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The title compound [Cu 2 (C 6 H 3 BrNO 2 ) 4 ]  n  , forms sheets in the  bc  plane. The structure features the dinuclear paddle-wheel cage motif common to copper(II) carboxyl­ates. The polymeric structure is achieved through bridging between binuclear units by the pyridyl donors of two of the four carboxyl­ates of the cage. Each cage engages in axial bonding at each copper atom to a pyridyl nitro­gen donor and extends two 5-bromo­pyridine-3-carboxyl­ate groups to bridge to adjacent binuclear sites in the  bc  plane. Each cage is linked to four adjacent cages in the plane. The intra­dimer Cu⋯Cu distance is 2.6465 (5) Å. The remaining 5-bromo­pyridine-3-carboxyl­ate groups project into the inter­lamellar domain and inter­digitate in pairs from each neighboring layer.

acta crystallographica. section e

catena-Poly[[bis(μ-5-bromopyridine-3-carboxylato-κ2O:O′)dicopper(II)]-bis(μ-5-bromopyridine-3-carboxylato)-κ3O,O′:N;κ3N:O,O′]