| Names | |
|---|---|
| IUPAC name Potassium iron(II) oxalate | |
| Other names
potassium ferrooxalate potassium bisoxalatoferrate(II) | |
| Identifiers | |
| CAS Number | |
| 3D model (JSmol) | |
InChI
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SMILES
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| Properties | |
| Chemical formula | K 2 (anhydrous) K 2·2H 2O (dihydrate) |
| Appearance | orange-yellow solid (anhydrous), golden-yellow crystals (dihydrate) |
| Melting point | decomposes at 470 °C |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references | |
Potassium ferrooxalate, also known as potassium bisoxalatoferrate(II), is a salt with the formula K2Fe(C2O4)2(H2O)x. The anion is a transition metal oxalate complex, consisting of an atom of iron in the +2 oxidation state bound to oxalate (C
2O
4) ligands and water.
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.
Dihydrate
The material K2Fe(C2O4)2(H2O)2 has been claimed but not verified.Potassium ferrooxalate is believed to be formed when the related compound potassium ferrioxalate K
3 is decomposed by light in solution (a common method of actinometry) or heated above 296 °C. The anhydrous salt is orange-yellow and dissolves in water to give a red solution. Crystals of the dihydrate K
2·2H
2O are golden yellow in color.
See also
A number of other iron oxalates are known
References
- ^ J. Ladriere (1992): "Mössbauer study on the thermal decomposition of potassium tris (oxalato) ferrate(III) trihydrate and bis (oxalato) ferrate(II) dihydrate". Hyperfine Interactions, volume 70, issue 1, pages 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.
| Potassium compounds | |
|---|---|
| H, (pseudo)halogens | |
| chalcogens | |
| pnictogens | |
| B, C group | |
| transition metals | |
| organic | |
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