catena-Poly[[diaquazinc(II)]-μ-trans-4,4′-diazenediyldibenzoato-κ(4) O,O′:O′′,O′′′]

The title compound, [Zn(C(14)H(8)N(2)O(4))(H(2)O)(2)](n), consists of zigzag chains of Zn atoms bridged by azobenzene-4,4′-dicarboxyl­ate ligands. The Zn(II) atom, lying on a twofold rotation axis, is coordinated by four O atoms from the carboxyl­ate groups and two water mol­ecules, giving rise to a considerably distorted octa­hedral coordination envionment. The ligand lies on an inversion center. In the crystal structure, π–π inter­actions between the ligands [inter­planar distance = 3.527 (3) Å] assemble the chains into a sheet-like structure. O—H⋯O hydrogen bonds between the coordinated water mol­ecules and carboxyl­ate O atoms connect the sheets into a three-dimensional network.