Dong-Dong Qin

Lanzhou University, Kao-lan-hsien, Gansu Sheng, China

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Publications (17)37.25 Total impact

  • [show abstract] [hide abstract]
    ABSTRACT: A monoclinic BiVO4 film was grown on a transparent conducting substrate for photoelectrochemical oxidation of water. A photocurrent up to 2.3 mA cm(-2) under visible light (λ > 420 nm) was achieved after treating the sample simply by electrochemical reduction followed by NaBH4. The high photocurrent is believed to be due to the improved carrier separation and transportation as a result of increased donor density.
    Dalton Transactions 04/2014; · 3.81 Impact Factor
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    ABSTRACT: Films of crystalline WO(3) nanosheets oriented perpendicular to tungsten substrates were grown by a surfactant-free hydrothermal method, followed by sintering. The films exhibit photoelectrochemical oxygen evolution at low overpotential.
    Chemical Communications 11/2011; 48(5):729-31. · 6.38 Impact Factor
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    ABSTRACT: The controlled growth of highly ordered, [211]-oriented FeOOH nanowire arrays on various substrates, such as Pt, W, Ti, and fluoride-doped tin oxide (FTO) glass, was achieved by a solvothermal method in aqueous acetonitrile solutions at 80–120 °C, following by annealing to form α-Fe2O3 nanowires with their [110] direction perpendicular to the substrate. Adjusting the reaction pH and temperature enables control of the nanowire length. In particular, the pH has a dramatic effect on the nanowire growth, with low pH resulting in the growth of longer wires because of the acid-catalyzed hydrolysis of acetonitrile. Photoactive hematite was prepared by diffusing Ti or Sn into the nanowires during thermal annealing. Processing parameters that influenced the photoelectrochemical performance of these nanowire arrays, including the annealing regime, temperature, and length of nanowires, are discussed in detail. The Ti- and Sn-doped one-dimensional [110]-oriented α-Fe2O3 nanowire arrays provide an effective pathway for electron transport, demonstrating increased photocurrents, up to 1.3 mA/cm2 under air mass 1.5 global (AM 1.5G) illumination, in photoelectrochemical water oxidation.
    11/2011;
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    ABSTRACT: In the article, a novel fluorescent probe for the copper cation based on fluorescence quenching mechanism was designed. It exhibited high selectivity for Cu(II) over other common metal ions in aqueous media. Furthermore the coordination between Cu(II) and the organic molecule sensor fabricated an interesting 1D chain coordination polymer framework.
    Dalton Transactions 08/2011; 40(37):9370-3. · 3.81 Impact Factor
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    ABSTRACT: Herein, we report for the first time on the preparation of four Paeonol Schiff-base ligands: 1,2-Bis(2-hydroxy-4-methoxy-α-methylbenzylideneimino) ethane (H2L1), 2-hydroxy-4-methoxy-α-methylbenzylidene (benzoyl) hydrazone (HL2), 2-hydroxy-4-methoxyacetophenone-ethanolamine Schiff-base (HL3), and 2-hydroxy-4-methoxyacetophenone(2′-hydroxybenzoyl) hydrazone (H2L4), and their Cu(II) complexes, of which the structure of C11N2O6H14Cu(CuL3.NO3) was confirmed by X-ray diffraction. Antioxidant activities of four Cu(II) complexes were studied by the standard non-enzymatic NBT method and Fenton system, used to produce superoxide anion radicals and hydroxyl radicals, respectively. The results show these Cu(II) complexes have excellent antioxidant activities. DNA-binding and in vitro cytotoxicity experiments were utilized to further investigate the biological activities of C11N2O6H14Cu(CuL3.NO3). These results support C11N2O6H14Cu as a potential candidate for biological use because it shows not only high antioxidant and moderate DNA-binding activities, but also good tumor cell cytotoxicity activities in human cell lines carcinomas Hep-2 (larynx), for the range of concentrations tested.
    Inorganic Chemistry Communications - INORG CHEM COMMUN. 01/2010; 13(6):727-729.
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    ABSTRACT: Two novel 2-oxo-quinoline-3-carbaldehyde (4'-hydroxybenzoyl) hydrazone, thiosemicarbazone ligands and its corresponding Cu(2+) complexes were synthesized, and the two complexes' structures were determined by X-ray single crystal diffraction. The interaction of the two Cu(2+) complexes with calf thymus DNA (CT-DNA) was investigated by electronic absorption spectroscopy, fluorescence spectroscopy and viscosity measurement. The experimental evidences indicated that the two water-soluble Cu(2+) complexes could strongly bind to CT-DNA via an intercalation mechanism. The intrinsic binding constants of complexes 1 and 2 with CT-DNA were 7.31 x 10(6) and 2.33 x 10(6)M(-1), respectively. Furthermore, the antioxidant activities (hydroxyl radical and superoxide) of the two water-soluble metal complexes were determined by hydroxyl radical and superoxide scavenging method in vitro.
