Percobaltate

Chemical compounds

Percobaltates are chemical compounds where the oxidation state of cobalt is +5. This is the highest established oxidation state of cobalt.^[1] 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).^[2]^[3] No crystallographic analysis has been reported for either material. Percobaltates can be stabilized by use of oxides or fluorides.^{[citation needed]}

A number of organometallic Co(V) complexes have also been reported.^[1]

References

^ ^a ^b Riedel, Sebastian; Kaupp, Martin (March 2009). "The highest oxidation states of the transition metal elements". Coordination Chemistry Reviews. 253 (5–6): 606–624. doi:10.1016/j.ccr.2008.07.014.
^ Brendel, Claus; Klemm, Wilhelm (January 1963). "Weitere Versuche zur Darstellung von Kaliumcobaltat (V)". Zeitschrift für anorganische und allgemeine Chemie (in German). 320 (1–4): 59–63. doi:10.1002/zaac.19633200109.
^ D. Nicholls (2 October 2013). The Chemistry of Iron, Cobalt and Nickel: Comprehensive Inorganic Chemistry. Elsevier Science. pp. 1107–. ISBN 978-1-4831-4643-0.