catena-Poly[[diaqua(nicotinato-κ²O,O′)cadmium(II)]-μ-nicotinato-κ³N:O,O′].

The title compound, [Cd(C₆H₄NO₂)₂(H₂O)₂]_n, forms a one-dimensional chain structure based on a Cd atom with approximate pentagonal bipyramidal coordination geometry and two nicotinate ligands in different coordination modes. One acts as a tridentate ligand, chelating one Cd atom through the carboxylate group while simultaneously binding to a second symmetry-related Cd atom through the pyridine N atom; the other acts only as a bidentate ligand through its carboxylate group. Hydrogen bonds utilizing the coordinated water molecules, uncoordinated nitrogen and carboxylate O atoms as acceptors link the chains. [ABSTRACT FROM AUTHOR]