Poly[[(μ-benzene-1,4-dicarboxyl­ato)bis­[μ-4-(1H-1,3,7,8-tetra­aza­cyclo­penta­[l]phenanthren-2-yl)benzoato]dizinc] tetra­hydrate]

In the title complex, [Zn2(C8H4O4)(C20H11N4O2)2]·4H2O, the ZnII atom is six-coordinated by two carboxyl­ate O atoms from one bidentate benzene-1,4-dicarboxyl­ate (1,4-BDC) ligand, two carboxyl­ate O atoms from two different monodentate 4-(1H-1,3,7,8-tetra­aza­cyclo­penta­[l]phenanthren-2-yl)benzoate (HNCP) ligands and two HNCP N atoms. The ZnII atoms are bridged by the centrosymmetric 1,4-BDC ligands, forming an extended single-chain structure. Neighbouring single chains are connected by the HNCP ligands from two opposite directions, resulting in a sheet. In addition, there are N—H⋯O hydrogen-bonding inter­actions between adjacent layers. As a result, the polymeric sheets are further extended into a three-dimensional supra­molecular structure.