Syntheses, Structures, Thermal and Photoluminescence Properties of Two Zn(II) and Cd(II) Coordination Polymers Constructed from Taurine-derived Schiff Base and 4,4′-Bipyridine Ligands

Two chain-like coordination polymers, namely, {[Zn(saes)(4,4'-bipy)(H2O)]center dot H2O}(n) (1) and {[Cd (Hsaes)(2)(4,4'-bipy)(H2O)(2)]center dot 2H(2)O}(n) (2), where H(2)saes = 2-(2-hydroxybenzylideneamino)ethanesulfonic acid and 4,4'-bipy = 4,4'-bipyridine, have been synthesized and characterized by single-crystal X-ray diffraction, IR spectroscopy, elemental, thermogravimetric and photoluminescence analysis. X-Ray diffraction analyses indicate that 1 and 2 display octahedral metal centers with N3O3 and N2O4 donor sets, respectively. The Schiff base serves as a common N,O,O'-tridentate ligand in 1, and as a unique O-monodentate ligand in 2. In the crystal, both 1 and 2 form a 3D supramolecular architecture by O-H center dot center dot center dot O, C-H center dot center dot center dot O interactions or pi center dot center dot center dot pi stacking. The thermal and solid-state photoluminescence properties of both complexes have been investigated.