Ferrate

Ferrate loosely refers to a material that can be viewed as containing anionic iron complexes. The term ferrate derives .

Examples include tetrachloroferrate ([FeCl₄]^{2−}), oxyanions (e.g. ), and the organoferrates, including highly reduced tetracarbonylferrate ([Fe(CO)₄]^{2−}) salts. Although rarely studied, ferrate(V) [FeO₄]^{3−} and ferrate(IV) [FeO₄]^{4−} oxyanions of iron also exist. These too are called ferrates.

Ferrate(VI) is a strong oxidizer, used in water purification and battery technology.

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