Crystal structure of poly[di-aqua-bis-(μ 5 -benzene-1,3-di-carboxyl-ato)( N , N -di-methyl-formamide)-cadmium(II)disodium(I)].

The title compound, [CdNa2 (C8 H4 O4 )2 (C3 H7 NO)(H2 O)2 ] n or [CdNa2 (1,3-bdc)2 (DMF)(H2 O)2 ] n , is a new CdII -NaI heterobimetallic coordination polymer. The asymmetric unit consists of one CdII atom, two NaI atoms, two 1,3-bdc ligands, two coordinated water mol-ecules and one coordinated DMF mol-ecule. The CdII atom exhibits a seven-coordinate geometry, while the NaI atoms can be considered to be penta-coordinate. The metal ions and their symmetry-related equivalents are connected via chelating-bridging carboxyl-ate groups of the 1,3-bdc ligands to generate a three-dimensional framework. In the crystal, there are classical O-H⋯O hydrogen bonds involving the coordinated water mol-ecules and the 1,3-bdc carboxyl-ate groups and π-π stacking between the benzene rings of the 1,3-bdc ligands present within the frameworks.