catena-Poly[[aquadiimidazolecadmium(II)]-μ-thiophene-2,5-dicarboxylato]

The CdII atom has distorted pentagonal bipyramidal coord­ination geometry in the coordination polymer [Cd(TDA)(Him)2(H2O)]n [where TDA2− is the thio­phene-2,5-dicarboxyl­ate dianion (C6H2O4S2−) and Him is imidazole (C3H4N2)]. The cadmium ion is bound by four carboxylate O atoms from two independent TDA2− groups, two N atoms from two different imidazole ligands, and one water mol­ecule. The carboxyl­ate groups bind in bidentate mode to the Cd center, forming a linear chain structure such that the closest Cd⋯Cd distance is 10.577 (6) A. The polymeric chains are connected via hydrogen bonds and π–π stacking inter­actions into a three-dimensional network.