catena-Poly[[tetraaquazinc(II)]-μ-5-sulfosalicylato-κ2O:O′]

The title coordination polymer, [Zn(C7H4O6S)(H2O)4]n, comprises octahedral Zn atoms bonded to two carboxyl­ate O atoms of the acid ligands and four water mol­ecules. The zinc(II) ions are bridged by carboxyl­ate moieties, creating a one-dimensional chain structure. The Zn—O bond distances lie in the range 2.074 (3)–2.118 (3) Å. The water mol­ecules are involved in hydrogen bonds.