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Iron(III) acetate

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Ferric acetate is the iron compound with the formula . 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". The formation of the red-brown complex was once used as a test for ferric ions.

Structure and synthesis

thumb|left|200px|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 D3h 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. [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.

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 used in ebonising, which is a process for darkening wood, giving it an appearance similar to ebony.

References

References

  1. "Iron(III) Acetate".
  2. (2005). "Encyclopedia of inorganic chemistry". Wiley.
  3. (1902). "The Analysis of Steel-Works Materials". Longmans, Green.
  4. {{RubberBible87th
  5. (March 2007). "Manual of Chemistry". Read Books.
  6. H. Lux. (1963). "Handbook of Preparative Inorganic Chemistry".
  7. (July 1909). "Über Salze einer Hexaacetato(formiato)-trichrombase. II". Berichte der Deutschen Chemischen Gesellschaft.
  8. (13 February 1965). "Crystal-Molecular Structure and Magnetic Properties of Cr3(CH3.COO)6OCl.5H2O". Nature.
  9. (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.
  10. {{Holleman&Wiberg
  11. (December 1978). "Iron(III) acetates". Transition Metal Chemistry.
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