metallate
{{Redirect|Metalate|the chemical reaction|Metalation}}
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.
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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 {{chem2|MnO4−}}, chromate {{chem2|CrO4(2−)}}, vanadate {{chem2|VO3−}} or {{chem2|VO4(3−)}} and tungstate {{chem2|WO4(2−)}}.
Thiometallates include tetrathiovanadate {{chem2|VS4(3−)}}, tetrathiomolybdate {{chem2|MoS4(2−)}}, tetrathiotungstate {{chem2|WS4(2−)}}and similar ions.{{cite journal|first1=E. |last1=Diemann |first2=A. |last2=Müller |title=Schwefel- und Selenverbindungen von Übergangsmetallen mit d0-Konfiguration |trans-title=Sulfur and selenium compounds of transition metals with d0 configurations |journal=Coordination Chemistry Reviews |date=1973 |volume=10 |issue=1–2 |page=79–122 |doi=10.1016/S0010-8545(00)80232-5}}
Cyanometallates include ferricyanide {{chem2|[Fe(CN)6](3−)}}, ferrocyanide {{chem2|[Fe(CN)6](4−)}} and dicyanoargentate(I) {{chem2|[Ag(CN)2]−}}.
Halogenometallates include tetrachloroaluminate {{chem2|[AlCl4]−}}, tetrachloronickelate(II) {{chem2|[NiCl4](2−)}} and hexafluoroplatinate(V) {{chem2|[PtCl6]−}}.
Others include tetranitratoaluminate {{chem2|[Al(NO3)4]−}} and tetrahydroxozincate {{chem2|[Zn(OH)4](2−)}}.
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).