Iron(II) oxalate

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Iron(II) oxalate
IUPAC name
Iron(II) oxalate
Other names
Iron oxalate
Ferrous oxalate
516-03-0 N
6047-25-2 (dihydrate) N
EC Number 208-217-4
Jmol 3D model Interactive image
PubChem 10589
FeC2O4 (anhydrous)
FeC2O4·2 H2O (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 GHS-pictogram-exclam.svg[3]
GHS signal word Warning
H302, H312[3]
Harmful Xn
R-phrases R21/22
S-phrases S24/25
Flash point 188.8 °C (371.8 °F; 461.9 K)
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 a chemical compound consisting of one iron(II) ion (Fe2+) and one oxalate ion (C2O42−). It has the chemical formula FeC2O4.

Iron(II) oxalate is more commonly encountered as the dihydrate, FeC2O4·2H2O, CAS # 6047-25-2. Its crystal structure consists of chains of oxalate-bridged iron atoms, capped by water molecules.[4]
Ball-and-stick model of a chain in the crystal structure of iron(II) oxalate dihydrate

When heated, it dehydrates and decomposes into carbon dioxide, carbon monoxide, iron oxides and pyrophoric black iron. [5]


Iron(II) oxalate is harmful when swallowed. It may cause irritation to eyes and skin.

See also[edit]

A number of other iron oxalates are known


  1. ^ a b
  2. ^
  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.