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

Two new coordination polymers [Cd(dps)2Cl2] (1) and [Co(dps)2(H2O)2]·(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⋯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⋯O and O–H⋯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 antiferromagnetic interactions between the adjacent Co(II) ions in 2.

Graphical abstractTwo new compounds [Cd(dps)2Cl2] (1) and [Co(dps)2(H2O)2]·(abs)2(H2O)2 (2) have been successfully prepared but their components and crystal structures are apparently different. 1 has no Habs ligand and is a 2D cadmium(II) layer polymer, while 2 has uncoordinated abs-ligands and is a double-stranded chain complex. Their fluorescent emission and magnetic properties (for 2) are studied here.Figure optionsDownload full-size imageDownload as PowerPoint slide