catena-Poly[[tetra-aqua-zinc(II)]-µ-2,2'-dihydr-oxy-5,5'-diazenediyldibenzoato].

In the title compound, [Zn(C(14)H(8)N(2)O(6))(H(2)O)(4)](n), the 2,2'-dihydr-oxy-5,5'-diazenediyldibenzoate ligand acts as a carboxyl-ate bridge, leading to the formation of a polymeric chain running along the [10] direction. The Zn(II) atom is hexa-coordinated in a distorted octa-hedral geometry by six O atoms [Zn-O = 2.055 (4)-2.132 (3) Å] from two carboxylate ligands and four water mol-ecules. The crystal packing is stabilized by inter-molecular O-H⋯O, O-H⋯N and C-H⋯O hydrogen bonds, and two π-π inter-actions. The centroid-centroid distances are 3.803 (16) and 3.804 (17) Å.