catena-Poly[[tetra­aqua­zinc(II)]-μ-2,2′-dihydr­oxy-5,5′-diazenediyldibenzoato]

In the title compound, [Zn(C(14)H(8)N(2)O(6))(H(2)O)(4)](n), the 2,2′-dihydr­oxy-5,5′-diazenediyldibenzoate ligand acts as a carboxyl­ate bridge, leading to the formation of a polymeric chain running along the [1[Image: see text]0] direction. The Zn(II) atom is hexa-coordinated in a distorted octa­hedral geometry by six O atoms [Zn—O = 2.055 (4)–2.132 (3) Å] from two carboxylate ligands and four water mol­ecules. The crystal packing is stabilized by inter­molecular O—H⋯O, O—H⋯N and C—H⋯O hydrogen bonds, and two π–π inter­actions. The centroid–centroid distances are 3.803 (16) and 3.804 (17) Å.