Iron(II)_oxalate Knowpia

Iron(II) oxalate
Names
	IUPAC name Iron(II) oxalate
	Other names Iron oxalate; Ferrous oxalate
Identifiers
CAS Number	516-03-0 ; 6047-25-2 (dihydrate) ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.007.472
EC Number	208-217-4;
PubChem CID	10589;
UNII	DZP4YV3ICV ; Z6X3YBU50D (dihydrate) ;
CompTox Dashboard (EPA)	DTXSID4060159 ;
	InChI InChI=1S/3C2H2O4.2Fe/c33-1(4)2(5)6;;/h3(H,3,4)(H,5,6);;/q;;;2*+3/p-6 Key: VEPSWGHMGZQCIN-UHFFFAOYSA-H ;
	SMILES [Fe+2].O=C([O-])-C([O-])=O;
Properties
Chemical formula	FeC2O4 (anhydrous); FeC2O4 · 2 H2O (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)
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H312
Precautionary statements	P280
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Ferrous oxalate (iron(II) oxalate) is an inorganic compound with the formula FeC₂O₄ · $x$ H₂O where $x$ is typically 2. These are orange compounds, poorly soluble in water.

Structure Edit

The dihydrate FeC₂O₄ · 2 H₂O is a coordination polymer, consisting of chains of oxalate-bridged ferrous centers, each with two aquo ligands.^[3]

When heated, it dehydrates and decomposes into a mixture of iron oxides and pyrophoric iron metal, with release of carbon dioxide, carbon monoxide, and water.^[4]

Natural occurrence Edit

Anhydrous iron(II) oxalate is as yet (2020) unknown among minerals. However, the dihydrate is known, as humboldtine.^[5]^[6] A related, though much more complex mineral is stepanovite,
Na[Mg(H₂O)₆] [Fe³⁺(C₂O₄)₃]·3H₂O - an example of trioxalatoferrate(III).^[7]^[6]

References Edit

^ "Iron(II) oxalate dihydrate".
^ ^a ^b ^c Sigma-Aldrich Co., Iron(II) oxalate dihydrate. Retrieved on 2014-05-03.
^ 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. Bibcode:2008PCM....35..467E. doi:10.1007/s00269-008-0241-7. S2CID 98739882.
^ 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.
^ "Humboldtine".
^ ^a ^b "List of Minerals". 21 March 2011.
^ "Stepanovite".

[1] "Iron(II) oxalate dihydrate".

[sigma-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. Bibcode:2008PCM....35..467E. doi:10.1007/s00269-008-0241-7. S2CID 98739882.

[4] 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.

[5] "Humboldtine".

[IMA-6] "List of Minerals". 21 March 2011.

[7] "Stepanovite".

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Summary

Structure Edit

Natural occurrence Edit

See also Edit

References Edit

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
ECHA InfoCard	100.007.472
EC Number	208-217-4
PubChem CID	10589
UNII	DZP4YV3ICV^Y Z6X3YBU50D (dihydrate)^Y
CompTox Dashboard (EPA)	DTXSID4060159
InChI InChI=1S/3C2H2O4.2Fe/c33-1(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 · 2 H₂O (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 labelling:
Pictograms	^[2]
Signal word	Warning
Hazard statements	H302, H312^[2]
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