Ferrate

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

Examples include tetrachloroferrate ([FeCl4]2−), oxyanions (e.g. FeO2−4), and the organoferrates, including highly reduced tetracarbonylferrate ([Fe(CO)4]2−) salts.[1] Although rarely studied, ferrate(V) [FeO4]3− and ferrate(IV) [FeO4]4− oxyanions of iron also exist. These too are called ferrates.[2]

* 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,[3] used in water purification[4] and battery technology.[5][6]

## References

1. ↑ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
2. ↑ Graham Hill; John Holman (2000). Chemistry in context (5th ed.). Nelson Thornes. p. 202. ISBN 0-17-448276-0.
3. ↑ Sharma, Virender K. (2002-03-01). "Potassium ferrate(VI): an environmentally friendly oxidant". Advances in Environmental Research 6 (2): 143–156. doi:10.1016/S1093-0191(01)00119-8. ISSN 1093-0191. Bibcode: 2002AdvER...6..143S. https://www.sciencedirect.com/science/article/pii/S1093019101001198.
4. ↑ Licht, Stuart; Yu, Xingwen (2005-10-01). "Electrochemical Alkaline Fe(VI) Water Purification and Remediation" (in en). Environmental Science & Technology 39 (20): 8071–8076. doi:10.1021/es051084k. ISSN 0013-936X. PMID 16295877. Bibcode: 2005EnST...39.8071L. https://pubs.acs.org/doi/10.1021/es051084k.
5. ↑ Licht, Stuart; Wang, Baohui; Ghosh, Susanta (1999-08-13). "Energetic Iron(VI) Chemistry: The Super-Iron Battery" (in en). Science 285 (5430): 1039–1042. doi:10.1126/science.285.5430.1039. ISSN 0036-8075. PMID 10446044. https://www.science.org/doi/10.1126/science.285.5430.1039.
6. ↑ Licht, Stuart; Naschitz, Vera; Halperin, Leonid; Halperin, Nadezhda; Lin, Lin; Chen, Jianjun; Ghosh, Susanta; Liu, Bing (2001-10-15). "Analysis of ferrate(VI) compounds and super-iron Fe(VI) battery cathodes: FTIR, ICP, titrimetric, XRD, UV/VIS, and electrochemical characterization". Journal of Power Sources 101 (2): 167–176. doi:10.1016/S0378-7753(01)00786-8. ISSN 0378-7753. Bibcode: 2001JPS...101..167L. https://www.sciencedirect.com/science/article/pii/S0378775301007868.

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