Syntheses, crystal structures and properties of Cd(II) and Co(II) complexes with 4,4′-dipyridylsulfide ligand

Two new coordination polymers [Cd(dps)(2)Cl-2] (1) and [Co(dps)(2)(H2O)(2)]center dot(abs)(2)(H2O)(2) (2) (dps = 4, 4'-dipyridylsulfide, Habs = 4-amino benzenesulfonic acid) have been synthesized under similar conditions and characterized by elemental analysis, fluorescence spectra and single crystal X-ray diffraction. Compound 1 displays a dps-bridged 2D puckered, grid-like layer, which is further linked by C-H center dot center dot center dot Cl hydrogen bonds to form a 3D supramolecular architecture. Compound 2 shows a dps-bridged double-stranded chain structure, which is extended by N-H center dot center dot center dot O and O-H center dot center dot center dot O hydrogen bonds generating a 3D network. Solid-state fluorescence results reveal that both complexes can emit strong emission bands, at 467 nm and 518 nm for 1 and 344 nm for 2, respectively. Magnetic measurements show that there are weak anti-ferromagnetic interactions between the adjacent Co(II) ions in 2. (c) 2009 Elsevier B.V. All rights reserved.