    European journal of medicinal chemistry 07/2009; 44(11):4477-84. · 3.27 Impact Factor
  • Dong-dong Qin, Zheng-yin Yang, Gao-fei Qi
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    ABSTRACT: The synthesis of three Paeonol Schiff base ligand and their Zn(II) complexes are reported. The complexes were fully characterized by IR, (1)H NMR, elemental analysis and molar conductivity. The experiment results show the three Zn(II) complexes can emit bright fluorescence at room temperature in DMF solution and solid state. The fluorescence quantum yields (Phi) of three Schiff base ligands and their Zn(II) complexes were calculated using quinine sulfate as the reference with a known Phi(R) of 0.546 in 1.0N sulfuric acid. Furthermore, in order to develop these Zn(II) complexes' biological value, the antioxidant activities against hydroxyl radicals (OH*) were evaluated. The results show the three complexes possess excellent ability to scavenge hydroxyl radicals.
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 07/2009; 74(2):415-20. · 1.98 Impact Factor
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    ABSTRACT: The neutral mononuclear Ln(III) complexes (Ln = La, Sm) with 7-methoxychrom-one-3-carbaldehyde-isonicotinoyl hydrazone ligand (L) have been synthesized, characterized and investigated their interactions with calf-thymus DNA. The results show that the binding affinity of the La(III) complex is stronger than that of the Sm(III) complex and that of the ligand (L). Furthermore, the antioxidant activities of the ligand (L) and its Ln(III) complexes (Ln = La, Sm) were studied in detail.
    Biology of Metals 05/2009; 22(6):927-40. · 3.17 Impact Factor
  • Gao-Fei Qi, Zheng-Yin Yang, Dong-Dong Qin
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    ABSTRACT: A new chromone derivative (7-methoxychromone-3-carbaldehyde-benzoylhydrazone) ligand (HL) and its novel Cu(II) complex have been synthesized and characterized on the basis of elemental analyses, molar conductivities, proton nuclear magnetic resonance, infrared spectra and mass spectra analyses. The general formula of the Cu(II) complex is [CuL(HB2BO)]Cl x 2H2O. In addition, the interaction of the Cu(II) complex and its free ligand with calf-thymus DNA was investigated by electronic absorption spectroscopy, fluorescence spectroscopy and viscosity measurement. Results suggest that both the two compounds can bind with calf-thymus DNA via an intercalation mechanism. Furthermore, the Cu(II) complex can bind to DNA more strongly than the free ligand due to the chelating effect of copper(II) ion to the free ligand.
    CHEMICAL & PHARMACEUTICAL BULLETIN 02/2009; 57(1):69-73. · 1.56 Impact Factor
  • Hong-Ge Li, Zheng-Yin Yang, Dong-Dong Qin
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    ABSTRACT: An original Schiff-base type fluorescent chemosensor 1-phenyl-3-methyl-5-hydroxypyrazole-4-carbaldehyde(benzoyl)hydrazone (H2L) for Cu2+ has been designed and synthesized. An obvious fluorescence quenching only for Cu2+ demonstrates that ligand H2L exhibits high selectivity and efficient signaling behavior toward micromolar concentration of Cu2+ compared with other metal ions. At the same time, the coordination form between ligand and Cu2+ is elucidated via crystal structure.
    Inorganic Chemistry Communications - INORG CHEM COMMUN. 01/2009; 12(6):494-497.
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    ABSTRACT: A novel chromone Schiff base, 7-methoxychromone-3-carbaldehyde-(4'-hydroxy) benzoyl hydrazone (L) and its Ln(III) complexes (Ln = La, Eu) were synthesized and characterized. The crystal structure of the La(III) complex was determined by single-crystal X-ray diffraction: crystallized in the orthorhombic system, space group Pbcn, Z = 8, a = 14.595(2)A, b = 20.055(3)A, c = 30.078(5)A, R(1) = 0.0657. Fluorescence titration spectra, electronic absorption titration spectra, EB displacement and viscosity measurement indicated that both the ligand and the complexes can bind to DNA via the intercalation mode, and that the binding affinity of the La(III) complex is higher than that of the Eu(III) complex and of the ligand (L). The antioxidant activity experiments show that these compounds also exhibit good antioxidant activities against (*)OH and O(2)(-). Moreover, the Eu(III) complex exhibits characteristic fluorescence of europium ion in different organic solvents.
    European journal of medicinal chemistry 11/2008; 44(6):2425-33. · 3.27 Impact Factor
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    ABSTRACT: A novel Schiff base ligand (L = 7-methoxychromone-3-carbaldehyde benzoyl hydrazone) and its La(III) and Eu(III) complexes have been successfully prepared. The crystal structure of [LaL(2)(NO(3))(3)].H(2)O was characterized by X-ray crystallography. It crystallizes in monoclinic, space group C2/c with crystallographic data: a = 27.7173(17) A, b = 10.0002(6) A, c = 14.7884(9) A, beta = 102.6870(10) degrees and Z = 4. In the structure, the La(III) ion satisfies 12 coordination and three nitrate coordinate as bidentate ligand. The biological experiments show that the ligand and its two complexes can strongly bind to DNA through intercalation mode, and the three compounds also exhibit good antioxidant activities against OH(*) and O(2) (-*). Moreover, it is found that the Eu(III) complex exhibits characteristic fluorescence of europium ion in different organic solvent.
