Caesium ozonide (CsO₃) is an oxygen-rich compound of

caesium Caesium (IUPAC spelling) (or cesium in American English) is a chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal with a melting point of , which makes it one of only five elemental metals that a ...

. It is an

ozonide Ozonide is the polyatomic anion . Cyclic organic compounds formed by the addition of ozone () to an alkene are also called ozonides. Ionic ozonides Inorganic ozonides are dark red salts. The anion has the bent shape of the ozone molecule. Ino ...

, meaning it contains the ozonide anion (O₃⁻). It can be formed by reacting

ozone Ozone (), or trioxygen, is an inorganic molecule with the chemical formula . It is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope , breaking down in the lo ...

with

caesium superoxide Caesium superoxide is the superoxide of caesium. It is an orange solid. Preparation Burning caesium in excess oxygen will produce caesium superoxide. : Properties Caesium superoxide's crystal structure is same as calcium carbide. It contains ...

: :CsO2 + O3 -> CsO3 + O2 The compound will react strongly with any water in the air forming

caesium hydroxide Caesium hydroxide is a strong base (pKa= 15.76) containing the highly reactive alkali metal caesium, much like the other alkali metal hydroxides such as sodium hydroxide and potassium hydroxide. Caesium hydroxide is corrosive enough to quickly ...

. :2 CsO3 + H2O -> 2CsOH + 5/2O2 If heated to between 70 and 100 °C, caesium ozonide will quickly decompose to

(CsO₂). In fact, the compound is metastable to decomposition into

, slowly decomposing at room temperature, but can remain intact for months if stored at -20 °C. Above around 8 °C, the crystal structure is of the

caesium chloride Caesium chloride or cesium chloride is the inorganic compound with the formula Cs Cl. This colorless salt is an important source of caesium ions in a variety of niche applications. Its crystal structure forms a major structural type where each ...

type, with the ozonide in place of the chloride ion. At lower temperatures, the crystal structure changes to a structure identical to

rubidium ozonide Rubidium ozonide is an oxygen rich compound of rubidium. It is an ozonide, meaning it contains the ozonide anion (O3−). It can be created by reacting rubidium superoxide (RbO2) with ozone (O3) in a liquid ammonia Ammonia is an inorganic ...

(RbO₃), with

space group In mathematics, physics and chemistry, a space group is the symmetry group of an object in space, usually in three dimensions. The elements of a space group (its symmetry operations) are the rigid transformations of an object that leave it unchan ...

P2₁/c.

References

Caesium compounds Ozonides {{inorganic-compound-stub