Iron(II) acetate

Chemical compound From Wikipedia, the free encyclopedia

Iron(II) acetate describes compounds with formula Fe(CH3CO2)2·(H2O)x where x can be 0 (anhydrous) or 4 (tetrahydrate). The anhydrous compound is a white solid, although impure samples can be slightly colored.[1] The tetrahydrate is light green solid that is highly soluble in water.

Quick facts Names, Identifiers ...
Iron(II) acetate
Skeletal formula of iron(II) acetate
Skeletal formula of iron(II) acetate
Names
IUPAC name
Iron(II) acetate
Other names
Ferrous acetate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.019.492 Edit this at Wikidata
RTECS number
  • AI3850000
UNII
  • InChI=1S/2C2H4O2.Fe/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 checkY
    Key: LNOZJRCUHSPCDZ-UHFFFAOYSA-L checkY
  • InChI=1/2C2H4O2.Fe/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2
    Key: LNOZJRCUHSPCDZ-NUQVWONBAS
  • coordination form: CC(O1)O[Fe]12OC(O2)C
  • ionic form: CC(=O)[O-].[Fe+2].CC(=O)[O-]
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 labelling:
GHS07: Exclamation mark[3]
Warning
H315, H319, H335[3]
P261, P305+P351+P338[3]
NFPA 704 (fire diamond)
[4]
NFPA 704 four-colored diamondHealth 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
2
0
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation and structure

Although anhydrous ferrous acetate can be viewed as a simple salt, X-ray crystallography reveals a complicated polymeric structure.[1] Color code: red = O, blue = Fe, gray = C, white = H.

Iron powder reacts with acetic acid to give the ferrous acetate, with evolution of hydrogen gas:[5][1]

Fe + 2 CH3CO2H → Fe(CH3CO2)2 + H2

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]


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

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

Uses

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

References

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