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Chemical compound
Copper(II) oxalate are inorganic compounds with the chemical formula . The value of x can be 0, 0.44, and 1. Two of these species are found as secondary minerals (degradation of minerals), whewellite (monohydrate) and moolooite (0.44 hydrate). The anhydrous compound has been characterized by X-ray crystallography. Many transition metal oxalate complexes are known.
Copper(II) monooxalates are practically insoluble in all solvents. They are coordination polymers.
Synthesis.
Copper(II) oxalate can be produced by precipitation from acidified aqueous copper(II) salts and oxalic acid.
Reactions.
Upon heating to 130 °C, the hydrated copper(II) oxalates convert to the anhydrous cupric oxalate. Further heating at higher temperatures under an atmosphere of hydrogen gives copper metal, suitable as a reagent.
The hydrates bind Lewis bases.
Hydrated copper(II) oxalate reacts with alkali metal oxalates and ammonium oxalate to give bis(oxalato)cuprate:
Uses.
Copper oxalate is used as a catalyst for organic reactions, as a stabilizer for acetylated polyformaldehyde.
References.
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