Rubidium hyperoxide

Structural formula
__ Rb +      __ O -
General
Surname	Rubidium hyperoxide
other names	Rubidium dioxide Rubidium Superoxide (Obsolete)
Molecular formula	RbO 2
Brief description	orange, crystalline solid
External identifiers / databases
CAS number 12137-25-6 Wikidata Q2171592
properties
Molar mass	117.47 g mol −1
Physical state	firmly
density	3.0 g cm −3
Melting point	412-432 ° C
solubility	violent decomposition in water
safety instructions
GHS hazard labeling no classification available
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Rubidium hyperoxide is a chemical compound between rubidium and oxygen from the group of oxides , more precisely the hyperoxides .

Extraction and presentation

Rubidium hyperoxide is formed when rubidium is burned in excess of oxygen.

${\displaystyle \mathrm {Rb+O_{2}\longrightarrow RbO_{2}} }$

properties

Rubidium hyperoxide is an orange solid and, like potassium and cesium hyperoxide, crystallizes in the calcium carbide structure. When heated in a hydrogen atmosphere, rubidium hydroxide , water and oxygen are formed; hydrogen peroxide is formed as an intermediate product .

${\displaystyle \mathrm {4\ RbO_{2}+4\ H_{2}\longrightarrow 4\ RbOH+2\ H_{2}O_{2}\longrightarrow 4\ RbOH+2\ H_{2}O+O_{2}} }$

The standard enthalpy of formation of rubidium hyperoxide is ΔH _f ⁰  = −288 kJ / mol.

literature

• DL Kraus, AW Petrocelli: The thermal decomposition of Rubidium superoxide ¹ . In: The Journal of Physical Chemistry . tape 66 , no. 7 , July 1, 1962, pp. 1225-1227 , doi : 10.1021 / j100813a003 .

Individual evidence

1. ↑ ^{a b c d} rubidium superoxide (web elements)
2. ↑ Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 957.
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.
4. ^ ^{A b} 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.
5. ^ Hugo Erdmann, Paul Köthner: Ueber Rubidiumdioxyd . In: Justus Liebig's Annals of Chemistry . tape 294 , no. 1 , 1897, p. 55-71 , doi : 10.1002 / jlac.18972940103 .
6. ↑ Summary of the work by Erdmann and Köthner in: J. Chem. Soc. 72, No. 2, 1897, p. 96 ( full text ).
7. ^ AF Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 1176.