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 | |||||||
|
|||||||
properties | |||||||
Molar mass | 164.9 g mol −1 | ||||||
Physical state |
firmly |
||||||
density |
3.77 g cm −3 |
||||||
Melting point |
600 ° C |
||||||
safety instructions | |||||||
|
|||||||
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 .
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 .
The standard enthalpy of formation of cesium hyperoxide is ΔH f 0 = −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 .
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 ).