Iron(II) citrate

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Iron(II) citrate

Skeletal formula of iron(II) citrate

Powdered Iron(II) citrate hydrate
Names
IUPAC name
Iron(II) hydrogen 2-hydroxy-1,2,3-tricarboxylpropane
Other names
Iron(II) citrate, Ferrous citrate, Iron citrate
Identifiers
3D model (
JSmol
)
ChemSpider
ECHA InfoCard
 100.041.463 Edit this at Wikidata
EC Number
  • hydrogen citrate: 245-625-1
UNII
  • InChI=1S/C6H8O7.Fe/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);/q;+2/p-2
    Key: APVZWAOKZPNDNR-UHFFFAOYSA-L
  • hydrogen citrate: C(C(=O)O)C(CC(=O)[O-])(C(=O)[O-])O.[Fe+2]
Properties
FeC6H6O7
Molar mass 245.95644 g/mol
Appearance slightly gray-green powder or white crystals[1] unstable
Density 1.91 g/cm3
Melting point decomposes[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Ferrous citrate, also known as iron(II) citrate or iron(2+) citrate, describes coordination complexes containing citrate anions with Fe2+ formed in aqueous solution. Although a number of complexes are possible (or even likely), only one complex has been crystallized. That complex is the coordination polymer with the formula [Fe(H2O)6]2+{[Fe(C6H5O7)(H2O)]−}2.2H2O, where C6H5O73- is HOC(CH2CO2−)2(CO2−, i.e., the triple conjugate base of citric acid wherein the three carboxylic acid groups are ionized.[3] Ferrous citrates are all paramagnetic, reflecting the weak crystal field of the carboxylate ligands.[4]

Structure of the anionic coordination polymer {[Fe(C6H5O7)(H2O)]−}n.[3] (legend: red = O, gray = C, blue = Fe, white = H).

Ferrous citrates are produced by treating

ferric citrates
.

It is a nutrient supplement approved by the FDA.[6][7]

See also

References

  1. ISBN 978-1-889788-86-9
    .
  2. ^
    ISBN 0-8493-8671-3
    .
  3. ^
    PMID 830693
    .
  4. S2CID 2301450
    .
  5. ^ "CFR - Code of Federal Regulations Title 21". www.fda.gov. U.S. Food and Drug Administration. 2013-06-01. Retrieved 2014-08-02.
  6. ^ PubChem. "Iron(II) citrate". pubchem.ncbi.nlm.nih.gov. Retrieved 2022-08-22.
  7. ^ "Substances Added to Food (formerly EAFUS)". www.cfsanappsexternal.fda.gov. Retrieved 2022-08-22.


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