Caesium oxalate (standard IUPAC spelling), or dicesium oxalate, or cesium oxalate (American spelling) is a chemical compound with the chemical formula . It is a caesium salt of oxalic acid. It consists of caesium cations and oxalate anions .
Caesium oxalate can be prepared by passing carbon monoxide and carbon dioxide over caesium carbonate at 380 ðC:
Other alkali carbonates do not undergo transformation to oxalate.
Caesium carbonate can react with oxalic acid in aqueous solution to give caesium oxalate.
Caesium oxalate can be reduced back into caesium carbonate and carbon monoxide by thermal decomposition.
Compounds that contain caesium and another element in addition to the oxalate anion are double salts of caesium and oxalate. The oxalate may form a complex with a metal that can make a salt with caesium.
Examples include:
Mixed anion compounds containing caesium, oxalate and another anion also exist, such as the uranyl sulfate above, and caesium bis(oxalato)borate (CsBOB) ().