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The title compound, [Cu 2 (C 2 O 4 ) 2 (C 3 H 4 N 2 ) 2 ]  n  , was obtained as an unexpected product under hydro­thermal conditions. The Cu II  atom is in a Jahn–Teller-distorted octa­hedral environment formed by one imidazole N atom and five O atoms from three oxalate anions. The two independent oxalate anions are situated on centres of inversion and coordinate to the Cu II  atom in two different modes,  viz . bidentate and monodentate. The bidentate anions bridge two Cu II  atoms, whereas the monodentate anions bridge four Cu II  atoms, leading to a layered arrangement parallel to (100). These layers are further linked into a final three-dimensional network structure  via  inter­molecular N—H⋯O hydrogen bonds. The title compound is isotypic with the Zn analogue.

Poly[diimidazole-μ4-oxalato-μ2-oxalato-dicopper(II)]

Poly[diimidazole-μ₄-oxalato-μ₂-oxalato-dicopper(II)]