Ammonium ferric citrate

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Ammonium ferric citrate
Ammonium ferric citrate dihydrate structure.png
Crystal structure of (NH4)5[Fe(C6H4O7)2]·2H2O[1]
IUPAC name
2-Hydroxypropane-1,2,3-tricarboxylate, ammonium iron(3+) salt
Other names
Ferric ammonium citrate
ammonium iron(III) citrate
ammonium ferric citrate
iron ammonium citrate
ECHA InfoCard 100.013.351
E number E381 (antioxidants, ...)
Appearance yellow crystals
V08CA07 (WHO)
Safety data sheet [1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

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.

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.[1]


Ammonium ferric citrate has a range of uses, including:

See also[edit]


  1. ^ a b 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. 
  2. ^ Budavari, Susan, ed. (2001), The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals (13th ed.), Merck, ISBN 0911910131