Iron(II) acetate

Iron(II) acetate is a coordination complex with formula Fe(O2CCH3)2. It is a white solid, although impure samples can be slightly colored.[1] A light green tetrahydrate is also known, which is highly soluble in water.

Iron(II) acetate
Names
IUPAC name
Iron(II) acetate
Other names
Ferrous acetate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.019.492
RTECS number
  • AI3850000
UNII
Properties
C4H6FeO4
Molar mass 173.933 g·mol−1
Appearance White crystals (anhydrous)
Light green crystals (tetrahydrate)
Odor Odorless
Density 1.734 g/cm3 (−73 °C)[1]
Melting point 190–200 °C (374–392 °F; 463–473 K)
decomposes[2][3]
Soluble[2]
Structure
Orthorhombic, oP75 (200 K)
Pbcn, No. 60 (200 K)[1]
2/m 2/m 2/m (200 K)
a = 18.1715(4) Å, b = 22.1453(5) Å, c = 8.2781(2) Å (200 K)
α = 90°, β = 90°, γ = 90°
Hazards
GHS pictograms [3]
GHS Signal word Warning
H315, H319, H335[3]
P261, P305+351+338[3]
NFPA 704 (fire diamond)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Preparation and structure
Although ferrous acetate can be viewed as a simple salt, X-ray crystallography reveals a complicated polymeric structure.[1]

Iron powder reacts with hot acetic acid to give the ferrous acetate, with evolution of hydrogen gas:[1]

Fe + 2 CH3CO2H → Fe(CH3CO2)2 + H2

It can also be made from the insoluble, olive green, Iron(II) carbonate.

It adopts a polymeric structure with octahedral Fe(II) centers interconnected by acetate ligands. It is a coordination polymer.[1]

A hydrated form be made by the reaction of ferrous oxide or ferrous hydroxide with acetic acid.[5]

Reaction of scrap iron with acetic acid affords a brown mixture of various iron(II) and iron(III) acetates that are used in dyeing.[6]

Uses

Ferrous acetate is used as a mordant by the dye industry. Ebonizing wood is one such process.[7]

References
  1. Weber, Birgit; Betz, Richard; Bauer, Wolfgang; Schlamp, Stephan (2011). "Crystal Structure of Iron(II) Acetate". Zeitschrift für anorganische und allgemeine Chemie. 637: 102–107. doi:10.1002/zaac.201000274.
  2. Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. ISBN 978-1-4200-9084-0.
  3. Sigma-Aldrich Co., Iron(II) acetate. Retrieved on 2014-05-03.
  4. "MSDS of Ferrous acetate". fishersci.ca. Fair Lawn: Fisher Scientific. Retrieved 2014-08-02.
  5. "Synthesis of Iron(II) acetate hydrate (ferrous acetate)". Archived from the original on 2013-08-25. Retrieved 2009-01-07.
  6. Wildermuth, Egon; Stark, Hans; Friedrich, Gabriele; Ebenhöch, Franz Ludwig; Kühborth, Brigitte; Silver, Jack; Rituper, Rafael (2000). "Iron Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a14_591.
  7. Ebonizing Wood with Ferric Acetate
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