Anion...[pi] inter­actions in copper(I) chloride and bromide coordination polymers bearing 1,4-bis(pyridazin-4-yl)benzene ligands

The title chloride and bromide coordination polymers are isomorphous and the primary coordination motif consists of cuprohalogenide chains accommodating [mu]-pyridazine groups. The organic ligands are tetra­dentate and link the inorganic chains into corrugated layers. The packing is influenced by inter­layer anion...[pi] inter­actions.