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Iron(II) oxalate
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Iron(II) oxalate
Ferrous oxalate (iron(II) oxalate) refers to the inorganic compound with the formula FeC2O4 (anhydrous) or FeC2O4·2H2O (dihydrate). These are yellow compounds. Characteristic of metal oxalate complexes, these compounds tend to be polymeric, hence their low solubility in water. The dihydrate is hygroscopic.
Like other iron oxalates, ferrous oxalates feature octahedral Fe centers. The dihydrate FeC2O4·2H2O is a coordination polymer, consisting of chains of oxalate-bridged ferrous centers, each with two aquo ligands.
(H2O)2-chain-from-xtal-2008-CM-3D-balls.png)
When heated to 120 °C (248 °F), the dihydrate dehydrates, and the anhydrous ferrous oxalate decomposes near 190 °C (374 °F). The products of thermal decomposition in a sealed environment are a mixture of iron oxides, pyrophoric iron, carbon dioxide, carbon monoxide, and water.
Ferrous oxalates are precursors to iron phosphates, which are of value in batteries.
Anhydrous iron(II) oxalate is unknown among minerals as of 2020[update]. However, the dihydrate is known as humboldtine. A related mineral is stepanovite (Na[Mg(H2O)6][Fe(C2O4)3]·3H2O), an unusual example of a naturally occurring ferrioxalate.
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Iron(II) oxalate
Ferrous oxalate (iron(II) oxalate) refers to the inorganic compound with the formula FeC2O4 (anhydrous) or FeC2O4·2H2O (dihydrate). These are yellow compounds. Characteristic of metal oxalate complexes, these compounds tend to be polymeric, hence their low solubility in water. The dihydrate is hygroscopic.
Like other iron oxalates, ferrous oxalates feature octahedral Fe centers. The dihydrate FeC2O4·2H2O is a coordination polymer, consisting of chains of oxalate-bridged ferrous centers, each with two aquo ligands.
When heated to 120 °C (248 °F), the dihydrate dehydrates, and the anhydrous ferrous oxalate decomposes near 190 °C (374 °F). The products of thermal decomposition in a sealed environment are a mixture of iron oxides, pyrophoric iron, carbon dioxide, carbon monoxide, and water.
Ferrous oxalates are precursors to iron phosphates, which are of value in batteries.
Anhydrous iron(II) oxalate is unknown among minerals as of 2020[update]. However, the dihydrate is known as humboldtine. A related mineral is stepanovite (Na[Mg(H2O)6][Fe(C2O4)3]·3H2O), an unusual example of a naturally occurring ferrioxalate.
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