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The Pb II  atom in the polymeric title compound, [Pb(C 8 H 4 O 4 )(C 12 H 6 N 2 O 2 )]  n  , is chelated by the N-heterocycle, and adjacent atoms are bridged by rigid terephthalate dianions into a linear chain. The Pb II  atom is stereochemically active in a ψ-square-pyramidal coordination geometry in which the lone-pair electrons occupy a basal site. When three other weaker Pb⋯O inter­actions are considered, the geometry is a ψ-dodeca­hedron.

acta crystallographica. section e

catena-Poly[[(1,10-phenanthroline-5,6-dione-κ2N,N′)lead(II)]-μ-terephthalato-κ2O1:O4]