Poly[diaqua(μ4‐benzene‐1,2‐dicarboxylato)(isonicotinato‐κ2O,O′)gadolinium(III)]

The title neutral polymer, Gd(C₆H₄NO₂)(C₈H₄O₄)(H₂O)₂]_n, contains an extended two‐dimensional wave‐like lanthanide carboxylate layer decorated by isonicotinate (IN) ligands. The Gd^II atom is eight‐coordinated by four carboxylate O atoms from four benzene‐1,2‐dicarboxylate (1,2‐bdc) ligands, two 1,2‐bdc carboxylate O atoms from one chelating IN ligand and two terminal water molecules, forming a bicapped trigonal–prismatic coordination geometry. The wave‐like layers are stacked in an …ABAB… packing mode along the c‐axis direction. Strong hydrogen‐bonding interactions further stabilize the structure of the title compound.