Ferrate

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

Examples include tetrachloroferrate ([FeCl₄]²⁻), oxyanions (e.g. FeO²⁻
₄), 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.

• Ferrates
• Disodium salt of tetracarbonylferrate
• Structure of ferrate(VI), [FeO₄]²⁻
• 1-Butyl-3-methylimidazolium salt of [FeCl₄]⁻
• Potassium tris(oxalato)ferrate

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