[(Pyridine-2,6-dicarboxylato)copper(II)]-mu-(pyridine-2,6-dicarboxylato)-[ bis(ethylenediamine)copper(II)]-mu-(pyridine-2,6-dicarboxylato)-[( pyridine-2,6-dicarboxylato)copper(II)] ethylenediamine monosolvate tetrahydrate

The title compound, [Cu-3(C7H3NO4)(4)(C2H8N2)(2)]center dot C2H8N2 center dot 4H(2)O, was obtained by the reaction of copper(II) acetate dihydrate with pyridine-2,6-dicarboxylic acid (H(2)dipic) and ethylenediamine (en) in an aqueous solution. All of the Cu-II atoms in the trinuclear centrosymmetric title complex are six-coordinated in a distorted octahedral geometry with N2O4 and N4O2 environments for the outer and central Cu-II atoms, respectively. Various interactions, including numerous O-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds and C-O center dot center dot center dot pi stacking of the pyridine and carboxylate groups [O center dot center dot center dot centroid distances = 3.669 (2) and 3.668 (2) angstrom] are observed in the crystal structure.