caesium superoxide

{{Chembox

| ImageFile = Kristallstruktur Bariumperoxid.png

| ImageCaption = {{legend|rgb(224,224,224)|Caesium cations, {{chem2|Cs+}}}}{{legend|red|Superoxide anions, {{chem2|O2−}}}}

|Section1={{Chembox Identifiers

| CASNo = 12018-61-0

| CASNo_Ref = {{cascite|correct|CAS}}

| PubChem =

| ChemSpiderID =

| InChI=1S/Cs.HO2/c;1-2/h;1H/q+1;/p-1

| InChIKey=DZWLBLJPRRQKGB-UHFFFAOYSA-M

| SMILES =[Cs+].[O-] [O]

}}

| Section2={{Chembox Properties

| Appearance = Yellow to orange solid

| Cs=1|O=2

| Density = 3.77 g/cm3[http://www.webelements.com/compounds/caesium/caesium_superoxide.html Caesiumhyperoxid bei webelements.com.]

| MeltingPt = 600 °C{{cite book | last=Holleman | first=Arnold | title=Lehrbuch der anorganischen Chemie | publisher=de Gruyter | publication-place=BerlinNew York | year=2007 | isbn=978-3-11-017770-1 | oclc=180963521 | language=de}}

| BoilingPt =

| Solubility = reacts

}}

|Section8={{Chembox Related

| OtherCations={{ubl|Lithium superoxide|Sodium superoxide|Potassium superoxide|Rubidium superoxide}}

| OtherAnions={{ubl|Caesium oxide|Caesium peroxide}}

}}

}}

Caesium superoxide is a chemical compound with the chemical formula {{chem2|CsO2}}. It consists of caesium cations {{chem2|Cs+}} and superoxide anions {{chem2|O2−}}. It is an orange solid.

Preparation

Burning caesium in excess oxygen will produce caesium superoxide.

:{{chem2|Cs + O2 → CsO2}}

Properties

Caesium superoxide's crystal structure is same as calcium carbide. It contains direct oxygen-oxygen bonding.

It reacts with water to form hydrogen peroxide and caesium hydroxide.

:{{chem2|2 CsO2 + 2 H2O → O2↑ + H2O2 + 2 CsOH}}

Heating to approximately 400 °C induces thermal decomposition to caesium peroxide.{{cite journal | last1=Berardinelli | first1=S. P. | last2=Kraus | first2=D. L. | title=Thermal decomposition of the higher oxides of cesium in the temperature range 320-500.deg. | journal=Inorganic Chemistry | publisher=American Chemical Society (ACS) | volume=13 | issue=1 | date=1974-01-01 | issn=0020-1669 | doi=10.1021/ic50131a037 | pages=189–191}}

The standard enthalpy of formation ΔHf0 of caesium superoxide is −295 kJ/mol.{{cite book | last=Holleman | first=Arnold | title=Anorganische ChemienBand 1 | publisher=de Gruyter | publication-place=Berlin | year=2017 | isbn=978-3-11-049585-0 | oclc=968134975 | language=de}}

Caesium superoxide reacts with ozone to form caesium ozonide.

:{{chem2|CsO2 + O3 → CsO3 + O2}}

References

{{reflist}}

{{caesium compounds}}

{{oxides}}

Category:Caesium compounds

Category:Superoxides