Potassium ferrioxalate

Potassium ferrioxalate
Lime green crystals of potassium ferrioxalate trihydrate
Potassium ferrioxalate
Names
IUPAC name
Potassium iron(III) oxalate
Other names
potassium ferrioxalate
potassium trisoxalatoferrate(III)
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.035.398 Edit this at Wikidata
EC Number
  • 238-954-7
RTECS number
  • SZ3500000
UNII
UN number 3077
  • InChI=1S/3C2H2O4.Fe.K/c3*3-1(4)2(5)6;;/h3*(H,3,4)(H,5,6);;/q;;;+3;+1/p-2
    Key: VSRUWRBJHJVUDC-UHFFFAOYSA-L
  • 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
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[1]
Structure
octahedral
0 D
Hazards[2]
Occupational safety and health (OHS/OSH):
Main hazards
 Corrosive. Eye, respiratory and skin irritant.
GHS labelling:
GHS07: Exclamation mark
Warning
H302, H312
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).
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Potassium ferrioxalate, also called potassium trisoxalatoferrate or potassium tris(oxalato)ferrate(III)[3] 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.[4]

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[3] as well as a trihydrate.[5]

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

  1. ^ Cite error: The named reference ladr was invoked but never defined (see the help page).
  2. ^ "5936-11-8 - Potassium trioxalatoferrate(III) trihydrate - Potassium iron(III) oxalate - 31124 - Alfa Aesar". www.alfa.com.
  3. ^ a b A. Saritha, B. Raju, M. Ramachary, P. Raghavaiah, and K. A. Hussain (2012) "Synthesis, Crystal Structure and Characterization of Chiral, Three-Dimensional Anhydrous Potassium Tris(oxalato)ferrate(III)", Physica B: Condensed Matter, volume 407, issue 21, pages 4208-4213. doi:10.1016/j.physb.2012.07.005
  4. ^ Cite error: The named reference JCB was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Junk was invoked but never defined (see the help page).