| Revision as of 06:49, 24 January 2011 editCheMoBot (talk | contribs)Bots141,565 edits Updating {{chembox}} (no changed fields - added verified revid - updated 'UNII_Ref', 'ChemSpiderID_Ref', 'StdInChI_Ref', 'StdInChIKey_Ref', 'ChEMBL_Ref', 'KEGG_Ref') per Chem/Drugbox validation (← Previous edit |
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| verifiedrevid = 407440566 |
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|ImageFile1=Iron(II)-oxalate-sample.jpg |
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|verifiedrevid = 409714131 |
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|ImageFile2=Fe(C2O4)-2D-ionic.png |
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|ImageFile1 = Iron(II)-oxalate-sample.jpg |
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|IUPACName= |
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|ImageFile2 = Fe(C2O4)-2D-ionic.png |
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|OtherNames=Iron oxalate |
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|IUPACName = Iron(II) oxalate |
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|Section1= {{Chembox Identifiers |
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|OtherNames = Iron oxalate<br> Ferrous oxalate |
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| CASNo=516-03-0 |
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|Section1={{Chembox Identifiers |
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| PubChem=22197 |
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|CASNo1_Ref = {{cascite|correct|CAS}} |
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|CASNo1 = 516-03-0 |
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|CASNo2_Ref = {{cascite|correct|CAS}} |
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|Section2= {{Chembox Properties |
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|CASNo2 = 6047-25-2 |
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| Formula=FeC<sub>2</sub>O<sub>4</sub> |
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|CASNo2_Comment = (dihydrate) |
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| MolarMass=143.91 g/mol |
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|UNII1_Ref = {{fdacite|correct|FDA}} |
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| Appearance= yellow powder |
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|UNII1 = DZP4YV3ICV |
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|UNII2_Ref = {{fdacite|correct|FDA}} |
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|UNII2 = Z6X3YBU50D |
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|UNII2_Comment = (dihydrate) |
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| Solubility= |
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|PubChem =10589 |
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}} |
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|EINECS = 208-217-4 |
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|Section3= {{Chembox Hazards |
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|SMILES = .O=C()-C()=O |
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|StdInChI_Ref = {{stdinchicite|changed|chemspider}} |
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|StdInChI = 1S/3C2H2O4.2Fe/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;2*+3/p-6 |
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|StdInChIKey_Ref = {{stdinchicite|changed|chemspider}} |
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|StdInChIKey = VEPSWGHMGZQCIN-UHFFFAOYSA-H |
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|Section2={{Chembox Properties |
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|Formula = FeC<sub>2</sub>O<sub>4</sub> (anhydrous)<br> FeC<sub>2</sub>O<sub>4</sub>{{hydrate|2}} (dihydrate) |
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|MolarMass = 143.86 g/mol (anhydrous)<br> 179.89 g/mol (dihydrate) |
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|Appearance = yellow powder |
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|Odor = odorless |
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|Density = 2.28 g/cm<sup>3</sup> |
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|MeltingPt = |
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|MeltingPt_notes = dihydrate: {{convert|150-160|C|F K}}<br> (decomposes) |
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|BoilingPtC = |
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|Solubility = dihydrate:<br> 0.097 g/100ml (25 °C)<ref>{{Cite web|url=http://chemister.ru/Database/properties-en.php?dbid=1&id=2084|title = Iron(II) oxalate dihydrate}}</ref> |
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|Section3={{Chembox Hazards |
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|GHSPictograms = {{GHS07}}<ref name="sigma">{{Sigma-Aldrich|id=255971|name=Iron(II) oxalate dihydrate|accessdate=2014-05-03}}</ref> |
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|GHSSignalWord = Warning |
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|HPhrases = {{H-phrases|302|312}}<ref name="sigma" /> |
