Percobaltates are chemical compounds where the
oxidation state
In chemistry, the oxidation state, or oxidation number, is the hypothetical Electrical charge, charge of an atom if all of its Chemical bond, bonds to other atoms are fully Ionic bond, ionic. It describes the degree of oxidation (loss of electrons ...
of
cobalt
Cobalt is a chemical element; it has Symbol (chemistry), 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. ...
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 (motorsport), a regulation set of the FIA for series-production touring cars used in motorsport.
* Group One Thoroughbred horse races, the leading e ...
oxides such as sodium percobaltate (Na
3CoO
4); which may be produced by the reaction of
cobalt(II,III) oxide
Cobalt is a chemical element; it has 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, ...
and
sodium oxide
Sodium oxide is a chemical compound with the formula . 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 glasses and f ...
, using oxygen as the oxidant:
: 4 Co
3O
4 + 18 Na
2O + 7 O
2 → 12 Na
3CoO
4
The
potassium
Potassium is a chemical element; it has Symbol (chemistry), symbol K (from Neo-Latin ) and atomic number19. It is a silvery white metal that is soft enough to easily cut with a knife. Potassium metal reacts rapidly with atmospheric oxygen to ...
salt can be synthesized similarly; its
magnetic moment
In electromagnetism, the magnetic moment or magnetic dipole moment is the combination of strength and orientation of a magnet or other object or system that exerts a magnetic field. The magnetic dipole moment of an object determines the magnitude ...
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 containing at least one oxygen atom and one other element in its chemical formula. "Oxide" itself is the dianion (anion bearing a net charge of −2) of oxygen, an O2− ion with oxygen in the oxidation state o ...
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.
See also
*
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 lattic ...
References
Salts
Cobalt compounds
Transition metal oxyanions
Oxometallates
{{Inorganic-compound-stub