Caesium superoxide

  Caesium cations, Cs+
  Superoxide anions, O−2
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/cm3[1]
Melting point 600 °C[2]
reacts
Related compounds
Other anions
Other cations
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Caesium superoxide is a chemical compound with the chemical formula CsO2. It consists of caesium cations Cs+ and superoxide anions O−2. It is an orange solid.

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 + 2 H2O → 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. ^ a b Caesiumhyperoxid bei webelements.com.
  2. ^ a b c d e 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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