Poly[μ3-hydroxido-μ-(pyridine-2,4,6-tricarboxyl­ato)-dilead(II)]

The asymmetric unit of the title coordination polymer, [Pb 2 (C 8 H 2 NO 6 )(OH)] n , contains two crystallographically independent Pb II ions, one pyridine-2,4,6-tricarboxyl­ate (ptc) trianion and one hydroxide anion. One of the Pb II atoms is coordinated by one pyridine N and four carboxyl­ate O atoms from the ptc trianion and a hydroxide O atom in a distorted octa­hedral geometry. The other Pb II atom is five-coordinated by three carboxyl­ate O atoms and two hydroxide O atoms in a distorted tetra­gonal–pyramidal geometry. Four neighbouring Pb II atoms are bridged through two μ 3 -hydroxide ligands, forming the centrosymmetric Pb 4 (OH) 2 core. The three-dimensional structure is further achieved through bridging carboxyl­ate groups. There are also O—H⋯O hydrogen bonds between the hydroxide ligand and the carboxyl­ate group.