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Du G.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules | Wang X.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules | Zhang L.,Tianjin Bohai Vocational Technical College | Feng Y.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules | Liu Y.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules
Materials Letters | Year: 2013

Graphene-ZnO nanocomposites were successfully synthesized by a one-step hydrothermal approach, using glucose as a green reducing agent. The in-situ formed hexagonal ZnO particles were randomly decorated on the surfaces of graphene oxide sheets, which were simultaneously reduced directly to form the graphene sheets and the ZnO particles acted as spacers to keep the neighboring sheets separate. Photoluminescence spectra of graphene-ZnO nanocomposites displayed the fluorescence quenching property. Electrochemical tests showed that the graphene-ZnO composite electrodes enhanced the capacitive behavior with higher capacitance values (118 F/g) and better capacitive behavior as compared with pure graphene, which predicted their potential application in energy storage. © 2013 Elsevier B.V. Source


Meng J.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules | Sun Y.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules | Li Y.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules
Chinese Journal of Chromatography (Se Pu) | Year: 2014

Metal-organic frameworks (MOFs) are concerned mainly due to the unusual properties for diverse analytical applications, such as high surface area, good thermal stability, inpore functionality and outer-surface modification. Two metal-organic complexes were prepared by two methods of hydrothermal synthesis and room temperature synthesis, separately. The compositions, structures, thermal stability and adsorption properties of the two complexes were characterized by X-ray powder diffraction (XRD) , thermogravimetric analysis (TGA) , Fourier transform infrared spectroscopy (FT-IR) , scanning electron microscopy ( SEM) and Brunauer-Emmett-Teller (BET) method, which indicated that the two complexes have not only good thermal stability but also good adsorption for polycyclic aromatic hydrocarbons (PAHs). PAHs enter into environment leading to pollution by industrial and agricultural production and life, rooting in the incomplete combustion or pyrolysis of organism. PAHs are strongly carcinogenic and mutagenic. Some PAHs are considered as endocrine disruptors, and maybe have biological effects on human health. Regulations have thus been formulated for monitoring and controlling PAHs by the United States Environmental Protection Agency ( U. S. EPA) and other government agencies. Adsorption kinetic of PAHs on the two complexes could be well described by the pseudo-second order kinetic model, and the adsorption behaviors of the two complexes on PAHs are in accord with Langmuir model. In addition, the adsorption capacities increase with the increasing adsorbent dosage. It is proved by the FT-IR data that n-n interactions between the PAHs and the framework terephthalic acid molecules. Ten PAHs were adsorbed well on the two complexes which have good adsorptive selectivity. By further optimizing of the two complex materials, it is promising to use them as chromatographic stationary phases. Source


Liu Q.-X.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules | Liu Q.-X.,Key Laboratory of Inorganic Organic Hybrid Functional Material Chemd Istry | Liu Q.-X.,Tianjin Normal University | Liu R.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules | And 14 more authors.
CrystEngComm | Year: 2015

A series of functionalized bis-azolium salts, 1,8-bis[2′-(N-R-azoliumyl)ethoxy]-9,10-anthraquinone hexafluorophosphate L1H2·(PF6)2-L4H2·(PF6)2 (R = Et, CH2Ph and CH2Py, azoliumyl = benzimidazoliumyl or imidazoliumyl), as well as their seven N-heterocyclic carbene mercury(ii) and silver(i) complexes [(L2HgBr)2](HgBr4) (1), [L2Hg(HgI4)]2 (2), [L1Hg(HgI4)] (3), [L4Hg(HgI4)] (4), [L1Ag](PF6) (5), [L3Ag](PF6) (6) and [L4Ag](PF6) (7) have been prepared and characterized. In complexes 1 or 2, two 16-membered macrometallocycles are connected together via two bridging halide ions (two bridging bromide ions for 1, and two bridging iodide ions for 2). In complexes 3-7, each molecule contains one 16-membered macrometallocycle formed by one biscarbene ligand (L1 for 3 and 5, L3 for 6, L4 for 4 and 7) and one metal ion (Hg(ii) for 3 and 4, Ag(i) for 5-7). In the crystal packings of 1-7, 2D supramolecular layers and 3D supramolecular architectures are formed via intermolecular weak interactions (such as the hydrogen bonds, π-π interactions and C-H⋯π contacts). In addition, the fluorescence emission spectra of the complexes and bis-azolium salts were described. The cyclic voltammetry study for silver(i) complexes 5-7 was conducted. © The Royal Society of Chemistry. Source


