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In the title coordination polymer, [PbBr(C 6 H 5 N 2 O 2 )(H 2 O)]  n  , the Pb II  atom is coordinated by one pyrazine N atom, two bridging Br atoms, a water mol­ecule and three carboxyl­ate O atoms. Bridging by the two anions generates a layer structure parallel to (001); the layers are linked by O—H⋯N and O—H⋯Br hydrogen bonds, forming a three-dimensional network. The lone pair is stereochemically active, resulting in a Ψ-dodeca­hedral coordination environment for Pb II .

acta crystallographica. section e

Poly[aqua-μ-bromido-(μ2-5-methylpyrazine-2-carboxylato-κ4N1,O2:O2,O2′)lead(II)]