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POTASSIUM FERRIC OXALATE

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POTASSIUM FERRIC OXALATE Basic information
POTASSIUM FERRIC OXALATE Usage And Synthesis
  • DescriptionPotassium ferri oxalate , is a chemical compound with the formula K3[Fe(C2O4)3], where iron is in the +3 oxidation state. It is an octahedral transition metal complex in which three bidentate oxalate ions are bound to an iron center. Potassium acts as a counterion, balancing the -3 charge of the complex. Crystals of the trihydrated form of the complex, K3[Fe(C2O4)3]·3H2O, are emerald green in color. In solution, the salt ionizes to give the ferrioxalate anion, [Fe(C2O4)3]3- , which appears fluorescent green in color. Potassium ferrioxalate is often used in chemical actinometry.
  • Chemical PropertiesMonoclinic green crystals. Loses 3H 2 O at 100C, decomposes at 230C. Soluble in water and acetic acid; incompatible with alkali and ammonia, since these react to precipitate ferric hydroxide.
  • CharacteristicsThe ferrioxalate complex exhibits optical activity since there are two non-superimposable stereoisomers of the complex. In accordance with the IUPAC convention, the isomer with the left-handed screw axis is assigned the Greek symbol Λ (lambda). Its mirror image with the right-handed screw axis is given the Greek symbol Δ (delta).
  • UsesPhotography and blueprinting.
  • PreparationThe complex can be synthesized from the reaction between iron (III) sulfate, barium oxalate and potassium oxalate :
    Fe2(SO4)3 + 3 BaC2O4 + 3 K2C2O4
    2K3[Fe(C2O4)3] + 3BaSO4
    The reactants are dissolved in water and heated for around 1.5 hours. BaSO4 precipitates out leaving behind the newly formed complex in solution. The complex can then be obtained by filtering off the BaSO4 and cooling the solution so that it crystallizes out.
  • ReactionsIn solution, the ferrioxalate complex undergoes photoreduction. In this process, the complex absorbs a photon of light and subsequently decomposes to form Fe(C2O4)22- and CO2. The iron centre is reduced (gains an electron) from the +3 to the +2 oxidation state while an oxalate ion is oxidised to carbon dioxide :
    2 [Fe(C2O4)3]3- + hν → 2 [Fe(C2O4)2]2- + C2O4 2- + 2CO2.
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  • Company Name:3B Pharmachem (Wuhan) International Co.,Ltd.
  • Tel:18930552037 821-50328103-801
  • Email:3bsc@sina.com
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