Poly[aqua­[μ₄-3,3′-(diazenediyl)dibenzo­ato]zinc]

The solvothermal reaction of Zn(OAc)₂·2H₂O with 3,3′-(di­az­enediyl)dibenzoic acid (H₂ADB) in H₂O at 393 K afforded the title complex, [Zn(C₁₄H₈N₂O₄)(H₂O)]_n. The asymmetric unit contains half a Zn^II cation, half an ADB ligand and half a water mol­ecule. Each Zn^II centre lies on a crystallographic twofold rotation axis and is five-coordinated by four O atoms of bridging carboxyl­ate groups from four ADB ligands and one O atom from a water mol­ecule, forming a distorted trigonal–bipyramidal coordination geometry. The [Zn(H₂O)] subunits are bridged by carboxyl­ate groups to give one-dimensional [Zn(μ-COO)₄(H₂O)]_n chains. The chains are linked by ADB ligands into two-dimensional sheets, and these sheets are further connected to neighbouring sheets via hydrogen bonds (OW—HW...O), forming a three-dimensional hydrogen-bond-stabilized structure with an unprecedented 3⁷4¹⁷5²6² topology.