!!!! Ferrate

==== Wikipedia

https://en.wikipedia.org/wiki/Iron(III)_chloride @@ https://en.wikipedia.org/wiki/Iron(III)_chloride
https://en.wikipedia.org/wiki/Potassium_ferrate @@ https://en.wikipedia.org/wiki/Potassium_ferrate
https://en.wikipedia.org/wiki/Ferrate(VI) @@ https://en.wikipedia.org/wiki/Ferrate(VI)

==== References
https://pubs.acs.org/doi/10.1021/j100885a035 @@ whttps://pubs.acs.org/doi/10.1021/j100885a035
https://onlinelibrary.wiley.com/doi/pdf/10.1107/S0108270187093958 @@ https://onlinelibrary.wiley.com/doi/pdf/10.1107/S0108270187093958
https://www.researchgate.net/publication/231357338_Structure_of_tetramethylammonium_tetrachloroferrateII_NCH342FeCl4_Comparison_of_ironII_and_ironIII_bond_lengths_in_high-spin_tetrahedral_environments @@ https://www.researchgate.net/publication/231357338_Structure_of_tetramethylammonium_tetrachloroferrateII_NCH342FeCl4_Comparison_of_ironII_and_ironIII_bond_lengths_in_high-spin_tetrahedral_environments
https://www.sciencedirect.com/science/article/pii/002016939504955X @@ https://www.sciencedirect.com/science/article/pii/002016939504955X
https://www.tib.eu/en/search/id/acs%3Adoi~10.1021%252Fj100885a035/The-Crystal-Structure-of-Sodium-Tetrachloroferrate/ @@ https://www.tib.eu/en/search/id/acs%3Adoi~10.1021%252Fj100885a035/The-Crystal-Structure-of-Sodium-Tetrachloroferrate/
https://materialsproject.org/materials/mp-28435/ @@ https://materialsproject.org/materials/mp-28435/