Ammonium ferric citrate

Ammonium ferric citrate

260px Crystal structure of (NH4)5Fe(C6H4O7)2·2H2O
Names
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 FerriSeltz
Identifiers
CAS Number	1185-57-5 Y
ChEMBL	ChEMBL1200460 N
InChI InChI=1S/C6H8O7.Fe.H3N/c7-3(8)1-6(13,5(11)12)2-4(9)10;;/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12);;1H3/q;+3;/p-2 Y Key: FRHBOQMZUOWXQL-UHFFFAOYSA-L Y InChI=1/C6H8O7.Fe.H3N/c7-3(8)1-6(13,5(11)12)2-4(9)10;;/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12);;1H3/q;+3;/p-2 Key: FRHBOQMZUOWXQL-NUQVWONBAA
Properties
Chemical formula	C6H8O7⋅xFe3+⋅yNH3
Appearance	yellow crystals
Pharmacology
ATC code	V08CA07
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Ammonium ferric citrate has the formula (NH₄)₅Fe(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.

Uses

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.
• 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.

See also

• Food additive
• List of food additives