Liu Q.-X.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules | Bi Y.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules | Zhao X.-J.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules | Zhao Z.-X.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules | And 2 more authors.
CrystEngComm | Year: 2014

Seven Cu(ii) and Co(ii) complexes [Co(L)2(H2O) 2]Cl2 (1), [Cu(L)Cl2]2 (2), [Cu(L)(NO3)2]2 (3), [Cu(L)(SO 4)]2 (4), [Co(L)(LA)]n (5), [Cu(L)(OAc)2] (6) and [Co(L)Cl2] (7) (L = 1,2-bis(2′-ethoxy)phenyl-bis(benzimidazole), LA = terephthalate) have been prepared by means of self-assembly of Cu(ii) or Co(ii) salts with bis-benzimidazolyl chelate ligand L and a 1,2-bis(2′-ethoxy) phenyl linker. These complexes are structurally characterized by X-ray diffraction analyses. In complexes 1-4, two 15-membered macrometallocycles of each molecule are linked together via sharing moieties (the sharing moieties: Co(ii) atom for 1, two bridging chlorine atoms for 2, two bridging nitrate groups for 3 and two bridging sulfate groups for 4) to afford a dimer, in which each 15-membered macrometallocycle is constructed from one ligand L and one metal atom (Co(ii) for 1 and Cu(ii) for 2-4). In complex 5, a 1D polymeric chain with 15-membered macrometallocycles is formed via ligand L, terephthalate and a Co(ii) atom. In complexes 6 and 7, each molecule contains a 15-membered macrometallocycle formed by one ligand L and one metal atom (Cu(ii) for 6 and Co(ii) for 7). In the crystal packings of 1-7, 2D supramolecular layers or 3D supramolecular frameworks are formed via intermolecular weak interactions, including hydrogen bonds, π-π interactions and C-H⋯π contacts. The conformations of the metal complexes based on ligand L are described. Additionally, the fluorescence emission spectra of ligand L and the metal complexes 1-7, and the magnetic properties for complexes 1-7 are reported. © The Royal Society of Chemistry 2014. Source


Liu Q.-X.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules | Huo R.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules | Liu J.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules | Wei Q.,Tianjin Key Laboratory of Structure and Performance for Functional Molecules | And 2 more authors.
Organometallics | Year: 2015

A series of new acyclic tetrazolium salts featuring a central anthracence building block which were 9,10-substituted with (N-R-azoliumCH2CH2)2NCH2- groups were prepared (azolium = benzimidazolium or imidazolium, R = picolyl, ethyl, nbutyl, or benzyl). These tetrazolium salts were metalated with silver(I) leading to four novel NHC tetranuclear complexes 1-4. Molecular structures of 1-4 and one tetraimidazolium salt L1H4·(HgI4)2 were established by 1H NMR, 13C NMR spectroscopy and X-ray crystallography. Silver(I) η3-arene interactions exist in complex 1. Each molecule of complexes 2-4 contains one 42-membered and two 21-membered macrometallocycles. It was interesting to observe intramolecular extended π-π interactions originated from imidazole-anthracene-anthracene-imidazole in complexes 3 and 4. In addition, the fluorescence emission spectra of the complexes and the tetrazolium salts were studied. © 2015 American Chemical Society. Source

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