Iron(III) acetate
| Names | |
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| IUPAC name
iron(III) acetate
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| Other names
basic iron(III) acetate, iron(III) oxyacetate, iron(III) Acetate
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| Identifiers | |
3D model (JSmol)
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CompTox Dashboard (EPA)
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| Properties | |
| C14H27Fe3O18 | |
| Molar mass | 650.9 g/mol |
| Appearance | brownish-red powder |
| Insoluble | |
| Solubility | soluble in ethanol[1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Ferric acetate is the iron compound with the formula Fe3O(O2CCH3)6(H2O)3]O2CCH3. This red brown solid is the acetate salt of the coordination complex [Fe3O(OAc)6(H2O)3]+ (OAc− is CH3CO2−). Commonly, the salt is known as "basic iron acetate".[2] The formation of the red-brown complex was once used as a test for ferric ions.[3]
Structure and synthesis
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Basic iron acetate forms on treating aqueous solutions of iron(III) sources with acetate salts. It is slowly soluble in water and poorly soluble in acetic acid.[5] A typical precursor is freshly precipitated iron oxide/hydroxide, which is halide-free.[6]
Early work showed that the cation is trinuclear.[7] The Fe centres are equivalent, each being octahedral, being bound to six oxygen ligands, including a triply bridging oxide at the center of the equilateral triangle.[8] The compound was an early example of a molecular complex of iron that features an oxide ligand. The cation has idealized D3h symmetry.
Reactions
[edit | edit source]The terminal aqua ligands on the trimetallic framework can be substituted with other ligands, such as pyridine and dimethylformamide. Many different salts are known by exchanging the anion, e.g. [Fe3(μ3-O)(OAc)6(H2O)3]Cl. Reduction of the cation affords the neutral mixed-valence derivative that contains one ferrous and two ferric centers.[2] Mixed metal species are known such as [Fe2CoO(OAc)6(H2O)3].[9]
Related compounds
[edit | edit source]Chromium(III), ruthenium(III), vanadium(III), manganese(III) and rhodium(III) form analogous compounds.[10] Iron(III) acetate (lacking the oxo ligand) has been claimed as a red coloured compound from the reaction of silver acetate and iron(III) chloride.[11]
Uses
[edit | edit source]Materials prepared by heating iron, acetic acid, and air, loosely described as basic iron acetates, are used as dyes and mordants.[2]
Iron acetate is often brushed upon untreated wood to give it an aged appearance.[citation needed]
See also
[edit | edit source]References
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