Iron(III) acetate

Iron(III) acetate

Iron (III) acetate, commonly known as basic iron acetate, is a chemical compound with the formula [Fe3O(OAc)6(H2O)3] OAc (OAc is CH3CO2-). It is a salt, with one ionic acetate anion and the triangular cation [Fe3O(OAc)6(H2O)3] +. [Figgis, B. N.; Robertson, G. B. “Crystal-Molecular Structure and Magnetic Properties of Cr3(CH3.COO)6OCl.5H2O” Nature 1965, volume 205, pages 694-5. doi|10.1038/205694a0] . Each metal in the cation is bonded to six oxygen atoms, including a triply bridging oxide at the center of the equilateral triangle. The water ligands can be replaced with other Lewis bases, such as pyridine.

Reduction of this species affords the mixed-valence derivative that contains one ferrous center in addition to two ferric centers.

In general acetate stabilizes multimetallic structures. Other examples include chromium(II) acetate, copper(II) acetate, and basic beryllium acetate. [Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.]

Other basic acetates

Other metals give analogous structures: chromium, ruthenium, vanadium, and rhodium. Additionally, mixed metal species are known such as the charge-neutral [Fe2CoO(OAc)6(H2O)3] . [Blake, A. B. Yavari, A.; Hatfield, W. E.; Sethulekshmi, C. N. “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, 1985, pages 2509 - 2520. DOI|10.1039/DT9850002509.]

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