Caesium superoxide

Caesium superoxide is the superoxide of caesium. It is an orange solid.

Caesium superoxide
Identifiers
3D model (JSmol)
  • InChI=1S/Cs.HO2/c;1-2/h;1H/q+1;/p-1
    Key: DZWLBLJPRRQKGB-UHFFFAOYSA-M
  • [Cs+].[O-] [O]
Properties
CsO2
Molar mass 164.903 g·mol−1
Appearance yellow to orange solid [1]
Density 3.77 g·cm−3[1]
Melting point 600 °C[2]
reacts
Related compounds
Other anions
 caesium oxide
caesium peroxide
Other cations
 lithium superoxide
sodium superoxide
potassium superoxide
rubidium superoxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Preparation

Burning caesium in excess oxygen will produce caesium superoxide.[2]

Cs + O2 → CsO2

Properties

Caesium superoxide's crystal structure is same as calcium carbide. It contains direct oxygen-oxygen bonding.[2]

It reacts with water to form hydrogen peroxide and caesium hydroxide.[2]

2 CsO2 + 2H2O → O2↑ + H2O2 + 2 CsOH

Heating to approximately 400 °C induces thermal decomposition to caesium peroxide.[3]

The standard enthalpy of formation ΔHf0 of caesium superoxide is −295 kJ/mol.[4]

Caesium superoxide reacts with ozone to form caesium ozonide.[2]

CsO2 + O3 → CsO3 + O2

References
  1. Caesiumhyperoxid bei webelements.com.
  2. Holleman, Arnold (2007). Lehrbuch der anorganischen Chemie (in German). BerlinNew York: de Gruyter. ISBN 978-3-11-017770-1. OCLC 180963521.
  3. Berardinelli, S. P.; Kraus, D. L. (1974-01-01). "Thermal decomposition of the higher oxides of cesium in the temperature range 320-500.deg". Inorganic Chemistry. American Chemical Society (ACS). 13 (1): 189–191. doi:10.1021/ic50131a037. ISSN 0020-1669.
  4. Holleman, Arnold (2017). Anorganische ChemienBand 1 (in German). Berlin: de Gruyter. ISBN 978-3-11-049585-0. OCLC 968134975.


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