[N-(2-Hydroxy-ethyl)ethyl-enediamine]oxalatocopper(II).

In the title mononuclear copper(II) compound, [Cu(C(2)O(4))(C(4)H(12)N(2)O)], the Cu(II) ion has a slightly distorted square-pyramidal geometry, with a tridentate N-(2-hydroxy-ethyl)ethyl-enediamine (HydEt-en) and a bidentate oxalate (ox) ligand. The N atoms of the HydEt-en ligand and the O atoms of ox ligand form the basal plane, while the O atom of the ethanol group of the HydEt-en ligand is located in the axial position. The complex mol-ecules participate in a supra-molecular assembly through N-H⋯O and O-H⋯O hydrogen bonds between HydEt-en and ox ligands.