Tag: ferrioxalate

Formula: K₅Na[Fe(C₂O₄)₃]₂

One of the most interesting crystals: a double salt of sodium, potassium and ferrioxalate ion that have deep green color, highly symmetric shape and great stability upon exposure to air. Unfortunately, I was not able to prepare aluminium analog: Na and K alumooxalates just crystallized separtely.

See also:

• Potassium tris(oxalato) ferrate (III): pure K salt
• Sodium tris(oxalato) ferrate (III): pure Na salt
• Sodium tris(oxalato) aluminate: Al analog

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Formula: Na₃[Fe(C₂O₄)₃]·3H₂O Other names are: sodium oxalatoferrate and sodium ferrioxalate.

Product of dissolving rust in oxalic acid (H₂C₂O₄) in presence of sodium oxalate. Surprisingly for an iron (III) compound, has bright green color. A well-known example of coordination complex.

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Formula: K₃[Fe(C₂O₄)₃]·3H₂O

Potassium salt of a complex acid, formed by Fe(III) and oxalate ions. As all ferrioxalates, has bright green color and is slightly light sensitve.

See also:

• Sodium tris(oxalato) ferrate (III): Na analog,
• Sodium Potassium tris(oxalato) ferrate (III): double salt of Na abd K with the same anion
• Sodium tris(oxalato) aluminate: Al analog

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Formula: Li₃[Fe(C₂O₄)]·5H₂O

Lithium salt of a complex acid, formed by Fe(III) and oxalate ions. As all ferrioxalates, has bright green color and is slightly light sensitve.

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