A new two-dimensional cadmium coordination polymer with 1 H-imidazole-4-carboxylate and oxalate.

The title compound, poly[aqua(μ2-1 H-imidazole-4-carboxylato-κ3 N3, O: O′)hemi(μ2-oxalato-κ4 O1, O2: O1′, O2′)cadmium(II)], [Cd(C4H3N2O2)(C2O4)0.5(H2O)] n, exhibits a two-dimensional network. The CdII cation is coordinated to one N atom and two carboxylate O atoms from two 1 H-imidazole-4-carboxylate (Himc) ligands, two carboxylate O atoms from the bridging oxalate anion and one ligated water molecule; these six donor atoms form a distorted octahedral configuration. The oxalate anion lies on a centre of inversion. The Himc ligands connect the CdII cations to form -Cd-Himc-Cd-Himc-Cd- zigzag chains, with a Cd...Cd separation of 5.8206 (6) Å along the b direction, which are further linked by tetradentate oxalate anions to generate a two-dimensional herringbone architecture in the ab plane. These layers are extended to form a three-dimensional supramolecular framework via O-H...O and N-H...O hydrogen bonds and π-π stacking interactions. The solid-state photoluminscent behaviour of the title compound has been investigated at room temperature. [ABSTRACT FROM AUTHOR]