Template:Redirect Metallate or metalate is the name given to any complex anion containing a metal ligated to two or more atoms and/or groups of atoms. Template:Sister project Typically, the metal is one of the transition elements and the ligand is oxygen or another chalcogenide, a cyanide group or a halogen (though others are known).
The chalcogenide metallates are known as oxometallates, thiometallates, selenometallates and tellurometallates; the cyanide metallates are known as cyanometallates; the halogenide metalates are known as halogenometallates.
Oxometallates include permanganate Template:Chem2, chromate Template:Chem2, vanadate Template:Chem2 or Template:Chem2 and tungstate Template:Chem2.
Thiometallates include tetrathiovanadate Template:Chem2, tetrathiomolybdate Template:Chem2, tetrathiotungstate Template:Chem2and similar ions.<ref>Template:Cite journal</ref>
Cyanometallates include ferricyanide Template:Chem2, ferrocyanide Template:Chem2 and dicyanoargentate(I) Template:Chem2.
Halogenometallates include tetrachloroaluminate Template:Chem2, tetrachloronickelate(II) Template:Chem2 and hexafluoroplatinate(V) Template:Chem2.
Others include tetranitratoaluminate Template:Chem2 and tetrahydroxozincate Template:Chem2.
Metallate is also used as a verb by bioinorganic chemistry to describe the act of adding metal atoms or ions to a site (synthetic ligand or protein).