Cobalt(II) phosphate

Cobalt phosphate is the inorganic compound with the formula Co3(PO4)2.

[2] Thin films of this material are water oxidation catalysts.

[3] The tetrahydrate Co3(PO4)2•4H2O precipitates as a solid upon mixing aqueous solutions of cobalt(II) and phosphate salts.

According to X-ray crystallography, the anhydrous Co3(PO4)2 consists of discrete phosphate (PO3−4) anions that link Co2+ centres.

The cobalt ions occupy both octahedral (six-coordinate) and pentacoordinate sites in a 1:2 ratio.

A swatch of cobalt violet, popular among the French impressionists .