Iron(II) oxalate on:
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Ferrous oxalate, or iron(II) oxalate, is an
When heated, it dehydrates and decomposes into a mixture of iron oxides and
inorganic compound
In chemistry, an inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds, that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as '' inorganic chemist ...
with the formula FeC2O4 where is typically 2. These are orange compounds, poorly soluble in water.
Structure
The dihydrate FeC2O4 is acoordination polymer
A coordination polymer is an inorganic or organometallic polymer structure containing metal cation centers linked by ligands. More formally a coordination polymer is a coordination compound with repeating coordination entities extending in 1, 2, o ...
, 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 organolith ...
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 transpar ...
, 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 in ...
. 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
Ferric oxalate, also known as iron(III) oxalate, is a chemical compound composed of ferric ions and oxalate ligands; it may also be regarded as the ferric salt of oxalic acid. The anhydrous material is pale yellow; however, it may be hydrated to f ...
* Potassium ferrioxalate
Potassium ferrioxalate, also called potassium trisoxalatoferrate or potassium tris(oxalato)ferrate(III) is a chemical compound with the formula []. It often occurs as the trihydrate . Both are crystalline compounds, lime green in colour.A. Sarith ...
* Sodium ferrioxalate
References
{{Oxalates Iron(II) compounds Oxalates Inorganic compounds