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
3D model (JSmol)
ECHA InfoCard 100.007.472
EC Number
  • 208-217-4
UNII
Properties
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]
dihydrate:
0.097 g/100ml (25 °C)[2]
Hazards
GHS pictograms [3]
GHS Signal word Warning
H302, H312[3]
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]

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

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.
  6. https://www.mindat.org/min-1946.html
  7. https://www.ima-mineralogy.org/Minlist.htm
  8. https://www.mindat.org/min-3763.html
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