Iron(II) acetate

Iron(II) acetate

Names
IUPAC name Iron(II) acetate
Other names Ferrous acetate
Identifiers
CAS Number	3094-87-9
3D model (Jmol)	Interactive image
ChemSpider	17323
ECHA InfoCard	100.019.492
PubChem	161387
RTECS number	AI3850000
InChI InChI=1S/2C2H4O2.Fe/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 Key: LNOZJRCUHSPCDZ-UHFFFAOYSA-L InChI=1/2C2H4O2.Fe/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 Key: LNOZJRCUHSPCDZ-NUQVWONBAS
SMILES [Fe+2].[O-]C(=O)C.[O-]C(=O)C
Properties
Chemical formula	C4H6FeO4
Molar mass	173.93 g·mol^−1
Appearance	White crystals (anhydrous) Light green crystals (tetrahydrate)
Odor	Odorless
Density	1.734 g/cm^3 (−73 °C)[1]
Melting point	190–200 °C (374–392 °F; 463–473 K) decomposes[2][3]
Solubility in water	Soluble[2]
Structure
Crystal structure	Orthorhombic, oP75 (200 K)[1]
Space group	Pbcn, No. 60 (200 K)[1]
Point group	2/m 2/m 2/m (200 K)[1]
Lattice constant	a = 18.1715(4) Å, b = 22.1453(5) Å, c = 8.2781(2) Å (200 K)[1] α = 90°, β = 90°, γ = 90°
Hazards
GHS pictograms	[3]
GHS signal word	Warning
GHS hazard statements	H315, H319, H335[3]
GHS precautionary statements	P261, P305+351+338[3]
EU classification (DSD)	Xi
R-phrases	R36/37/38
S-phrases	S26, S36
NFPA 704	[4] 0 2 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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Infobox references

Iron(II) acetate is an coordination complex with formula Fe(C₂H₃O₂)₂. It is a white solid although impure samples can be slightly colored. A light green tetrahydrate is also known, which is highly soluble in water.

Preparation and structure

Iron powder reacts with hot acetic acid to give the product:^[1]

Fe + 2 CH₃CO₂H → Fe(CH₃CO₂)₂ + H₂

It adopts a polymeric structure with octahedral Fe(II) centers bridged by acetate ligands. It is not a salt.^[1]

The hydrate can 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. Retrieved 2014-08-02.
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". https://www.fishersci.ca. Fair Lawn, New Jersey: Fisher Scientific, Inc. Retrieved 2014-08-02. External link in |website= (help)
5. Synthesis of Iron(II) acetate hydrate (ferrous acetate)
6. Wildermuth, Egon; Stark, Hans; Friedrich, Gabriele; Ebenhöch, Franz Ludwig; Kühborth, Brigitte; Silver, Jack; Rituper, Rafael (2005), "Iron Compounds", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a14_591
7. Ebonizing Wood with Ferric Acetate

Salts and the ester of the acetate ion
AcOH																	He
LiOAc	Be(OAc)2 BeAcOH											B(OAc)3	ROAc	NH4OAc	AcOAc	FAc	Ne
NaOAc	Mg(OAc)2											Al(OAc)3 ALSOL Al(OAc)2OH Al2SO4(OAc)4	Si	P	S	ClAc	Ar
KOAc	Ca(OAc)2	Sc(OAc)3	Ti(OAc)4	VO(OAc)3	Cr(OAc)2	Mn(OAc)2 Mn(OAc)3	Fe(OAc)2 Fe(OAc)3	Co(OAc)2, Co(OAc)3	Ni(OAc)2	Cu(OAc)2	Zn(OAc)2	Ga(OAc)3	Ge	As(OAc)3	Se	BrAc	Kr
RbOAc	Sr(OAc)2	Y(OAc)3	Zr(OAc)4	Nb	Mo(OAc)2	Tc	Ru(OAc)2 Ru(OAc)3 Ru(OAc)4	Rh2(OAc)4	Pd(OAc)2	AgOAc	Cd(OAc)2	In	Sn(OAc)2 Sn(OAc)4	Sb(OAc)3	Te	IAc	Xe
CsOAc	Ba(OAc)2		Hf	Ta	W	Re	Os	Ir	Pt(OAc)2	Au	Hg2(OAc)2, Hg(OAc)2	TlOAc Tl(OAc)3	Pb(OAc)2 Pb(OAc)4	Bi(OAc)3	Po	At	Rn
Fr	Ra		Rf	Db	Sg	Bh	Hs	Mt	Ds	Rg	Cn	Nh	Fl	Mc	Lv	Ts	Og
		↓
		La(OAc)3	Ce(OAc)x	Pr	Nd	Pm	Sm(OAc)3	Eu(OAc)3	Gd(OAc)3	Tb	Dy(OAc)3	Ho(OAc)3	Er	Tm	Yb(OAc)3	Lu(OAc)3
		Ac	Th	Pa	UO2(OAc)2	Np	Pu	Am	Cm	Bk	Cf	Es	Fm	Md	No	Lr