Iron(III) oxalate

Ferric oxalate

Names
Systematic IUPAC name iron(3+) ethanedioate (2:3)
Other names Iron(III) oxalate
Identifiers
CAS Number	2944-66-3 (Anhydrous) 166897-40-1 (hexahydrate)
3D model (JSmol)	Interactive image
ChemSpider	147789
ECHA InfoCard	100.019.047
EC Number	220-951-7
PubChem CID	168963
InChI InChI=1S/3C2H2O4.2Fe/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;2*+3/p-6
SMILES [Fe+3].[Fe+3].O=C([O-])C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O
Properties
Chemical formula	C6Fe2O12
Molar mass	375.747 g/mol
Appearance	Pale yellow solid (anhydrous) Lime green solid (hexahydrate)
Odor	odorless
Solubility in water	slightly soluble
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Ferric oxalate, also known as iron(III) oxalate, is a chemical compound composed of ferric ions and oxalate ligands; it may also be regarded as the ferric salt of oxalic acid. The anhydrous material is pale yellow; however, it may be hydrated to form Fe₂(C₂O₄)₃·6H₂O which is bright green in colour

Like many oxalates, ferric oxalate has been investigated as a short term treatment for dentin hypersensitivity. It is used in certain toothpaste formulations; however, its effectiveness has been questioned.

It is used as the light-sensitive element in the Kallitype photographic printing process.

A number of other iron oxalates are known:-