Metallate

Metallate or metalate is the name given to any complex anion containing a metal ligated to several atoms or small groups.

Typically, the metal will be one of the transition elements and the ligand will be oxygen or another chalcogenide or a cyanide group (though others are known). The chalcogenide metallates are known as oxometallates, thiometallates, selenometallates and tellurometallates; the cyanide metallates are known as cyanometallates.

Oxometallates include permanganate (MnO⁻
₄), chromate (CrO²⁻
₄) and vanadate (VO⁻
₃ or VO³⁻
₄).

Thiometallates include tetrathiovanadate (VS³⁻
₄), tetrathiomolybdate (MoS²⁻
₄), tetrathiotungstate (WS²⁻
₄) and similar ions.[1]

Cyanometallates include ferricyanide and ferrocyanide.

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).

References

Diemann, E.; Müller, A. (1973). "Schwefel- und Selenverbindungen von Übergangsmetallen mit d⁰-Konfiguration" [Sulfur and selenium compounds of transition metals with d⁰ configurations]. Coordination Chemistry Reviews. 10 (1–2): 79–122. doi:10.1016/S0010-8545(00)80232-5.

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[1] Diemann, E.; Müller, A. (1973). "Schwefel- und Selenverbindungen von Übergangsmetallen mit d⁰-Konfiguration" [Sulfur and selenium compounds of transition metals with d⁰ configurations]. Coordination Chemistry Reviews. 10 (1–2): 79–122. doi:10.1016/S0010-8545(00)80232-5.