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Iron(III) acetate
Names

IUPAC name iron(III) acetate
Other names basic iron(III) acetate, iron(III) oxyacetate, iron(III) Acetate
Identifiers
CAS Number	1834-30-6
3D model (JSmol)	Interactive image coordination complex: Interactive image
ChemSpider	144555
PubChem CID	164887
UNII	CZZ8832SI5
InChI InChI=1/3C2H4O2.Fe/c31-2(3)4;/h31H3,(H,3,4);/q;;;+3/p-3Key: PVFSDGKDKFSOTB-DFZHHIFOAZ
SMILES CC(=O).CC(=O).CC(=O). coordination complex: O1(C)O6(23)()(O(C)O4)O(C)O24()(O(C)O5)O(C)O135()OC(C)O6
Properties
Chemical formula	C₁₃H₂₇Fe₃O₁₈
Molar mass	650.9 g/mol
Appearance	brownish-red powder
Solubility in water	Insoluble
Solubility	soluble in ethanol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references

Chemical compound

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 (OAc is CH₃CO₂). Commonly, the salt is known as "basic iron acetate". The formation of the red-brown complex was once used as a test for ferric ions.

Structure and synthesis

structure of the cation called basic iron acetate as determined from X-ray crystallography

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. A typical precursor is freshly precipitated iron oxide/hydroxide, which is halide-free.

Early work showed that the cation is trinuclear. 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. The compound was an early example of a molecular complex of iron that features an oxide ligand. The cation has idealized D_3h symmetry.

Reactions

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. Cl. Reduction of the cation affords the neutral mixed-valence derivative that contains one ferrous and two ferric centers. Mixed metal species are known such as .

Related compounds

Chromium(III), ruthenium(III), vanadium(III), manganese(III) and rhodium(III) form analogous compounds. 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.

Uses

Materials prepared by heating iron, acetic acid, and air, loosely described as basic iron acetates, are used as dyes and mordants.

Iron acetate is often brushed upon untreated wood to give it an aged appearance.

References

"Iron(III) Acetate". EndMemo. Retrieved 18 April 2015.
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H. Lux (1963). "Basic Iron(III) Acetate". In Georg Brauer (ed.). Handbook of Preparative Inorganic Chemistry. p. 1508.
Weinland, R.; Dinkelacker, P. (July 1909). "Über Salze einer Hexaacetato(formiato)-trichrombase. II". Berichte der Deutschen Chemischen Gesellschaft. 42 (3): 2997–3018. doi:10.1002/cber.19090420318.
Figgis, B. N.; Robertson, G. B. (13 February 1965). "Crystal-Molecular Structure and Magnetic Properties of Cr₃(CH₃COO)₆OCl.5H₂O". Nature. 205 (4972): 694–695. Bibcode:1965Natur.205..694F. doi:10.1038/205694a0. S2CID 4283321. This paper describes the isostructure chromium and iron compounds.
Blake, Antony B.; Yavari, Ahmad; Hatfield, William E.; Sethulekshmi, C. N. (1985). "Magnetic and spectroscopic properties of some heterotrinuclear basic acetates of chromium(III), iron(III), and divalent metal ions". Journal of the Chemical Society, Dalton Transactions (12): 2509–2520. doi:10.1039/DT9850002509.
Holleman, Arnold Frederik; Wiberg, Egon (2001), Wiberg, Nils (ed.), Inorganic Chemistry, translated by Eagleson, Mary; Brewer, William, San Diego/Berlin: Academic Press/De Gruyter, ISBN 0-12-352651-5
Paul, Ram C.; Narula, Ramesh C.; Vasisht, Sham K. (December 1978). "Iron(III) acetates". Transition Metal Chemistry. 3 (1): 35–38. doi:10.1007/BF01393501. S2CID 94447648.