Catena-Poly[[(μ-3-hydroxybenzoato-κ ³O ¹,O ^1′:O ³)(μ-3-hydroxybenzoato- κ ³O ¹,O ^1′:O ¹) (isonicotinamide-κN ¹)-lead(II)] monohydrate]

In the crystal of the title polymeric compound, {[Pb(C ₇H ₅O ₃) ₂(C ₆H ₆N ₂O)]·H ₂O} _n , the Pb ^II ion is chelated by two carboxylate groups of 3-hydroxybenzoate (HB) anions, and coordinated by one isonicotinamide molecule; a carboxylate O atom and a hydroxy O atom from adjacent HB anions bridge the Pb ^II ion to form polymeric chains along [100], in which the Pb ^II ion is in an irregular seven-coordination geometry. The carboxylate groups of the HB ions are slightly twisted away from the attached benzene rings by 2.84 (15) and 4.8 (2)°. The planes of the two benzene rings of the HB ions are oriented with respect to each other at a dihedral angle of 84.41 (8)°. In the crystal, adjacent polymeric chains interact via O - H⋯O, N - H⋯O and weak C - H⋯O hydrogen bonds. The solvent water molecule links with the polymeric chains via O - H⋯O hydrogen bonding. π-π stacking between the benzene and pyridine rings and between the benzene rings [centroid-centroid distances = 3.731 (2) and 3.353 (2) Å] are present in the crystal.