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In the title complex, [Pb(C 8 H 9 N 2 O 4 ) 2 (H 2 O) 2 ]  n  , the eight-coordinate Pb II  atom lies on a twofold rotation axis and adopts a slightly distorted square-anti­prismatic N 2 O 6  coordination geometry. The ligand donor atoms are the tertiary N atoms of the imidazole rings and the carboxyl­ate O atoms of two chelating 5-carb­oxy-2-propyl-1 H -imidazole-4-carboxyl­ate ligands, the carb­oxy O atoms of two additional imidazole ligands and two water O atoms. The carb­oxy O and the  N , O -chelate systems also link adjacent Pb II  atoms, forming a two-dimensional layer structure, with four individual Pb II  atoms located at the corners of a square. These layers are further inter­connected by an extensive array of O—H⋯O and N—H⋯O hydrogen bonds into a three-dimensional network.

acta crystallographica. section e

Poly[diaquabis(μ2-5-carboxy-2-propyl-1H-imidazole-4-carboxylato-κ3N3,O4:O5)lead(II)]