Ammonium ferric citrate

Structure of ammonium ferric citrate
Crystal structure of[NH4]5[Fe(C6H4O7)2]·2H2O[1]
Powdered Ammonium Ferric Citrate
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
3D model (JSmol)	Interactive image
ChEBI	CHEBI:31604
ChEMBL	ChEMBL1200460 N
ChemSpider	13804 N
ECHA InfoCard	100.013.351
EC Number	214-686-6
E number	E381(antioxidants, ...)
KEGG	D01644[2]
PubChemCID	14457
UNII	UVP74NG1C5 Y
CompTox Dashboard(EPA)	DTXSID9040477
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
SMILES C(C(=O)[O-])C(CC(=O)[O-])(C(=O)[O-])O.N.[Fe+3]
Properties
Chemical formula	C6H8O7⋅xFe3+⋅yNH3
Appearance	yellow crystals or powder
Pharmacology
ATC code	V08CA07 (WHO)
Hazards
Safety data sheet (SDS)	[1]
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Ammonium ferric citrate (also known asferric ammonium citrate orammoniacal ferrous citrate) has the formula[NH₄]{y}[Fe{x}(C₆H₄O₇)]. Theiron in this compound istrivalent. All threecarboxyl groups and the centralhydroxyl group ofcitric acid aredeprotonated. A distinguishing feature of this compound is that it is very soluble in water, in contrast toferric citrate which is not very soluble.^[3]

In its crystal structure eachmoiety ofcitric acid has lost four protons. The deprotonatedhydroxyl group and two of the carboxylate groups ligate to the ferric center, while the third carboxylate group coordinates with the ammonium.^[1]

Ammonium ferric citrate has a range of uses, including:

• As a food ingredient, it has anINS number 381, and is used as anacidity regulator.^[4] Most notably used in the Scottish beverageIrn-Bru.
• Water purification^[5]
• As a reducing agent of metal salts of low activity like gold andsilver^[5]
• Withpotassium ferricyanide as part of thecyanotype photographic process
• Used inKligler's Iron Agar (KIA) test to identifyenterobacteriaceae bacteria by observing their metabolism of different sugars, producinghydrogen sulfide^[6]
• In medical imaging, ammonium ferric citrate is used as acontrast medium.
• As ahematinic^[7]

• Food additive
• List of food additives

• Ammonium compounds
• Citrates
• Iron(III) compounds
• MRI contrast agents
• Photographic chemicals
• Double salts

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