Iron(II) oxalate

Names
IUPAC name

Iron(II) oxalate

Other names

Iron oxalate
Ferrous oxalate

Identifiers

CAS Number

* 516-03-0 Y
* 6047-25-2 (dihydrate) Y

3D model (JSmol)

* Interactive image

EC Number |

* 208-217-4

PubChem CID

* 10589

UNII |

* DZP4YV3ICV Y
* Z6X3YBU50D (dihydrate) Y

InChI

* InChI=1S/3C2H2O4.2Fe/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;2*+3/p-6 N

Key: VEPSWGHMGZQCIN-UHFFFAOYSA-H N

SMILES

* [Fe+2].O=C([O-])-C([O-])=O

Properties

Chemical formula

| FeC2O4 (anhydrous)
FeC2O4 • 2H2O (dihydrate)
Molar mass | 143.86 g/mol (anhydrous)
179.89 g/mol (dihydrate)
Appearance  | yellow powder
Odor | odorless
Density | 2.28 g/cm3
Melting point |  dihydrate: 150–160 °C (302–320 °F; 423–433 K)
(decomposes)

Solubility in water

| dihydrate:
0.097 g/100ml (25 °C)[1]
Hazards
GHS pictograms | [2]
GHS Signal word | Warning

GHS hazard statements

| H302, H312[2]

GHS precautionary statements

| P280[2]

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

Ferrous oxalate (iron(II) oxalate) are inorganic compound with the formula FeC2O4(H2O)x where x is 0 or 2. These are orange compounds, poorly soluble in water. Thyy

## Contents

* 1 Structure and reactions
* 2 Natural occurrence
* 3 See also
* 4 References

## Structure and reactions

Like other iron oxalates, ferrous oxalates feature octahedral Fe centers. The dihydrate FeC2O4(H2O)x is a coordination polymer, consisting of chains of oxalate-bridged ferrous centers, each with two aquo ligands.[3]

When heated to 120 °C, the dihydrate dehydrates, and the anhydrous ferrous oxalate decomposes near 190 °C.[4] The products of thermal decomposition is a mixture of iron oxides and pyrophoric iron metal, as well as released carbon dioxide, carbon monoxide, and water.[5]

Ferrous oxalates are precursors to iron phosphates, which are of value in batteries.[6]

## Natural occurrence

Anhydrous iron(II) oxalate is unknown among minerals as of 2020. However, the dihydrate is known as humboldtine.[7][8] A related, though much more complex mineral is stepanovite,
Na[Mg(H2O)6] [Fe3+(C2O4)3]·3H2O - an example of trioxalatoferrate(III).[9][8]

## See also

* Iron(III) oxalate
* Potassium ferrioxalate
* Sodium ferrioxalate

## References

1. ↑ "Iron(II) oxalate dihydrate". http://chemister.ru/Database/properties-en.php?dbid=1&id=2084.
2. ↑ 2.0 2.1 2.2 Sigma-Aldrich Co., Iron(II) oxalate dihydrate. Retrieved on 2014-05-03.
3. ↑ Echigo, Takuya; Kimata, Mitsuyoshi (2008). "Single-crystal X-ray diffraction and spectroscopic studies on humboldtine and lindbergite: weak Jahn–Teller effect of Fe2+ ion". Physics and Chemistry of Minerals 35 (8): 467–475. doi:10.1007/s00269-008-0241-7. Bibcode: 2008PCM....35..467E.
4. ↑ Mu, Jacob; Perlmutter, D.D. (1981). "Thermal decomposition of carbonates, carboxylates, oxalates, acetates, formates, and hydroxides". Thermochimica Acta 49 (2–3): 207–218. doi:10.1016/0040-6031(81)80175-x.
5. ↑ Hermanek, Martin; Zboril, Radek; Mashlan, Miroslav; Machala, Libor; Schneeweiss, Oldrich (2006). "Thermal Behaviour of Iron(II) Oxalate Dihydrate in the Atmosphere of Its Conversion Gases". J. Mater. Chem. 16 (13): 1273–1280. doi:10.1039/b514565a.
6. ↑ Ellis, B. L.; Makahnouk, W. R. M.; Makimura, Y.; Toghill, K.; Nazar, L. F. (2007). "A multifunctional 3.5 V iron-based phosphate cathode for rechargeable batteries". Nature Materials 6 (10): 749–753. doi:10.1038/nmat2007. PMID 17828278. Bibcode: 2007NatMa...6..749E.
7. ↑ "Humboldtine". https://www.mindat.org/min-1946.html.
8. ↑ 8.0 8.1 "List of Minerals". 21 March 2011. https://www.ima-mineralogy.org/Minlist.htm.
9. ↑ "Stepanovite". https://www.mindat.org/min-3763.html.

* v
* t
* e

Iron compounds

Fe(-II)|

* Na2Fe(CO)4

Fe(0)|

* Fe(CO)5
* Fe2(CO)9
* Fe3(CO)12
* Fe(CO)3CH3COC2H2C6H6

Fe(I)|

* FeH

| Organoiron(I) compounds|

* (C5H5FeCO)2(CO)2

|

Fe(0,II)|

* Fe3C

Fe(II)|

* FeBr2
* FeCl2
* FeF2
* FeI2
* FeH2
* FeMoO4
* FeO
* Fe(OH)2
* FeS
* FeSO4
* FeSe
* FeSeO4
* FeSi2
* FeTiO3
* FeCO3
* FeC2O4
* Fe(C2H3O2)2
* Fe(C3H5O3)2
* FeC6H6O7
* FeC12H22O14
* Fe2CrO4
* Fe3(PO4)2
* H2Fe(CO)4
* Fe(HCO3)2
* Mg2FeH6

| Organoiron(II) compounds|

* Fe(C5H5)2
* Fe(C5H4P(C6H5)2)2
* C4H4Fe(CO)3
* C4H6Fe(CO)3

|

Fe(0,III)|

* Fe3P

Fe(II,III)|

* Fe3O4
* Fe3S4

Fe(III)|

* FeBr3
* FeCl3
* FeF3
* FeI3
* Fe(NO3)3
* Fe(acac)3
* FeOCl
* FeO(OH)
* FePO4
* Fe4(P2O7)3
* Fe2(CrO4)3
* Fe2(C2O4)3
* Fe2O3
* Fe2S3
* Fe2(SO4)3
* FeBO3
* FeB

| Organoiron(III) compounds|

* Fe(C5H5)2BF4
* C6H8O7⋅xFe3+⋅yNH3

|

Fe(VI)|

* K2FeO4
* BaFeO4

* v
* t
* e

Oxalates

* (NH4)2C2O4
* BaC2O4
* CaC2O4
* Ce2(C2O4)3
* CrC2O4
* CoC2O4
* CuC2O4
* FeC2O4
* Fe2(C2O4)3
* PbC2O4
* MgC2O4
* Ag2C2O4
* Na2C2O4
* SrC2O4
* Th(C2O4)2

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*[H302]: Harmful if swallowed
*[H312]: Harmful in contact with skin
*[P280]: Wear protective gloves/protective clothing/eye protection/face protection
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