Poly[diaqua(mu4-benzene-1,2-dicarboxylato)(isonicotinato-kappa2O,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.