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In the crystal structure of the title polymeric compound, [Cu(C12H12O4)(C10H8N2)]n, the asymmetric unit consists of one CuII ion, one 5-tert-butylisophthalate (tbip) and one 2,2′-bipyridine (bpy) ligand. The copper(II) ion is four-coordinated by two N atoms from bipy and two O atoms from two tbip ligands, leading to a distorted tetrahedral coordination. Each tbip ligand adopts a bis-monodentate coordination mode to connect two symmetry-related copper(II) ions, so forming a zigzag polymer chain parallel to [001]. The tert-butyl methyl groups are disordered over two positions with occupancies of 0.506 (6)/0.494 (6)