catena-Poly[[[tetraaquazinc(II)]-mu-4,4'-bipyridine] bis(4-hydroxybenzenesulfonate) trihydrate]

In the title compound, {[Zn(C10H8N2)(H2O)4](C6H5O4S)2.3H2O}n, the Zn atom, the bipyridine ligand and one of water molecules are located on twofold rotation axes. The Zn atom is coordinated by four O atoms from four water molecules and two N atoms from two 4,4'-bipyridine molecules in a distorted octahedral geometry. The Zn2+ ions are linked by the 4,4'-bipyridine molecules to form a one-dimensional straight chain propagating along the c axis. The 4-hydroxybenzenesulfonate counter-ions are bridged by the solvent water molecules through hydrogen bonds to generate a two-dimensional layer featuring large pores. In the crystal packing, the intralayer pores form one-dimensional channels along the c axis, in which the one-dimensional [Zn(C10H8N2)(H2O)4]2+ chains are encapsulated. Electrostatic interactions between cations and anions and extensive hydrogen bonds result in a three-dimensional supramolecular structure.