Cesium hyperoxide

Crystal structure
	__ Cs + __ O -
General
Surname	Cesium hyperoxide
other names	Cesium superoxide (obsolete)
Ratio formula	CsO 2
Brief description	yellow to orange solid
External identifiers / databases
Wikidata	Q1025477
properties
Molar mass	164.9 g mol −1
Physical state	firmly
density	3.77 g cm −3
Melting point	600 ° C
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
Thermodynamic properties
ΔH f 0	−295 kJ / mol
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Caesiumhyperoxid (obsolete Caesiumsuperoxid) is a chemical compound of cesium and one of the hyperoxides , thus has O ₂^- as anion . It is an orange solid.

Extraction and presentation

Cesium hyperoxide is formed when cesium is burned in excess of oxygen .

{\ displaystyle {\ ce {Cs + O2 -> CsO2}}}

properties

Like potassium and rubidium hyperoxide, cesium hyperoxide crystallizes in the calcium carbide structure. In contrast to oxides , cesium hyperoxide has direct oxygen-oxygen bonds.

In water, cesium hyperoxide disproportionates to oxygen, hydrogen peroxide and cesium hydroxide .

{\ displaystyle {\ ce {2CsO2 + 2H2O -> O2 ^ + H2O2 + 2CsOH}}}

The standard enthalpy of formation of cesium hyperoxide is ΔH _f⁰ = −295 kJ / mol.

use

Cesium hyperoxide is a possible starting compound for the production of cesium ozonide . For this purpose, the hyperoxide is reacted with ozone .

{\ displaystyle {\ ce {CsO2 + O3 -> CsO3 + O2}}}

Individual evidence

↑ ^a ^b cesium hyperoxide at webelements.com.
↑ ^a ^b ^c ^d ^e A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , pp. 1285-1286.
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ ^a ^b A. F. Holleman , N. Wiberg : Inorganische Chemie . 103rd edition. Volume 1: Basics and main group elements. Walter de Gruyter, Berlin / Boston 2016, ISBN 978-3-11-049585-0 , p. 1515 (reading sample: Part A - Basics of the chemistry of hydrogen. Google book search ).

[webelements-1] sium hyperoxide at webelements.com.

[Howi-2] A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 102nd edition. Walter de Gruyter, Berlin 2007, ISBN 978-3-11-017770-1 , pp. 1285-1286.

[NV-3] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[wiberg1-4] A. F. Holleman , N. Wiberg : Inorganische Chemie . 103rd edition. Volume 1: Basics and main group elements. Walter de Gruyter, Berlin / Boston 2016, ISBN 978-3-11-049585-0 , p. 1515 (reading sample: Part A - Basics of the chemistry of hydrogen. Google book search ).