Four Cu(II)/Co(II) coordination polymers based on N,N′-di(3-pyridyl)sebacicdiamide: influence of different carboxylate ancillary ligands on structures and properties

Four Cu(II)/Co(II) coordination polymers, [Cu(L)(BDC)(H2O)]center dot 3H(2)O (1), [Cu(L)(DNBA)(2)] (2), [Co(L)(2)(DNBA)(2)] (3), and [Co(L)(NIPH)(H2O)]center dot H2O (4) (H2BDC = 1,4-benzenedicarboxylic acid, HDNBA = 3,5-dinitrobenzoic acid, H2NIPH = 5-nitroisophthalic acid, L = N, N'-di(3-pyridyl)sebacicdiamide), have been synthesized under hydrothermal conditions. The structures of 1-4 have been determined by single-crystal X-ray diffraction analyses and 1-4 were further characterized by infrared spectroscopy and thermogravimetric analyses. Complex 1 is a 2-D polymeric layer with a 4-connected sql topology. Complex 2 displays a 1-D zigzag chain. Complex 3 possesses a 1-D double-chain structure. Complex 4 exhibits a ribbon chain based on the 1-D [Co-L](n) meso-helical chain. Adjacent layers for 1 and adjacent chains for 2-4 are further linked by hydrogen bonding or p-p stacking interactions to form 3-D supramolecular networks. The differences of carboxylates and metal ions show significant effect on the ultimate architectures of the four complexes. Thermal stabilities, fluorescent properties and photocatalytic activities of 1-4 were also studied. [GRAPHICS] .