Ammonium ferric citrate(Redirected from Ferric ammonium citrate)
Ammonium ferric citrate has the formula (NH4)5[Fe(C6H4O7)2]. A distinguishing feature of this compound is that it is very soluble in water, in contrast to ferric citrate which is not very soluble.
Crystal structure of (NH4)5[Fe(C6H4O7)2]·2H2O
2-Hydroxypropane-1,2,3-tricarboxylate, ammonium iron(3+) salt
Ferric ammonium citrate
Ammonium iron(III) citrate
Ammonium ferric citrate
Iron ammonium citrate
|E number||E381 (antioxidants, ...)|
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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In its crystal structure each citric acid moiety has lost four protons, and the deprotonated hydroxyl groups act as ligands together with four carboxylate groups; two carboxylate groups are not coordinated to the ferric ion.
Ammonium ferric citrate has a range of uses, including:
- As a food additive, where it has the E number E381, and is used as an acidity regulator. Most notably used in the Scottish beverage Irn Bru.
- Water purification
- As a reducing agent of metal salts of low activity like gold and silver.
- With potassium ferricyanide as part of the cyanotype photographic process.
- Used in Kligler iron deeps to determine hydrogen sulfide production in microbial metabolism.
- In medical imaging, ammonium ferric citrate is used as a contrast medium.
- As a hematinic.
- Matzapetakis, M.; Raptopoulou, C. P.; Tsohos, A.; Papaefthymiou, V.; Moon, N.; Salifoglou, A. (1998). "Synthesis, Spectroscopic and Structural Characterization of the First Mononuclear, Water Soluble Iron−Citrate Complex, (NH4)5Fe(C6H4O7)2·2H2O". J. Am. Chem. Soc. 120 (50): 13266–13267. doi:10.1021/ja9807035.
- Budavari, Susan, ed. (2001), The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals (13th ed.), Merck, ISBN 0911910131