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The Pb atom in the polymeric title compound, {[Pb(C 13 H 9 N 3 O 2 )]·CH 3 OH}  n  , is five-coordinated within an N 2 O 2  donor set and a lone pair of electrons, as the  N -isonicotinamido­salicylaldiminate ligand coordinates the Pb II  atom  via  the  O , N , O ′-donors and simultaneously bridges a neighbouring Pb atom  via  the pyridine N atom; the coordination geometry is based on a trigonal bipyramid with the O atoms in axial positions. The resulting supra­molecular chain is a 3 1  helix along the  c  axis. These chains are linked  via  inter­molecular Pb⋯O,N inter­actions, as well as O—H⋯O hydrogen bonds.

catena-Poly[[lead(II)-μ-(2-oxidobenzaldehyde isonicotinoylhydrazonato)] methanol monosolvate]