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Lithium trioxalatoferrate (III)

From Crystal growing


   Lithium trioxalatoferrate(III)   
Names: lithium ferrioxalate
lithium oxalatoferrate(III)
lithium trioxalatoferrate(III)
lithium trioxalatoferriate
lithium tris(oxalato)ferrate(III)
lithium tris(oxalato)ferriate
Formula: Li3[Fe(C2O4)3] (anhydrous)
Li3[Fe(C2O4)3] · 5H2O (pentahydrate)
Molar mass: 340.722 g/mol (anhydrous)
430.796 g/mol (pentahydrate)
Shapes:
https://en.crystalls.info/w/uploads/media/b/bc/Rhombic_prism.json
https://en.crystalls.info/w/uploads/media/3/36/Oblique_rhombic_prism.json
https://en.crystalls.info/w/uploads/media/0/0e/Truncated_rhombic_bipyramid.json
https://en.crystalls.info/w/uploads/media/f/fd/Beveled_truncated_rhombic_prism.json

Color: green
Stability: stable (pentahydrate)

Description

Organic coordination complex, salt of transitional metal iron, alkaline metal lithium and organic oxalic acid. From water solutions crystallizes as pentahydrate.

Chemical equation:

Fe2O3 + 6LiOH + 6H2C2O4 = 2Li3[Fe(C2O4)3] + 9H2O
Fe2O3 + 3Li2CO3 + 6H2C2O4 = 2Li3[Fe(C2O4)3] + 6H2O + 3CO2
Fe(OH)3 + 3LiOH + 3H2C2O4 = Li3[Fe(C2O4)3] + 6H2O
2Fe(OH)3 + 3Li2CO3 + 6H2C2O4 = 2Li3[Fe(C2O4)3] + 9H2O + 3CO2


For preparation of 100.00g of lithium trioxalatoferrate(III) pentahydrate а 18.53g of iron(III) oxide or 24.81g of iron(III) hydroxide, 16.68g of lithium hydroxide or 25.73g of lithium carbonate and 87.79g of oxalic acid dihydrate is required.

Add acid to the flask, then add small parts of iron compound with stirring until it will totally dissolve .Add acid to the flask, then add small parts of lithium compound with stirring until it will totally dissolve or, if you use carbonate, until carbon dioxide emission will stop. After reaction will stop, filter the solution and use it for crystal growing.

Chemical equation:

Fe2O3 + 6LiHC2O4 = 2Li3[Fe(C2O4)3] + 3H2O
Fe(OH)3 + 3LiHC2O4 = Li3[Fe(C2O4)3] + 3H2O


For preparation of 100.00g of lithium trioxalatoferrate(III) pentahydrate а 18.53g of iron(III) oxide or 24.81g of iron(III) hydroxide and 79.38g of lithium hydrooxalate monohydrate is required.

Add to the flask with iron(III) compounds solution a hot lithium hydrooxalate solution with stirring. After reaction will stop, filter the solution and use it for crystal growing.

Chemical equation:

Fe2O3 + 3Li2C2O4 + 3H2C2O4 = 2Li3[Fe(C2O4)3] + 3H2O
2Fe(OH)3 + 3Li2C2O4 + 3H2C2O4 = 2Li3[Fe(C2O4)3] + 6H2O


For preparation of 100.00g of lithium trioxalatoferrate(III) pentahydrate а 18.53g of iron(III) oxide or 24.81g of iron(III) hydroxide, 35.48g of lithium oxalate and 43.89g of oxalic acid dihydrate is required.

Add to the flask with iron(III) compounds solution a hot lithium oxalate and oxalic acid solution with stirring. After reaction will stop, filter the solution and use it for crystal growing.

Notes

Direct sunlight or other sources of ultravioler radiation lead to solution changing color from green to yellow, and also lead crystals to shatter. So solution and crystals should be stored in dark place.

Keep in its original form or under several layers of varnish at average humidity and room temperature. Do not keep crystals near heaters.

Temperatureg/100,00 g water
20°C293.15 K <br />68 °F <br />527.67 °R <br />~92



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