• XIANG WANG

      Articles written in Journal of Chemical Sciences

    • 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

      HONGYAN LIN JUNJUN SUN GUOCHENG LIU XIANG WANG PANWEN CHEN

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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

      HONGYAN LIN JIAFENG LIN JING ZHAO YUAN TIAN XIANG WANG GUOCHENG LIU

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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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