catena-Poly[[[diaqua­[3-(pyridin-4-yl)benzoato-κ²O,O′]gadolinium(III)]-bis­[μ-3-(pyridin-4-yl)benzoato-κ²O:O′]] monohydrate]

In the title coordination polymer, {[Gd(C₁₂H₈NO₂)₃(H₂O)₂]·H₂O}_n, the Gd^III ion is ligated by one bidentate carboxyl­ate group, four monodentate bridging carboxyl­ate O atoms and two water mol­ecules. The resulting GdO₈ polyhedron approximates to a square anti­prism. The bridging ligands link the metal ions into a [100] chain, with each pair of adjacent metal ions being bridged by two ligands. Inter-chain O—H...O and O—H...N hydrogen bonds help to establish the packing.