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There are two half-mol­ecules 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 mol­ecule. In both mol­ecules, the central Cu atom (site symmetry) adopts a distorted  trans -CuO 2 N 4  octa­hedral geometry, arising from its coordination by two  N , O -bidentate aroylhydrazine ligands and two pyridine mol­ecules. The peripheral Cu atoms adopt  trans -CuN 2 O 2  square-planar coordinations arising from an  N , O , O -tri­dentate ligand (that also bonds to the central Cu atom) and a pyridine mol­ecule.

Bis[μ-N′-acetyl-1-oxidonaphthalene-2-carbohydrazidato(3−)]tetrapyridinetricopper(II)