Assembly, structures and properties of four Cu(II) coordination polymers based on a semi-rigid bis-pyridyl-bis-amide ligand and different polycarboxylates

Four new Cu(II) coordination polymers, namely, [Cu(3-bpah)(1,4-NDC)(H2O)]center dot 3H(2)O (1), [Cu-2(3-bpah) (1,4-NDC)(2)]center dot(1,4-H2NDC)center dot 3H(2)O (2), [Cu(3-bpah)(3-NP)] (3), [Cu(3-bpah)(1,3,5-HBTC)]center dot 2H(2)O (4), where 3-bpah = N,N'-bis(3-pyridinecarboxamide)-1,2-cyclohexane, 1,4-H2NDC = 1,4-naphthalenedicarboxylic acid, 3-H2NIP = 3-nitrophthalic acid, 1,3,5-H3BTC = 1,3,5-benzenetricarboxylic acid, have been synthesized under hydrothermal conditions. The structures of 1-4 have been determined by single crystal X-ray diffraction and were further characterized by infrared spectroscopy (IR) and thermogravimetric analyses (TGA). Complex 1 displays a 1D double strand. Complex 2 shows a 3D alpha-Po framework with 1,4-H2NDC guest molecules inside the cages. Complex 3 reveals a 2D wave-like network. Complex 4 exhibits a 2D sql topology. The structural discrepancies of complexes 1-4 imply that the O-donor ancillary ligands play an important role in the formation of the resultant structures of the title coordination polymers. The fluorescent, electrochemical and photocatalytic properties of complexes 1-4 have been studied. (c) 2014 Elsevier B.V. All rights reserved.