. 267–291.doi:10.1007/978-3-662-39595-0.ISBN 978-3-662-38713-9.
  5. ^Vol'nov, I. I.; Dobrolyubova, M. S.; Tsentsiper, A. B. (1966). "Synthesis of rubidium ozonide via rubidium superoxide".Bulletin of the Academy of Sciences, USSR Division of Chemical Science.15 (9). Springer Science and Business Media LLC: 1611.doi:10.1007/bf00848934.ISSN 0568-5230.
  6. ^Kováčik, Roman; Ederer, Claude (2009-10-26). "Correlation effects in p-electron magnets: Electronic structure of RbO2 from first principles".Physical Review B.80 (14) 140411. American Physical Society (APS).arXiv:0905.3721.Bibcode:2009PhRvB..80n0411K.doi:10.1103/physrevb.80.140411.ISSN 1098-0121.
  7. ^Kováčik, Roman; Werner, Philipp; Dymkowski, Krzysztof; Ederer, Claude (2012-08-17). "Rubidium superoxide: A p-electron Mott insulator".Physical Review B.86 (7) 075130. American Physical Society (APS).arXiv:1206.1423.Bibcode:2012PhRvB..86g5130K.doi:10.1103/physrevb.86.075130.ISSN 1098-0121.
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