Potassium ferrooxalate
| Names | |
|---|---|
| IUPAC name Potassium iron(II) oxalate | |
| Other names potassium ferrooxalate potassium bisoxalatoferrate(II) | |
| Identifiers | |
3D model (JSmol) | |
| |
| |
| Properties | |
| K 2[Fe(C 2O 4) 2] (anhydrous) K 2[Fe(C 2O 4) 2]·2H 2O (dihydrate) | |
| Appearance | orange-yellow solid (anhydrous), golden-yellow crystals (dihydrate) [1] |
| Melting point | decomposes at 470 °C [1] |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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
2O2−
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
[edit]The material K2Fe(C2O4)2(H2O)2 has been claimed[1] but not verified.Potassium ferrooxalate is believed to be formed when the related compound potassium ferrioxalate K
3[Fe(C
2O
4)
3] is decomposed by light in solution (a common method of actinometry) or heated above 296 °C.[1] The anhydrous salt is orange-yellow and dissolves in water to give a red solution. Crystals of the dihydrate K
2[Fe(C
2O
4)
2]·2H
2O are golden yellow in color.[1]
See also
[edit]A number of other iron oxalates are known
References
[edit]- ^ a b c d e 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.