Dipyridyl-type ligand-directed assembly of three cobalt(II) coordinated polymers based on carboxyphenylpropionate

A series of Co(II)-H(2)Cpp coordination polymers incorporating different auxiliary ligands, [Co(Cpp)(Phen)(H2O)] (I), {[Co(Bipy)(H2O)(4)](Cpp)} (n) (II), and [Co(Cpp)(Bds)(H2O)] (n) (III) (H(2)Cpp = 3-(4-carboxyphenyl)propionic acid, Phen = 1,10-phenanthroline, Bipy = 4,4'-bipyridyl, and Bds = 4,4'-bipyridyl sulfide), were synthesized by the hydrothermal reaction and characterized by single crystal X-ray diffraction, elemental analysis, IR, and TG. Three complexes display from 0D to 1D different structural features under the regulation of distinguishing dipyridyl-type coligands. Complex I possesses a binuclear Co(II) motif constructed by H(2)Cpp and Phen, which further developing a zipper-like 2D layer via H-bonded and pi-pi stacking interactions. Complex II displays straight Bipy-bridging 1D chain, and further forming a 3D supramolecular structure by hydrogen-bonded interactions. Complex III exhibits 1D double-chain collectively jointed by Cpp and Bds, which further interlinked into a 3D supramolecular architecture by H-bonded interactions.