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|PPhrases = {{P-phrases|280}}<ref name="sigma" /> |
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'''Ferrous oxalate''', or '''iron(II) oxalate''', is a chemical compound consisting of one iron(II) ion (Fe<sup>2+</sup>) and one oxalate ion (C<sub>2</sub>O<sub>4</sub><sup>2−</sup>). It has the ] Fe. |
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'''Ferrous oxalate''' ('''iron(II) oxalate''') are ] with the formula FeC<sub>2</sub>O<sub>4</sub>(H<sub>2</sub>O)<sub>x</sub> where x is 0 or 2. These are orange compounds, poorly soluble in water. |
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==Structure and reactions== |
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Iron(II) oxalate is more commonly encountered as the dihydrate, Fe·2H<sub>2</sub>O, CAS # 6047-25-2. Its crystal structure consists of chains of oxalate-bridged iron atoms, capped by water molecules.<ref>{{ cite journal | first1 = Takuya | last1 = Echigo | first2 = Mitsuyoshi | last2 = Kimata | title = Single-crystal X-ray diffraction and spectroscopic studies on humboldtine and lindbergite: weak Jahn–Teller effect of Fe<sup>2+</sup> ion | journal = ] | year = 2008 | volume = 35 | pages = 467–475 | doi = 10.1007/s00269-008-0241-7 }}</ref> |
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Like other iron oxalates, ferrous oxalates feature octahedral Fe centers. The dihydrate FeC<sub>2</sub>O<sub>4</sub>(H<sub>2</sub>O)<sub>x</sub> is a ], consisting of chains of oxalate-bridged ferrous centers, each with two aquo ligands.<ref>{{ cite journal |first1= Takuya |last1= Echigo |first2= Mitsuyoshi |last2= Kimata |title= Single-crystal X-ray diffraction and spectroscopic studies on humboldtine and lindbergite: weak Jahn–Teller effect of Fe<sup>2+</sup> ion |journal= ] |year= 2008 |volume= 35 |issue= 8 |pages= 467–475 |doi= 10.1007/s00269-008-0241-7 |bibcode= 2008PCM....35..467E |s2cid= 98739882}}</ref><br /> |
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When heated to 120 °C, the dihydrate dehydrates, and the anhydrous ferrous oxalate decomposes near 190 °C.<ref>{{cite journal |doi=10.1016/0040-6031(81)80175-x |title=Thermal decomposition of carbonates, carboxylates, oxalates, acetates, formates, and hydroxides |date=1981 |last1=Mu |first1=Jacob |last2=Perlmutter |first2=D.D. |journal=Thermochimica Acta |volume=49 |issue=2–3 |pages=207–218 }}</ref> The products of thermal decomposition is a mixture of iron oxides and ] iron metal, as well as released ], ], and water.<ref>{{cite journal |title= Thermal Behaviour of Iron(II) Oxalate Dihydrate in the Atmosphere of Its Conversion Gases |first1= Martin |last1=Hermanek |first2=Radek |last2=Zboril |first3=Miroslav |last3=Mashlan |first4=Libor |last4=Machala |first5=Oldrich |last5=Schneeweiss |journal= J. Mater. Chem. |date= 2006 |volume= 16 |issue= 13 |pages= 1273–1280|doi= 10.1039/b514565a}}</ref> |
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Ferrous oxalates are precursors to ]s, which are of value in batteries.<ref>{{cite journal |doi=10.1038/nmat2007 |title=A multifunctional 3.5 V iron-based phosphate cathode for rechargeable batteries |date=2007 |last1=Ellis |first1=B. L. |last2=Makahnouk |first2=W. R. M. |last3=Makimura |first3=Y. |last4=Toghill |first4=K. |last5=Nazar |first5=L. F. |journal=Nature Materials |volume=6 |issue=10 |pages=749–753 |pmid=17828278 |bibcode=2007NatMa...6..749E }}</ref> |
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==Natural occurrence== |
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Anhydrous iron(II) oxalate is unknown among minerals as of 2020. However, the dihydrate is known as ].<ref>{{Cite web|url=https://www.mindat.org/min-1946.html|title=Humboldtine}}</ref><ref name=IMA>{{Cite web|url=https://www.ima-mineralogy.org/Minlist.htm|title=List of Minerals|date=21 March 2011}}</ref> A related, though much more complex mineral is ],<br> |
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Na ·3H<sub>2</sub>O - an example of trioxalatoferrate(III).<ref>{{Cite web|url=https://www.mindat.org/min-3763.html|title=Stepanovite}}</ref><ref name=IMA>{{Cite web|url=https://www.ima-mineralogy.org/Minlist.htm|title=List of Minerals|date=21 March 2011}}</ref> |
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==See also== |
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* ] |
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* ] |
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* ] |
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==References== |
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==References== |
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{{Reflist}} |
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{{Reflist}} |
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{{Chem-stub}} |
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{{Iron compounds}} |
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{{Oxalates}} |
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] |
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