Caesium sesquioxide

Caesium sesquioxide
Identifiers
3D model (JSmol)	Interactive image;
PubChem CID	157422808;
	InChI InChI=1S/4Cs.2HO2.O2/c;;;;31-2/h;;;;21H;/q4*+1;;;-2/p-2 Key: CBAPCGFDLAJQPQ-UHFFFAOYSA-L;
	SMILES [Cs+].[Cs+].[Cs+].[Cs+].[O-][O].[O-][O].[O-][O-];
Properties
Chemical formula	Cs4O6
Molar mass	627.616 g·mol−1
Appearance	black powder
Structure
Crystal structure	Pu2C3 structure type (body-centered cubic)
Space group	I43d (no. 220)
Lattice constant	a = 984.6 pm
Related compounds
Other cations	Rubidium sesquioxide
Related caesium oxides	Caesium suboxides; Caesium monoxide; Caesium peroxide; Caesium superoxide; Caesium ozonide;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Caesium sesquioxide is a chemical compound with the formula Cs₂O₃ or more accurately Cs₄O₆. It is an oxide of caesium containing oxygen in different oxidation states. It consists of caesium cations Cs⁺, superoxide anions O−2 and peroxide anions O2−2. Caesium in this compound has an oxidation state of +1, while oxygen in superoxide has an oxidation state of −1/2 and oxygen in peroxide has an oxidation state of −1. This compound has a structural formula of (Cs⁺)₄(O−2)₂(O2−2). Compared to the other caesium oxides, this phase is less well studied, but has been long present in the literature.