Crystal structure of poly[di­chlorido­(μ-2,5-di­carb­oxy­benzene-1,4-di­carboxyl­ato-κ(2) O (1):O (4))bis­[μ-4′-(pyridin-3-yl)-4,2′:6′,4′′-terpyridine-κ(2) N (1):N (4′)]dizinc]

In the title polymeric Zn(II) complex, [Zn(2)(C(10)H(4)O(8))Cl(2)(C(20)H(14)N(4))(2)](n), the Zn(II) cations are bridged by both 2,5-di­carb­oxy­benzene-1,4-di­carboxyl­ate dianions and 4′-(pyridin-3-yl)-4,2′:6′,4′′-terpyridine ligands, forming ladder-like polymeric chains propagating along [1-10]. The Cl(−) anion further coordinates the Zn(II) cation to complete a distorted tetra­hedral environment. In the 4′-(pyridin-3-yl)-4,2′:6′,4′′-terpyridine ligand, the three sideward pyridine rings are twisted with respect to the central pyridine ring by 39.27 (12), 14.89 (13) and 3.36 (13)°, respectively. In the crystal, classical O—H⋯N hydrogen bonds and weak C—H⋯O and C—H⋯Cl hydrogen bonds link the chains into a three-dimensional supra­molecular architecture. π–π stacking is observed between the pyridine and benzene rings of neighbouring polymeric chains, with a centroid-to-centroid distance of 3.7280 (14) Å.