    Journal of Fluorescence 11/2008; 19(3):409-18. · 1.79 Impact Factor
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    ABSTRACT: A new coumarin derivative (8-methylcoumaro-4a,10a-pyrone-3-carbaldehyde benzoyl hydrazone) ligand and its novel Cu(II) complex have been synthesized and characterized on the basis of elemental analyses, molar conductivities, (1)H-NMR, IR spectra, UV-visible spectroscopy and thermal analyses. In addition, the interactions of the Cu(II) complex and the ligand with calf-thymus DNA were investigated by spectrometric titrations, ethidium bromide displacement experiments and viscosity measurements. It was found that both the two compounds, specially the Cu(II) complex, strongly bind with calf-thymus DNA, presumably via an intercalation mechanism.
    CHEMICAL & PHARMACEUTICAL BULLETIN 05/2008; 56(4):452-6. · 1.56 Impact Factor
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    ABSTRACT: A new ligand, ethylenediiminobi(6-hydroxychromone-3-carbaldehyde) Schiff-base (L), was prepared by condensation of 6-hydroxy-3-carbaldehyde chromone (CDC) with ethylenediamine. Its three rare earth complexes have been synthesized and characterized on the basis of elemental analyses, molar conductivities, mass spectra, 1H NMR, thermogravimetry/differential thermal analysis (TG-DTA), UV–vis spectra, fluorescence spectra and IR spectra. The general formula of the complexes is [LnL·(NO3)2]·NO3 [Ln = Sm (1), Eu (2), La (3)]. Complexes 1, 2 and 3, and ligand L were subjected to biological tests in vitro using HepG2 cancer cell lines. Ligand showed significant cytotoxic activity against HepG2cancer cell lines. Spectrometric titration, ethidium bromide displacement experiments and viscosity measurements indicate that Sm(III) and Eu(III) complexes strongly bind with calf thymus DNA, presumably via an intercalation mechanism. The intrinsic binding constants of complexes 1 and 2, and ligand with DNA were 9.28 × 106, 8.40 × 106 and 4.88 × 106 M−1 through fluorescence titration data, respectively.
    Journal of Photochemistry and Photobiology A: Chemistry. 01/2008;
  • Dong-Dong Qin, Zheng-Yin Yang, Bao-Dui Wang
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    ABSTRACT: New [CuL.(H(2)O)(3)]NO(3).H(2)O and [NiL.H(2)O]NO(3).2H(2)O complexes with Schiff base (LNa) derived from 6-hydroxy-3-carbaldehyde chromone (CDC) and glycine are reported. Two complexes have been characterized by elemental analysis, IR data, TG/DTA and molar conductivity. The binding of these two complexes to calf thymus DNA (CT-DNA) has been investigated, respectively, with UV-vis spectroscopy, fluorescence spectroscopy and viscosity measurements. The experiment results indicate that the two complexes may bind to CT-DNA through an intercalative mode and [CuL.(H(2)O)(3)]NO(3).H(2)O intercalates into DNA more deeply than [NiL.H(2)O]NO(3).2H(2)O. Their intrinsic binding constants (K) with DNA are 6.08 x 10(5) and 2.76 x 10(5)M(-1).
    Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 12/2007; 68(3):912-7. · 1.98 Impact Factor
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    ABSTRACT: Two novel rare earth complexes, Y(III) complex (1) and Eu(III) complex (2), with naringenin-2-hydroxy benzoyl hydrazone ligand were synthesized and characterized. The interaction of the two metal complexes and the free ligand with calf thymus DNA (CT DNA) was investigated by electronic absorption spectroscopy, fluorescence spectroscopy and viscosity measurement. All the experimental evidences indicate that these three compounds can strongly bind to CT DNA via an intercalation mechanism. The intrinsic binding constants of the Y(III) complex (1), Eu(III) complex (2) and the free ligand with CT DNA were 2.1 x 10(4), 8.5 x 10(4) and 1.6 x 10(4) M(-1), respectively. Furthermore, the antioxidant activity of the metal complexes was determined by hydroxyl radical scavenging method in vitro.
    European Journal of Medicinal Chemistry 11/2007; 43(8):1688-95. · 3.50 Impact Factor
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    ABSTRACT: Water-soluble Ni(II) and Cu(II) complexes of a flexible Schiff-base ligand have been synthesized, and the Ni(II) complex was characterized by X-ray crystallography. The interactions of the two complexes with calf thymus DNA were investigated by spectroscopic and viscosity measurements in water. The results suggest that the two complexes bind to DNA within the groove. Antioxidant experiments against OH• and O2−• show that these two complexes have excellent ability to scavenge O2−•, and the Cu(II) complex exhibits better activity than the Ni(II) complex.
    Transition Metal Chemistry 34(5):499-505. · 1.18 Impact Factor