catena -Poly[zinc(II)-μ 3 -{hydrogen [1-hydroxy-2-(3-pyridinio)ethane-1,1-diyl]diphosphonato}]

In the polymeric title compound, [Zn(C7H9NO7P2)]n, the zinc(II) centre displays a tetrahedral coordination geometry provided by four O atoms from three different phosphonate groups. The crystal structure consists of ladder chains parallel to the b axis built up from vertex-sharing of ZnO4 and PO3C tetrahedra. The chains are linked by strong intra- and interchain O—H...O and N—H...O hydrogen bonds, forming a three-dimensional supramolecular assembly.