catena-Poly[[bis­[aqua­(1,10-phenanthroline)lead(II)]-bis­(μ₃-2-hy­droxy-5-sulfonato­benzoato)] acetic acid monosolvate]

In the title compound, [Pb₂(C₇H₄O₆S)₂(C₁₂H₈N₂)₂(H₂O)₂]·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 π–π inter­actions between the aromatic systems of neighbouring dianions, with plane-to-plane distances of 3.371 (2) Å, and between phenanthroline ligands, with a centroid-to-centroid distance of 3.484 (2) Å. 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.