Bis[μ-N'-acetyl-1-oxidonaphthalene-2-carbohydrazidato(3-)]tetra-pyridine-tricopper(II).

There are two half-mol-ecules in the asymmetric unit of the title compound, [Cu(3)(C(13)H(9)N(2)O(3))(2)(C(5)H(5)N)(4)], and crystallographic inversion symmetry completes each trinuclear mol-ecule. In both mol-ecules, the central Cu atom (site symmetry ) adopts a distorted trans-CuO(2)N(4) octa-hedral geometry, arising from its coordination by two N,O-bidentate aroylhydrazine ligands and two pyridine mol-ecules. The peripheral Cu atoms adopt trans-CuN(2)O(2) square-planar coordinations arising from an N,O,O-tri-dentate ligand (that also bonds to the central Cu atom) and a pyridine mol-ecule.