Ferrate

Ferrate loosely refers to a material that can be viewed as containing anionic iron complexes. Examples include tetrachloroferrate ([FeCl₄]²⁻), oxyanions (FeO²⁻
₄), tetracarbonylferrate ([Fe(CO)₄]²⁻), and the organoferrates.^{[1][page needed]} The term ferrate derives from Latin ferrum 'iron'. Some ferrates are called super-iron by some and have uses in battery applications and as an oxidizer.^[2][3][4] It can be used to clean water safely from a wide range of pollutants, including viruses, microbes, arsenic, sulfur-containing compounds, cyanides and other nitrogen-containing contaminants, many organic compounds, and algae.^[5]

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