catena-Poly[[tetra-μ-benzoato-κ(8) O:O′-dicopper(II)]-μ-[N-(pyridin-4-yl)nicotin­amide]-κ(2) N:N′-[dibenzoato-κ(2) O-copper(II)]-μ-[N-(pyridin-4-yl)nicotin­amide]-κ(2) N:N′]

In the polymeric title compound, [Cu(3)(C(7)H(5)O(2))(6)(C(11)H(9)N(3)O)(2)](n), square-planar-coordinated Cu(II) ions on crystallographic inversion centres are bound by two monodentate benzoate anions. The resulting [Cu(benzoate)](2) fragments are joined to centrosymmetic [Cu(2)(benzoate)(4)] paddlewheel clusters [Cu⋯Cu = 2.6331 (5) Å] by means of bridging N-(pyridin-4-yl)nicotinamide (4-pna) ligands [dihedral angle between the aromatic rings = 39.18 (12)°], thereby forming [Cu(3)(benzoate)(6)(4-pna)(2)](n) coordination-polymer chains that are arranged parallel to the [30-1] crystal direction. These polymeric chains are anchored into supra­molecular layers by N—H⋯O hydrogen bonding between neighboring 4-pna ligands. These layers aggregate by crystal packing forces to afford the crystal structure of the title compound.