catena -Poly[[bis[aqua(1,10-phenanthroline)lead(II)]-bis(μ 3 -2-hydroxy-5-sulfonatobenzoato)] acetic acid monosolvate]

In the title compound, [Pb-2(C7H4O6S)(2)(C12H8N2)(2)(H2O)(2)] center dot CH3COOH, the seven-coordinate Pb-II atom is chelated by two N atoms of one 1,10-phenanthroline ligand, four O atoms from three 5-sulfosalicylate dianions and one water O atom. Each dianion serves as a bridging ligand, connecting adjacent Pb-II atoms into a centrosymmetric polymeric chain extending parallel to [001]. There are pi-pi interactions between the aromatic systems of neighbouring dianions, with plane-toplane distances of 3.371 (2) angstrom, and between phenanthroline ligands, with a centroid-to-centroid distance of 3.484 (2)angstrom. O-H ... O hydrogen bonding additionally stabilizes the crystal packing. The acetic acid molecules are incorporated in the voids of this arrangement. They exhibit half-occupancy due to disorder around a centre of inversion.