iron(II) acetate
{{chembox
| Verifiedfields = changed
| Watchedfields = changed
| verifiedrevid = 446429319
| Name = Iron(II) acetate
| ImageFile = Iron(II) acetate.png
| ImageSize = 150px
| ImageName = Skeletal formula of iron(II) acetate
| IUPACName = Iron(II) acetate
| OtherNames = Ferrous acetate
|Section1={{Chembox Identifiers
| SMILES = CC(O1)O[Fe]12OC(O2)C
| SMILES_Comment = coordination form
| SMILES1 = CC(=O)[O-].[Fe+2].CC(=O)[O-]
| SMILES1_Comment = ionic form
| ChemSpiderID = 17323
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| PubChem = 18344
| InChI = 1/2C2H4O2.Fe/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2
| InChIKey = LNOZJRCUHSPCDZ-NUQVWONBAS
| StdInChI = 1S/2C2H4O2.Fe/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = LNOZJRCUHSPCDZ-UHFFFAOYSA-L
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| CASNo = 3094-87-9
| CASNo2 = 19807-28-4
| CASNo2_Comment = tetrahydrate
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = L80I7M6D3Q
| RTECS = AI3850000
}}
|Section2={{Chembox Properties
| C=4 | H=6 | Fe=1 | O=4
| Appearance = White crystals (anhydrous)
Light green crystals (tetrahydrate)
| Odor = Odorless
| Density = 1.734 g/cm3 (−73 °C)
| Solubility = Soluble{{CRC90}}
| SolubleOther =
| MeltingPtC = 190-200
| MeltingPt_notes =
decomposes
| MagSus =
}}
|Section3={{Chembox Structure
| CrystalStruct = Orthorhombic, oP75 (200 K)
| SpaceGroup = Pbcn, No. 60 (200 K)
| PointGroup = 2/m 2/m 2/m (200 K)
| LattConst_a = 18.1715(4) Å
| LattConst_b = 22.1453(5) Å
| LattConst_c = 8.2781(2) Å (200 K)
| LattConst_alpha = 90
}}
|Section7={{Chembox Hazards
| GHSPictograms = {{GHS07}}{{Sigma-Aldrich|id=517933|name=Iron(II) acetate|accessdate=2014-05-03}}
| GHSSignalWord = Warning
| HPhrases = {{H-phrases|315|319|335}}
| PPhrases = {{P-phrases|261|305+351+338}}
| NFPA-H = 2
| NFPA-F = 0
| NFPA-R = 0
| NFPA_ref = {{cite web|title = MSDS of Ferrous acetate |url = https://www.fishersci.ca/viewmsds.do?catNo=AC305370500 |website=fishersci.ca |publisher = Fisher Scientific |place = Fair Lawn|access-date = 2014-08-02}}
}}
}}
Iron(II) acetate describes compounds with formula {{chem2|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.{{cite journal |doi=10.1002/zaac.201000274|title=Crystal Structure of Iron(II) Acetate|year=2011|last1= Weber|first1=Birgit|last2=Betz|first2=Richard|last3=Bauer|first3 =Wolfgang|last4=Schlamp|first4=Stephan|journal=Zeitschrift für anorganische und allgemeine Chemie|volume=637|pages=102–107}} The tetrahydrate is light green solid that is highly soluble in water.
Preparation and structure
File:Structure of anhydrous ferrous acetate (QQQFUY01).png reveals a complicated polymeric structure. 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:{{Cite web |url=http://www.ims.demokritos.gr/people/tbou/iron_acetate.html |title=Synthesis of Iron(II) acetate hydrate (ferrous acetate) |access-date=2009-01-07 |archive-url=https://web.archive.org/web/20130825122529/http://www.ims.demokritos.gr/people/tbou/iron_acetate.html |archive-date=2013-08-25 |url-status=dead }}
: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.{{Ullmann | doi = 10.1002/14356007.a14_591 | title = Iron Compounds | year = 2000 | last1 = Wildermuth | first1 = Egon | last2 = Stark | first2 = Hans | last3 = Friedrich | first3 = Gabriele | last4 = Ebenhöch | first4 = Franz Ludwig | last5 = Kühborth | first5 = Brigitte | last6 = Silver | first6 = Jack | last7 = Rituper | first7 = Rafael }}
It can also be made from the insoluble, olive green, Iron(II) carbonate.{{Citation needed|date=July 2020}}
It adopts a polymeric structure with octahedral Fe(II) centers interconnected by acetate ligands. It is a coordination polymer.
Uses
Ferrous acetate is used as a mordant by the dye industry. Ebonizing wood is one such process.[http://www.wwgoa.com/ebonizing-wood/ Ebonizing Wood with Ferric Acetate]