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The title polymeric compound, [Cu 2 I 2 (C 8 H 7 N 3 ) 2 ]  n   [C 8 H 7 N 3  = 3-(1 H -imidazol-2-yl)pyridine (HIPy), where HIPy comes from the  in situ  deca­rboxylation of 2-(pyridin-3-yl)-1 H -imidazole-4,5-dicarb­oxy­lic acid (H 3 PyIDC)], was obtained under solvo­thermal conditions. Each Cu I  cation is in a distorted tetra­hedral coordination environment defined by two iodide anions and two nitro­gen atoms from two individual HIPy ligands. Two Cu I  atoms are connected by two HIPy ligands to form a dimer and these dimers are further bridged through the iodide atoms, leading to a chain structure extending parallel to [100]. Moreover, inter­molecular N—H⋯I hydrogen bonds and weak π–π stacking inter­actions [centroid⋯centroid distances of 3.809 (4) Å, an inter­planar separation of 3.345 (3) Å and a ring slippage of 1.822 Å] between pyridyl rings link the chains into a two-dimensional supra­molecular network in the  ac  plane.

catena-Poly[copper(I)-bis[μ-3-(1H-imidazol-2-yl)pyridine]-copper(I)-di-μ-iodido]