Crystal structure of poly[di-chlorido-(μ-2,5-di-carb-oxy-benzene-1,4-di-carboxyl-ato-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, [Zn2(C10H4O8)Cl2(C20H14N4)2] n , the Zn(II) cations are bridged by both 2,5-di-carb-oxy-benzene-1,4-di-carboxyl-ate 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 tetra-hedral 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 supra-molecular 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.