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In the title compound, [CoCl2(C13H14N2)]n, 1,3-bis(4-pyridyl)propane (bpp) ligands bridge four-coordinate Co atoms, generating an extended one-dimensional zigzag chain. Both the Co and two Cl atoms in the tetrahedral coordination polyhedron lie on a mirror plane, while the bbp ligand is bisected through the central C atom in the chain by a second mirror plane. There are some π–π stacking interations in the crystal structure, with interplanar distances of 3.449 Å, which are responsible for the supramolecular assembly.