Potassium ferrooxalate
| Names | |
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| IUPAC name
Potassium iron(II) oxalate
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| Other names
potassium ferrooxalate
potassium bisoxalatoferrate(II) | |
| Identifiers | |
3D model (JSmol)
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| Properties | |
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| Molar mass | 310.078 g·mol−1 |
| Appearance |
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| Melting point | 470 °C (878 °F; 743 K)[1] decomposes |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
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Potassium ferrooxalate, also known as potassium bisoxalatoferrate(II), is a salt with the formula K2[Fe(C2O4)2]·xH2O. The anion is a transition metal oxalate complex, consisting of an atom of iron in the +2 oxidation state bound to oxalate (C2O2−4) ligands and water.[2]
Anhydrous K2Fe(C2O4)2 has been prepared by hydrothermal methods from ferrous chloride. It is a coordination polymer with trigonal prismatic Fe(C2O4)3 centers. Half of the oxalate ligands are bridging.[3]
Dihydrate
The material K2[Fe(C2O4)2]·2H2O has been claimed but not verified.[1] Potassium ferrooxalate is believed to be formed when the related compound potassium ferrioxalate K3[Fe(C2O4)3] is decomposed by light in solution (a common method of actinometry) or heated above 296 °C (565 °F).[1] The anhydrous salt is orange-yellow and dissolves in water to give a red solution. Crystals of the dihydrate K2[Fe(C2O4)2]·2H2O are golden yellow in color.[1]
See also
A number of other iron oxalates are known
References
- ^ a b c d e Ladriere, J. (April 1992). "Mössbauer study on the thermal decomposition of potassium tris (oxalato) ferrate(III) trihydrate and bis (oxalato) ferrate(II) dihydrate". Hyperfine Interactions. 70 (1–4): 1095–1098. doi:10.1007/BF02397520.
- ^ Amanchar, Sara; Schweitzer, Thierry; Mazet, Thomas; Malaman, Bernard; Diop, Leopold V. B.; Francois, Michel (2023). "Structure of the new iron(II) oxalate potassium salt K2Fe[(C2O4)2(H2O)2]·0.18H2O". Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials. 79 (4): 263–270. doi:10.1107/S2052520623004602. PMID 37347140. S2CID 259223071.
- ^ Hursthouse, Michael B.; Light, Mark E.; Price, Daniel J. (2004). "One-Dimensional Magnetism in Anhydrous Iron and Cobalt Ternary Oxalates with Rare Trigonal-Prismatic Metal Coordination Environment". Angewandte Chemie International Edition. 43 (4): 472–475. doi:10.1002/anie.200352406. PMID 14735538.