Iron(II) oxalate

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Iron(II) oxalate
Iron(II)-oxalate-sample.jpg
Fe(C2O4)-2D-ionic.png
Names
IUPAC name
Iron(II) oxalate
Other names
Iron oxalate
Ferrous oxalate
Identifiers
3D model (JSmol)
ECHA InfoCard 100.007.472 Edit this at Wikidata
EC Number
  • 208-217-4
UNII
  • InChI=1S/3C2H2O4.2Fe/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;2*+3/p-6 ☒N
    Key: VEPSWGHMGZQCIN-UHFFFAOYSA-H ☒N
  • [Fe+2].O=C([O-])-C([O-])=O
Properties
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)
(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 labelling:
GHS07: Exclamation mark[3]
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

Ferrous oxalate, or iron(II) oxalate, is an inorganic compound with the formula FeC2O4 · x H2O where x is typically 2. These are orange compounds, poorly soluble in water.

Structure[]

The dihydrate FeC2O4 · 2 H2O 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 , 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. ^ a b "CAS 516-03-0 products price,suppliers".
  2. ^ "Iron(II) oxalate dihydrate".
  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 (8): 467–475. Bibcode:2008PCM....35..467E. doi:10.1007/s00269-008-0241-7. S2CID 98739882.
  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 (13): 1273–1280. doi:10.1039/b514565a.
  6. ^ "Humboldtine".
  7. ^ a b "List of Minerals". 21 March 2011.
  8. ^ "Stepanovite".
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