Potassium ferrioxalate

Potassium ferrioxalate
Names
	IUPAC name Potassium iron(III) oxalate
	Other names potassium ferrioxalate; potassium trisoxalatoferrate(III)
Identifiers
CAS Number	14883-34-2 ; 5936-11-8 (trihydrate) ;
3D model (JSmol)	Interactive image;
ChemSpider	8108406;
ECHA InfoCard	100.035.398
EC Number	238-954-7;
PubChem CID	24180941;
RTECS number	SZ3500000;
UNII	BV5XLR9R4O;
UN number	3077
	InChI InChI=1S/3C2H2O4.Fe.K/c33-1(4)2(5)6;;/h3(H,3,4)(H,5,6);;/q;;;+3;+1/p-2 Key: VSRUWRBJHJVUDC-UHFFFAOYSA-L;
	SMILES O=C(C(=O)[O-]1)[O-][Fe+3]123([O-]C(C(=O)[O-]2)=O)[O-]C(C(=O)[O-]3)=O.[K+].[K+].[K+];
Properties
Chemical formula	K3[Fe(C2O4)3] (anhydrous); K3[Fe(C2O4)3]·3H2O (trihydrate)
Molar mass	437.20 g/mol (anhydrous); 491.25 g/mol (trihydrate)
Appearance	emerald green crystals
Density	2.13 g/cm3
Melting point	230 °C (446 °F; 503 K) the trihydrate loses 3H2O at 113 °C
Structure
Coordination geometry	octahedral
Dipole moment	0 D
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Corrosive. Eye, respiratory and skin irritant.
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H312
Precautionary statements	P280, P301+P330+P331, P302+P353, P312, P330, P363, P403, P501
Related compounds
Other anions	Sodium ferrioxalate
Related compounds	Iron(II) oxalate; Iron(III) oxalate
	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

Potassium ferrioxalate, also called potassium trisoxalatoferrate or potassium tris(oxalato)ferrate(III) is a chemical compound with the formula K₃[Fe(C₂O₄)₃]. It often occurs as the trihydrate K₃[Fe(C₂O₄)₃]·3H₂O. Both are crystalline compounds, lime green in colour.

The compound is a salt consisting of ferrioxalate anions, [Fe(C₂O₄)₃]³⁻, and potassium cations K⁺. The anion is a transition metal oxalate complex consisting of an iron atom in the +3 oxidation state and three bidentate oxalate C₂O2−4 ligands. Potassium is a counterion, balancing the −3 charge of the complex. In solution, the salt dissociates to give the ferrioxalate anion, [Fe(C₂O₄)₃]³⁻, which appears fluorescent green in color. The salt is available in anhydrous form as well as a trihydrate.

The ferrioxalate anion is quite stable in the dark, but it is decomposed by light and high-energy electromagnetic radiation.

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