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Percobaltates are chemical compounds where the oxidation state of cobalt is +5. This is the highest established oxidation state of cobalt. The simplest of these are bi-metallic Group 1 oxides such as sodium percobaltate (Na3CoO4); which may be produced by the reaction of cobalt(II,III) oxide and sodium oxide, using oxygen as the oxidant: : 4 Co3O4 + 18 Na2O + 7 O2 → 12 Na3CoO4 The potassium salt can be synthesized similarly; its magnetic moment has indicated the existence of cobalt(V). No crystallographic analysis has been reported for either material. Percobaltates can be stabilized by use of
oxides An oxide () is a chemical compound that contains at least one oxygen atom and one other element in its chemical formula. "Oxide" itself is the dianion of oxygen, an O2– (molecular) ion. with oxygen in the oxidation state of −2. Most of the E ...
or fluorides. A number of organometallic Co(V) complexes have also been reported.


See also

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Caesium hexafluorocobaltate(IV) Caesium hexafluorocobaltate(IV) is a salt with the chemical formula . It can be synthesized by the reaction of and fluorine. The salt contains rare example of cobalt(IV) complex, i.e. oF6sup>2-. It has cubic K2PtCl6 structure, with the lattice ...


References

Salts Cobalt compounds Oxometallates {{Inorganic-compound-stub