Caesium superoxide
 Cs+ Superoxide anions, O−2 | |
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| Properties | |
Chemical formula | 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] |
Solubility in water | reacts |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references | |
Chemical compound
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
- ^ a b Caesiumhyperoxid bei webelements.com.
- ^ 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.
- ^ 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. 13 (1). American Chemical Society (ACS): 189–191. doi:10.1021/ic50131a037. ISSN 0020-1669.
- ^ Holleman, Arnold (2017). Anorganische ChemienBand 1 (in German). Berlin: de Gruyter. ISBN 978-3-11-049585-0. OCLC 968134975.
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