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Abstract: Three new nickel(II) complexes [Ni2(btec)(azopy)2(H2O)8]·2H2O (1), {[Ni(H2btec)(azopy)(H2O)2]·(azopy)} n (2) and {[Ni4(btec)2(azopy)3(H2O)10]·8H2O} n (3) (H4btec=1,2,4,5-benzenetetracarboxylic acid; azopy=4,4′-azobispyridine) have been synthesized by tuning the reaction temperature and the metal–ligand ratio. They were characterized by single-crystal X-ray diffraction and elemental analysis. 1 shows a binuclear structure, 2 exhibits a 2D grid, and 3 features an interesting 3D framework with (63)(4.62)(42.62.82) topology formed by two types of interlocked 2D layers. [Copyright &y& Elsevier]

Abstract: Two 2D cadmium coordination polymers {[Cd(pda)(2,2′-bpy)(H2O)]·H2O} n (1) and {[Cd(pda)(4,4′-bpy)(H2O)]·2H2O} n (2) (H2pda=3,4-pyridinedicarboxylic acid; 2,2′-bpy=2,2′-bipyridine; 4,4′-bpy=4,4′-bipyridine) have been synthesized and characterized by elemental analysis, infrared spectroscopy and X-ray single crystal diffraction. The 3D supramolecular structures of both 1 and 2 are constructed by hydrogen bonds between the 2D layers. Importantly, there are intramolecular π⋯π stacking interactions in both of the compounds. Crystallographic data for 1: Orthorhombic, Pbca, a =15.5977(12)Å, b =12.6063(10)Å, c =16.9891(13)Å, Z =8, R 1 =0.0202, wR 2 =0.0504; for 2: Monoclinic, C2/c, a =27.345(4)Å, b =11.2530(16)Å, c =12.1068(16)Å, β =104.197(2)°, Z =8, R 1 =0.0269, wR 2 =0.0625. [Copyright &y& Elsevier]