Cu2C2O4OH2

Copper(II) oxalate dihydrate, with the chemical formula Cu2C2O4OH2, is a chemical compound. It is a coordination complex involving copper ions and oxalate anions, with two water molecules incorporated into its crystal structure. This compound is generally encountered as a solid. Its appearance can vary depending on its purity and preparation method, but it is often described as a crystalline solid.

The structure of copper(II) oxalate dihydrate involves copper in the +2 oxidation state. The oxalate anion (C2O4^2-) acts as a bidentate ligand, coordinating to the copper ions. The presence of water molecules, indicated by the "2H2O" in the formula, signifies that it is a hydrated salt. These water molecules are typically coordinated to the metal ion or are present within the crystal lattice.

Copper(II) oxalate dihydrate has limited solubility in water. Like many copper compounds, it can exhibit characteristic colors, often in the blue or green spectrum. It may decompose upon heating, releasing water and potentially other decomposition products depending on the temperature and atmosphere. Its applications are not widespread, but it can be used in certain laboratory settings or as a precursor in the synthesis of other copper-containing materials.