Tag: oxalate

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: Li₄[Fe(C₂O₄)₃]Cl·9H₂O

Double salt of lithium with two different anions: ferrioxalate [Fe(C₂O₄)₃]^3- and chlorice Cl^-. Also known as tetralithium iron(III) trioxalate chloride nonahydrate.

Lithium ferrioxalate alone forms tabular crystals, but when lithium chloride is added, they crystallize together, orming new structure.

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Formula: Na₃[Al(C₂O₄)₃]·5H₂O

Also known as sodium alumooxalate or sodium oxalatoaluminate. Similar compounds:

• Potassium analog that have different structure: potassium tris(oxalato) aluminate.
• Iron analog, with the same structure and nice green color: sodium tris(oxalato) ferrate(III).

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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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Formula: (NH₃CH₂COOH)₂C₂O₄

Oxalic acid H₂C₂O₄ is among the strongest inorganic acids, and can easily form salts with many weak bases such as amino-acid glycine. When one mole of oxalic acid is crystallized together with 2 moles of glycine, transparent sticks of glycine oxalate grows.

Different names: diglycine oxalate, glycinium oxalate.

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