Iron(II) oxalate

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

Iron(II) oxalate
Names
IUPAC name
Iron(II) oxalate
Other names
Iron oxalate
Ferrous oxalate
Identifiers
CAS Number
3D model (JSmol)
ECHA InfoCard 100.007.472
EC Number
  • 208-217-4
PubChem CID
UNII
CompTox Dashboard (EPA)
Properties
Chemical formula
 FeC2O4 (anhydrous)
FeC2O4 • 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)
(anhydrous)[1]
150–160 °C (302–320 °F; 423–433 K)
(dihydrate) decomposes
Boiling point 365.1 °C (689.2 °F; 638.2 K)
(anhydrous)[1]
Solubility in water
 dihydrate:
0.097 g/100ml (25 °C)[2]
Hazards
GHS pictograms [3]
GHS Signal word Warning
GHS hazard statements
 H302, H312[3]
GHS precautionary statements
 P280[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

Structure

The dihydrate FeC2O4 • 2H2O is a coordination polymer, consisting of chains of oxalate-bridged ferrous centers, each with two aquo ligands.[4]

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]

See also

A number of other iron oxalates are known

  • Iron(III) oxalate
  • Potassium ferrioxalate
  • Sodium ferrioxalate

References
  1. http://www.guidechem.com/cas-516/516-03-0.html
  2. http://chemister.ru/Database/properties-en.php?dbid=1&id=2084
  3. 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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