[(Pyridine-2,6-dicarboxyl-ato)copper(II)]-μ-(pyridine-2,6-dicarboxyl-ato)-[bis-(ethyl-enediamine)-copper(II)]-μ-(pyridine-2,6-dicarboxyl-ato)-[(pyridine-2,6-dicarboxyl-ato)copper(II)] ethyl-enediamine monosolvate tetra-hydrate.

The title compound, [Cu(3)(C(7)H(3)NO(4))(4)(C(2)H(8)N(2))(2)]·C(2)H(8)N(2)·4H(2)O, was obtained by the reaction of copper(II) acetate dihydrate with pyridine-2,6-dicarb-oxy-lic acid (H(2)dipic) and ethyl-enediamine (en) in an aqueous solution. All of the Cu(II) atoms in the trinuclear centrosymmetric title complex are six-coordinated in a distorted octa-hedral geometry with N(2)O(4) and N(4)O(2) environments for the outer and central Cu(II) atoms, respectively. Various inter-actions, including numerous O-H⋯O and C-H⋯O hydrogen bonds and C-O⋯π stacking of the pyridine and carboxyl-ate groups [O⋯centroid distances = 3.669†(2) and 3.668†(2)†à ] are observed in the crystal structure.