| Summary: | In the crystal of the title polymeric compound, {[Pb(C7H5O3)2(C6H6N2O)]·H2O}n, the PbII 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 PbII ion to form polymeric chains along [100], in which the PbII 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.
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