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Acta Cryst. (2006). E62, m1139-m1141 [ doi:10.1107/S1600536806014164 ]
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2-oxalato-dioxalatotetracopper(II) tetrahydrateAbstract: In the structure of the title compound, (NH4)8[Cu4(C2O4)8(H2O)2]·4H2O, isolated tetramers of [Cu(ox)2]2+ (ox is oxalate) are present. Each CuII ion coordinates to four O atoms in two oxalate ligands and to two more distant O atoms in a neighbouring oxalate ligand or a water molecule. An extensive hydrogen-bonding network connects the tetramers to two unique solvent water molecules and four ammonium ions.
Online 29 April 2006
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