High Quality Content by WIKIPEDIA articles! Sodium ferrioxalate, also known as sodium oxalatoferrate, is a chemical compound with the formula Na3[Fe(C2O4)3], where iron is in the +3 oxidation state. It is an octahedral transition metal complex in which three bidentate oxalate ions act as ligands bound to an iron centre. Sodium acts as a counterion, balancing the -3 charge of the complex. Crystals of the hydrated form of the complex, Na3[Fe(C2O4)x].xH2O, are lime green in colour. In solution the complex dissociates to give the ferrioxalate anion, [Fe(C2O4)3]3-, which appears a deep apple green in colour.

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