Poly[chlorido[μ4-2,2′-(2-methyl-1H-benzimidazol-3-ium-1,3-di­yl)diacetato]­zinc]

The title compound, [Zn(C12H11N2O4)Cl]n, contains a centrosymmetric dimetal tetra­carboxyl­ate paddle-wheel moiety in which the ZnII atom is square-pyramidally coordinated by four carboxyl­ate O atoms at the basal positions and one Cl− anion at the apical position. Each paddle-wheel unit is joined to four such neighbours through bridging dicarboxyl­ate ligands, producing a two-dimensional undulating layer parallel to (-101). Adjacent sheets are stacked in a parallel fashion to form a three-dimensional supra­molecular structure which is stabilized by inter­layer π–π inter­actions between benzene rings, with a centroid–centroid distance of 3.722 A. The range of Zn—O bond lengths is 2.0440 (17)–2.1256 (15) A and the Zn—Cl bond length is 2.2622 (6) A.