Articles written in Journal of Chemical Sciences

    • Three 2 D copper(II)/cadmium(II) coordination polymers based on semi-rigid/flexible bis-pyridyl-bis-amide ligands and 5-aminoisophthalate: Syntheses, structures and properties

      Hongyan Lin Huizhe Lu Mao Le Jian Luan Xiuli Wang Cuocheng Liu

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      Three new transition metal coordination polymers [Cu(3-bpcb)0.5(5-AIP)]·2H2O (1), [Cd(3-bpcb)0.5(5-AIP)(H2O)]·H2O (2) and [Cd(3-bpsa)0.5(5-AIP)(H2O)]·2H2O (3) have been hydrothermally synthesized by self-assembly of 5-aminoisophthalic acid (5-H2 AIP), semi-rigid or flexible bis-pyridyl-bis-amide ligands [3-bpcb = N N′-bis(3-pyridinecarboxamide)-1,4-benzene, 3-bpsa = N,N′-bis(3-pyridyl)succinamide], and copper chloride or cadmium nitrate. X-ray diffraction analysis reveals that compounds 1 and 2 possess similar 2 D double-layered structures with (3,4)-connected (63)(65·8) topology, while compound 3 displays a 2 D layer with {62.10}{6} topology. The adjacent layers of 13 are finally extended into 3 D supramolecular frameworks by hydrogen bonding interactions. The bis-pyridyl-bis-amide ligands with different flexibilities play an important role in the construction of final topological structures for the title compounds. Further, the electrochemical behavior of the compound 1 and the fluorescent and photocatalytic properties of compounds 13 have been investigated.

    • Self-assembly, structures and properties of three new Ni(II) coordination polymers derived from two different bis-pyridyl-bis-amide ligands and two aromatic polycarboxylates


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      Three new Ni(II) coordination polymers exhibiting different 1D and 2D framework structures have been hydrothermally synthesized: [Ni(L ¹)(1,3-BDC)(H ₂O) ₃]•H ₂O (1), [Ni(L ¹)(1,3,5-HBTC)(H ₂O) ₃] (2), [Ni ₃ (L ²)3(1,3,5-BTC) ₂ (H ₂O)8]•12H ₂ ₂O (3) [L ¹ = N,N_-bis(pyridin-3-yl)cyclohexane-1,4-dicarboxamide, L ² = N,N’-bis(3-pyridyl)octandiamide, 1,3-H ₂BDC = 1,3-benzenedicarboxylic acid, 1,3,5-H3BTC = 1,3,5- benzenetricarboxylic acid]. X-ray single crystal diffraction analyses revealed that polymer 1 is a 2D interlaced layer based on the 1D [Ni(L ¹)(1,3-BDC)(H ₂O) ₃] meso-helical chains. Polymer 2 is a 1D wave-shaped chain derived from the 1D [Ni(L ¹)]n chain and monodentate coordinated 1,3,5-HBTC anions. Polymer 3 possesses an interesting 2D layer containing the trinuclear [Ni ₃ (1,3,5-BTC) ₂] substructural unit and 1D zigzag [Ni(L ²)]n chain, representing a 3,4-connected {6•8 ²} ₂{6 ² •8 ² • 10• 12} topology. Finally, the adjacent 1D chains or the 2D layers are connected through hydrogen bonding interactions to construct 3D supramolecular networks. Further, the thermal stability, solid state fluorescent property and photocatalytic activity of 1–3 have been investigated.

    • Effect of three aromatic polycarboxylates on the structural diversities and properties of three new cadmium(II) coordination compounds


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      Three newcadmium(II) coordination compounds [Cd2(L)2(btec)(H2O)2]·3H2O(1), [Cd(HL)(btb)] (2) and [Cd(L)(pda)] · 2H2O (3) were prepared by hydrothermal reactions of cadmium(II) chloride with ligands L (L = N,N'-bis(3-pyridyl)octandiamide) in the presence of different aromatic polycarboxylates(H2btec = 1,2,4,5-benzenetetracarboxylic acid, H2btb = 1,3,5-tri(4-carboxylphenyl)benzene, H2pda = 1,4-phenylenediacetic acid). The structures of compounds 1–3 have been determined by X-ray single crystal diffraction analyses and further characterized by infrared spectroscopy (IR), powder X-ray diffraction (PXRD) and thermogravimetric (TG) analyses. Compound 1 displays a 3D metal-organic framework with (4,4,4)-connected {62.84}{63.83}{64.82} topology constructed from 2D [Cd2(btec)]n layers and μ2-bridging L ligands.Compound 2 is a 3D (3,3)-connected {103} topological network based on the 3D [Cd(btb)]n−n framework and the protonated monodentate HL ligand. Compound 3 shows a 2D layer with (3,5)-connected (42 · 67 · 8)(42 · 6) topological structure, which are further linked by hydrogen bonding interactions to form a 3D supramolecular network. The influences of three aromatic polycarboxylates on the structures of title compounds are investigated. Further, the fluorescent properties of three cadmium(II) compounds and their fluorescent sensing properties towards small solvent molecules and metal cations have been studied.

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