• WEI LIU

      Articles written in Journal of Chemical Sciences

    • Combustion synthesis and characterization of porous perovskite catalysts

      Yuehui Wu-Laitao Luo Wei Liu

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      Porous perovskite-type complex oxides LaCoO3 and La0.95Sr0.05Ni0.05Co0.95O3 were produced by combustion method. The properties of these porous materials such as crystal structures, particle sizes, surface patterns, pore size, surface area and pore volume were characterized by X-ray diffraction( XRD), scanning electron microscopy(SEM) and BET measurements. The results indicated that all porous materials are of the perovskite-type complex oxides. Doping Sr2+ ions on site A and doping Ni2+ ions on site B entered the crystal lattices of LaCoO3 in the place of La3+ and Co3+, respectively, and the maximum peak of XRD patterns of doping sample was weaken and broaden. Morphological microscopy demonstrated agglomerates involved mostly thin smooth flakes and layers perforated by a large number of pores and its lamella decreased with the introduction of Sr2+ and Ni2+. Hysteresis loop in the N2 adsorption-desorption isotherm of samples indicated its porous structures and the doping effect on its pore size, surface area and pore volume were improved. The porous catalysts have been tested for methane catalytic combustion and the results showed that these catalysts possessed high catalytic activity.

    • Synthesis, Spectroscopic Properties and DFT Calculation of Novel Pyrrolo[1',5'-a]-1,8-naphthyridine Derivatives through a Facile One-pot Process

      GAO-ZHANG GOU BO ZHOU HE-PING YAN YONG HONG WEI LIU SHAO-MING CHI CHAO-YONG MANG

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      Novel pyrrolo[1',5'-a]-1,8-naphthyridine compounds (L1-L4) have been synthesized through a facile one-pot process by the reaction of the corresponding 1,8-naphthyridines with aliphatic anhydride. The structures were established by spectroscopic data. Further, X-ray crystal analysis of 7-diacetamino-2,4-dimethy-1,8-naphthyridine (L1) identifies its molecular structure and reveals π-π stacking. The synthetic mechanisms for L2, L3 were studied by density functional theory calculations. And a comprehensive study of spectroscopic properties involving experimental data and theoretical studies is presented. L1 exhibited electronic absorption spectrum with λmax at ∼320 nm. L2-L4 exhibited similar electronic absorption spectra with λmax at ∼390 nm that is tentatively assigned to π→π* transition. The assignment was further supported by density functional theory (DFT) calculations.

    • Metal-free selective aryl C–H formylation co-controlled by 1,2,3-triazole and hydroxyl using DMSO as formyl source

      XINYUAN MA WEIGEN DU WEI LIU YAOWEN LIU TIEBO XIAO YUBO JIANG

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      A facile and efficient method for direct C–H formylation of phenolated 1,4-disubstituted 1,2,3-triazoles using DMSO as the formyl source has been developed. The reaction proceeded smoothly under metal-free conditions with good functional group tolerance and high selectivity co-controlled by the triazole ring and hydroxyl group.

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