catena-Poly[[diaquazinc(II)]-μ-trans-4,4′-diazenediyldibenzoato-κ4O,O′:O′′,O′′′]

The title compound, [Zn(C14H8N2O4)(H2O)2]n, consists of zigzag chains of Zn atoms bridged by azobenzene-4,4′-dicarboxylate ligands. The ZnII 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