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Ferrous oxalate, or iron(II) oxalate, is an inorganic compound with the formula FeC2O4 where is typically 2. These are orange compounds, poorly soluble in water.
When heated, it dehydrates and decomposes into a mixture of iron oxides and
Structure
The dihydrate FeC2O4 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
A substance is pyrophoric (from grc-gre, πυροφόρος, , 'fire-bearing') if it ignites spontaneously in air at or below (for gases) or within 5 minutes after coming into contact with air (for liquids and solids). Examples are organolit ...
iron metal, with release of carbon dioxide
Carbon dioxide ( chemical formula ) is a chemical compound made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in the gas state at room temperature. In the air, carbon dioxide is trans ...
, carbon monoxide
Carbon monoxide (chemical formula CO) is a colorless, poisonous, odorless, tasteless, flammable gas that is slightly less dense than air. Carbon monoxide consists of one carbon atom and one oxygen atom connected by a triple bond. It is the simple ...
, and water.
Natural occurrence
Anhydrous iron(II) oxalate is as yet (2020) unknown among minerals. However, the dihydrate is known, ashumboldtine
Humboldtine is a rarely occurring mineral from the mineral class of "organic compounds" with the chemical composition FeC2O4•2H2O and is therefore a water-containing iron(II) oxalate or the iron salt of oxalic acid.
Humboldtine crystallizes i ...
. A related, though much more complex mineral is stepanovite, Na g(H2O)6Fe(C2O4)3]·3H2O - an example of trioxalatoferrate(II).
See also
A number of other iron oxalates are known * Iron(III) oxalate * Potassium ferrioxalate * Sodium ferrioxalateReferences
{{Oxalates Iron(II) compounds Oxalates Inorganic compounds