A new two-dimensional folding sheet-like coordination polymer assembled from cadmium(II) and (S)-2-(benzylamino)succinic acid: synthesis, structure and properties.

A new two-dimensional (2D) coordination polymer, namely, poly[[diaqua[μ-(S)-2-(benzylamino)succinato-κN,O:O:O]cadmium(II)] monohydrate], {[Cd(CHNO)(HO)]·HO}, has been synthesized by the solvothermal reaction of Cd(CHCOO)·2HO with the synthesized ligand (S)-2-(benzylamino)succinic acid (HL). The title compound has been structurally characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction analysis. In the crystal structure, each Cd cation binds to three carboxylate groups from three symmetry-related L dianions. The tetradentate L ligand links three symmetry-related Cd cations into a 2D folding sheet, which can be simplified as a uninodal (3,3)-connected hcb net with the point symbol (6). In the lattice, all the folding sheets are arranged in an interdigitated fashion and aggregate into zipper-like arrays through interlayer π-π interactions. The large and nonpolar side chain may play an important role in the formation and aggregation of the 2D sheet. The thermal stability and photoluminescence properties of the title compound were investigated, and it exhibits a blue emission with a quantum yield of 8%.