Percobaltates are chemical compounds where the oxidation state of

cobalt Cobalt is a chemical element with the symbol Co and atomic number 27. As with nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, pro ...

is +5. This is the highest established oxidation state of cobalt. The simplest of these are bi-metallic

Group 1 Group 1 may refer to: * Alkali metal, a chemical element classification for Alkali metal * Group 1 (racing) The Group 1 racing class referred to FIA regulations for cars in touring car racing and rallying. Throughout its existence the group reta ...

oxides such as sodium percobaltate (Na₃CoO₄); which may be produced by the reaction of

cobalt(II,III) oxide Cobalt(II,III) oxide is an inorganic compound with the formula Co3O4. It is one of two well characterized cobalt oxides. It is a black antiferromagnetic solid. As a mixed valence compound, its formula is sometimes written as CoIICoIII2O4 and som ...

and

sodium oxide Sodium oxide is a chemical compound with the formula Na2 O. It is used in ceramics and glasses. It is a white solid but the compound is rarely encountered. Instead "sodium oxide" is used to describe components of various materials such as gla ...

, 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 or

fluorides Fluoride (). According to this source, is a possible pronunciation in British English. is an inorganic, monatomic anion of fluorine, with the chemical formula (also written ), whose salts are typically white or colorless. Fluoride salts typi ...

. A number of organometallic Co(V) complexes have also been reported.

References

Salts Cobalt compounds Oxometallates {{Inorganic-compound-stub

See also

References