Iron(II) oxalate

Iron(II) oxalate

Names
IUPAC name Iron(II) oxalate
Other names Iron oxalate Ferrous oxalate
Identifiers
CAS Number	516-03-0  6047-25-2 (dihydrate)
3D model (JSmol)	Interactive image
ECHA InfoCard	100.007.472
EC Number	208-217-4
PubChem CID	10589
InChI InChI=1S/3C2H2O4.2Fe/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;2*+3/p-6  Key: VEPSWGHMGZQCIN-UHFFFAOYSA-H
SMILES [Fe+3].[Fe+3].O=C([O-])C([O-])=O.[O-]C(=O)C([O-])=O.[O-]C(=O)C([O-])=O
Properties
Chemical formula	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) 150–160 °C (302–320 °F; 423–433 K) (dihydrate) decomposes
Boiling point	365.1 °C (689.2 °F; 638.2 K) (anhydrous)
Solubility in water	dihydrate: 0.097 g/100ml (25 °C)
Hazards
GHS pictograms
GHS signal word	Warning
GHS hazard statements	H302, H312
GHS precautionary statements	P280
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 inorganic compound with the formula FeC₂O₄(H₂O)_x where x is typically 2. These are orange compounds, poorly soluble in water.

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

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.

A number of other iron oxalates are known