Iron(II) oxalate

Chemical compound From Wikipedia, the free encyclopedia

Iron(II) oxalate

Ferrous oxalate (iron(II) oxalate) refers to inorganic compounds with the formula FeC2O4(H2O)x where x is 0 or 2. These are yellow compounds. Characteristic of metal oxalate complexes, these compounds tend to be polymeric, hence their low solubility in water.

Quick Facts Names, Identifiers ...
Iron(II) oxalate
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Names
IUPAC name
Iron(II) oxalate
Other names
Iron oxalate
Ferrous oxalate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.007.472
EC Number
  • (anhydrous): 208-217-4
  • (dihydrate): 611-981-5
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
  • (dihydrate): InChI=1S/C2H2O4.Fe.2H2O/c3-1(4)2(5)6;;;/h(H,3,4)(H,5,6);;2*1H2/q;+2;;/p-2
    Key: NPLZZSLZTJVZSX-UHFFFAOYSA-L
  • (anhydrous): [Fe+2].O=C([O-])-C([O-])=O
  • (dihydrate): C(=O)(C(=O)[O-])[O-].O.O.[Fe+2]
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 dihydrate: 150–160 °C (302–320 °F; 423–433 K)
(decomposes)
dihydrate:
0.097 g/100ml (25 °C)[1]
Hazards
GHS labelling:
GHS07: Exclamation mark[2]
Warning
H302, H312[2]
P280[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Structure and reactions

Like other iron oxalates, ferrous oxalates feature octahedral Fe centers. The dihydrate FeC2O4(H2O)x is a coordination polymer, consisting of chains of oxalate-bridged ferrous centers, each with two aquo ligands.[3]
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When heated to 120 °C, the dihydrate dehydrates, and the anhydrous ferrous oxalate decomposes near 190 °C.[4] The products of thermal decomposition is a mixture of iron oxides and pyrophoric iron metal, as well as released carbon dioxide, carbon monoxide, and water.[5]

Ferrous oxalates are precursors to iron phosphates, which are of value in batteries.[6]

Natural occurrence

Anhydrous iron(II) oxalate is unknown among minerals as of 2020. However, the dihydrate is known as humboldtine.[7][8] A related, although much more complex mineral is stepanovite.
Na[Mg(H2O)6][Fe(III)(C2O4)3]·3H2O is an unusual example of a naturally-occurring ferrioxalate.[9][8]

See also

References

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