catena-Poly[[lead(II)-μ-N'-[1-(pyridin-2-yl-κN)ethyl-idene]isonicotino-hydrazidato-κN',O:N] perchlorate].

The Pb(II) atom in the polymeric title compound, {[Pb(C(13)H(11)N(4)O)]ClO(4)}(n), is coordinated by the N'-[1-(pyridin-2-yl-κN)ethyl-idene]isonicotinohydrazidate ligand via its O,N,N'-donors and simultaneously bridged by a neighbouring ligand via the pyridin-2-yl N atom. The resultant supra-molecular chain is a zigzag along the a axis. The stereochemistry of the Pb(II) atom is defined by an N(3)OE donor set (E = lone pair of electrons), which results in a Ψ-trigonal-bipyramidal coordination with the O and pyridin-2-yl N atoms in axial positions. The dihedral angle between the pyridine rings of the ligand is 6.3 (3)°. The supra-molecular cationic chains are linked into a three-dimensional array via secondary Pb⋯O [3.133 (6) and 3.28 (7) Å] and Pb⋯N [3.028 (4) Å] inter-actions. Weak C-H⋯O inter-actions and aromatic π-π stacking [centroid-centroid separation = 3.693 (2) Å] also occur in the crystal.