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Ferric oxalate

Ferric oxalate

Ferric oxalate, also known as iron(III) oxalate, refers to inorganic compounds with the formula (H2O)x but could also refer to salts of 3-. (H2O)x are coordination polymers with varying degrees of hydration. The coordination complex with the formula 3- forms a variety of salts, a well-known example being potassium ferrioxalate. This article emphasizes the coordination polymers.

Structure

Tetrahydrate

thumb| Structure of hydrated ferric oxalate Color code: red=O, white = H, blue = Fe, gray = C.| left| 320px ]]

thumb| Room temperature Mössbauer spectrum of ]] According to X-ray crystallography of the tetrahydrate , iron is octahedral. The oxalate ligands are bridging. Some through all four oxygen atoms, some with two oxygen atoms. Half of the water is lattice water, being situated between chains of Fe oxalates. Mössbauer spectrum of exhibits an isomer shift of 0.38 mm/s and a quadrupole splitting of 0.40 mm/s, suggesting a high spin in octahedral coordination.

Production

Ferric oxalate may be produced by reaction of iron(III) hydroxide and solution of oxalic acid:

:

Uses

Dentistry

Like many oxalates, ferric oxalate has been investigated as a short-term treatment for dentin hypersensitivity. It is used in certain toothpaste formulations; however, its effectiveness has been questioned.

Photography

Ferric oxalate is used as the light-sensitive element in the Kallitype photographic printing process; and the platinotype process Platinum/Palladium Printing.

Batteries

Ferric oxalate tetrahydrate has been investigated as a possible cheap material for the positive electrode of lithium-iron batteries. It can intercalate lithium ions at an average potential of 3.35 V, and has shown a sustainable capacity of 98 mAh/g.

Organic synthesis

Ferric oxalate hexahydrate is used with sodium borohydride for radical Markovnikov hydrofunctionalization reactions of alkenes.

References

References

  1. (2016). "Oxalate-mediated long-range antiferromagnetism order in Fe2(C2O4)3·4H2O". Dalton Transactions.
  2. (2004). "Clinical evaluation of ferric oxalate in relieving dentine hypersensitivity". Journal of Oral Rehabilitation.
  3. (29 December 2010). "Dentin Hypersensitivity and Oxalates: a Systematic Review". Journal of Dental Research.
  4. (2001-04-15). "Encyclopedia of Reagents for Organic Synthesis". Wiley.
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oxalates iron(iii)-compounds
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