Iron(II) Oxalate
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Iron II Oxalate
Iron(II) oxalate
IUPAC name
Iron(II) oxalate
Other names
Iron oxalate
Ferrous oxalate
3D model (JSmol)
ECHA InfoCard 100.007.472 Edit this at Wikidata
EC Number
  • 208-217-4
FeC2O4 (anhydrous)
FeC2O4 o 2H2O (dihydrate)
Molar mass 143.86 g/mol (anhydrous)
179.89 g/mol (dihydrate)
Appearance yellow powder
Odor odorless
Density 2.28 g/cm3
Melting point 190 °C (374 °F; 463 K)
150-160 °C (302-320 °F; 423-433 K)
(dihydrate) decomposes
Boiling point 365.1 °C (689.2 °F; 638.2 K)
0.097 g/100ml (25 °C)[2]
GHS pictograms GHS07: Harmful[3]
GHS Signal word Warning
H302, H312[3]
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

Ferrous oxalate, or iron(II) oxalate, is an inorganic compound with the formula FeC2O4 o xH2O where x is typically 2. These are orange compounds, poorly soluble in water.


The dihydrate FeC2O4 o 2H2O is a coordination polymer, consisting of chains of oxalate-bridged ferrous centers, each with two aquo ligands.[4]
Ball-and-stick model of a chain in the crystal structure of iron(II) oxalate dihydrate

When heated, it dehydrates and decomposes into a mixture of iron oxides and pyrophoric iron metal, with release of carbon dioxide, carbon monoxide, and water.[5]

Natural occurrence

Anhydrous iron(II) oxalate is as yet (2020) unknown among minerals. However, the dihydrate is known, as humboldtine.[6][7] A related, though much more complex mineral is stepanovite, Na[Mg(H2O)6][Fe(C2O4)3]·3H2O - an example of trioxalatoferrate(II).[8][7]

See also

A number of other iron oxalates are known


  1. ^ a b
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  3. ^ a b c Sigma-Aldrich Co., Iron(II) oxalate dihydrate. Retrieved on 2014-05-03.
  4. ^ Echigo, Takuya; Kimata, Mitsuyoshi (2008). "Single-crystal X-ray diffraction and spectroscopic studies on humboldtine and lindbergite: weak Jahn-Teller effect of Fe2+ ion". Phys. Chem. Minerals. 35: 467-475. doi:10.1007/s00269-008-0241-7.
  5. ^ Hermanek, Martin; Zboril, Radek; Mashlan, Miroslav; et al. (2006). "Thermal behaviour of iron(II) oxalate dihydrate in the atmosphere of its conversion gases". J. Mater. Chem. 16: 1273-1280.
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  7. ^ a b
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