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Articles by Wen Gu
Total Records ( 9 ) for Wen Gu
  Mei-Ling Liu , Li-Zhi Zhang , Xiu-Ping Sun , Zhen-Ping Ma , Wen Gu and Xin Liu
  A dinuclear complex Cu2(bpca)2(H2O)2(Ag2(CN)3) (1) and a 1D complex [Cu2(bpca)2(H2O)2(Au(CN)2)2]n (2) (bpca = bis(2-pyridylcarbonyl)amide anion) have been prepared, structurally characterized and 2 has been magnetically characterized. The magnetic properties show an antiferromagnetic interaction between the two Cu(II) ions. Based on the Hamiltonian Hcirc = -2J Σ (Si · Si+1), best fitting for the experimental data leads to J = -0.045 cm-1.
  Jie Qu , Wen Gu and Xin Liu
  An octacyanometalate-bridged complex, [Ni(en)2(H2O)W(CN)8][Ni(en)3] · 2H2O, has been prepared and characterized and the magnetic properties studied. The complex was characterized using IR, elemental analysis and UV-Vis. The magnetic susceptibility measured over the range 1.8-300 K shows antiferromagnetic interaction.
  Hui Liu , Jin-Lei Tian , Wen Gu , Ying-Ying Kou , Li Feng , Xiao-Fang Ma , Dong-Dong Li , Shi-Ping Yan and Dai-Zheng Liao
  An oxamato-bridged heterobinuclear NiIICuII complex [Ni(cyclam)Cu(opba)]2 · 3DMSO (1) has been synthesized, characterized by elemental analysis, infrared spectra and magnetic susceptibility, where cyclam is 1, 4, 8, 11-tetraazacyclotetradecane and opba is o-phenylenebis(oxamato). The complex crystallizes in the triclinic system, space group P1 with a = 12.006(3) Aring, b = 12.783(3) Aring, c = 20.977(5) Aring, agr = 76.634(4)°, β = 75.172(4)°, γ = 80.818(4)° and Z = 2. According to X-ray crystallographic studies, the four-coordinate copper(II) atom is a slightly distorted planar geometry and is linked to nickel(II) through the exo-cis oxygen atoms of [Cu(opba)]2-; the six-coordinate nickel(II) center lies in a highly distorted octahedral environment. Magnetic susceptibility measurements of the complex in the temperature range 2-300 K indicate that the heterobinuclear NiIICuII units are coupled antiferromagnetically with J = -57.38 cm-1, gNi = 2.25 and gCu = 2.02.
  Pei-Pei Yang , Li Feng , Wen Gu , Xin Liu and Shi-Ping Yan
  A 1D complex [lcub[Cu2([12]aneN3)2(p-paa)(H2O)2](ClO4)2rcub[Cu2([12]aneN3)2(p-paa)2]]n ([12]aneN3 = 1,5,9-triazacyclododecane, p-paa = p-benzenebicarboxylate) has been synthesized and structurally characterized. The complex contains two different binuclear copper(II) moieties. One part includes a binuclear copper(II) unit and non-coordinated perchlorate anions. A neutral binuclear copper(II) part which forms a zigzag chain structure via the bridging p-paa ligand completes the unit-cell. Elemental analysis, IR, UV-Vis spectra and magnetic properties for the complex have also been determined. Magnetic susceptibilities in the solid state are measured over the temperature range from 77 to 300 K, showing a weak antiferromagnetic coupling with a best fit J1 = -3.09 cm-1, J2 = -5.279 cm-1, g = 2.099 and R = 1.226 times 10-5.
  Ying-Ying Kou , Guang-Jun Xu , Wen Gu , Jin-Lei Tian and Shi-Ping Yan
  Synthesis and pH-sensitive electrochemical properties of three complexes, [Cu(PD)3] · (ClO4)2 · 2.25CH3CN · 6H2O (1), [Cu(PD)(DMSO)Cl2] · DMSO · H2O (2) and [Co(PD)3] · (ClO4)2 · CH3CN · 2H2O (3) (PD=1,10-phenanthroline-5,6-dione), are reported. Single-crystal X-ray diffraction of the complexes suggest that the structure of 1 is orthorhombic, 2 triclinic and 3 orthorhombic. The electrochemical properties of free PD and the three complexes in phosphate buffer solutions in a pH range between 2 and 9 have been investigated using cyclic voltammetry. The redox potentials of these compounds are strongly dependent on the proton concentration in the range -0.3 V ∼ 0.4 V versus SCE (saturated calomel reference electrode). The reduction behavior of PD can be described from quinone species to semiquinone anion then to the fully reduced dianion. At pH < 4, the reduction of PD proceeds via 2e-/3H+ processes, while at pH > 4, the reduction of PD proceeds via 2e-/2H+. For all complexes, the N-N chelate PD ligand is electrochemically active and underwent step reduction via 2e-/2H+.
  Mei-Ling Liu , Wen Gu , Zhen-Ping Ma , Ping Zhu , Yue-Qiang Gao and Xin Liu
  Two new dinuclear copper(II) complexes, [Cu2(bpca)2(WO4) (H2O)2] · H2O (1) and [Cu2(bpca)2(MoO4) (H2O)2] · H2O (2) [bpca = bis(2-pyridylcarbonyl)amide anion], have been synthesized and their magnetic behavior investigated as a function of temperature. The structures of 1 and 2 have been determined by single-crystal X-ray diffraction. Complexes 1 and 2 are both 3D supramolecules with intermolecular hydrogen-bonding and p-p stacking interactions. The magnetic susceptibilities measured over the range 2-300 K show ferromagnetic interaction between the two copper(II) ions in 1, while there is antiferromagnetic interaction between the two copper(II) ions in 2. Based on the Hamiltonian written as Ĥ = -2JS1 .S2, best fitting for the experimental data leads to J = 0.557 cm-1 (1) and -77.2 cm-1 (2).
  Jiang-Yun Wang , Pei-Pei Yang , Wen Gu , Wen-Zhen Wang , Xin Liu and Dai-Zheng Liao
  A mononuclear ruthenium(III) complex containing ethylenediaminetetraacetate (edta), [Ru(Hedta)(Htrz)] · 4H2O (1) (Htrz = 1H-1,2,4-triazole), has been synthesized and the structure was determined by single-crystal X-ray diffraction. The complex crystallizes in the triclinic space group P1, with the unit cell parameters a = 7.212(3) , b = 9.873(4) , c = 13.806(6) , α = 91.945(6)°, β = 100.078(6)°, γ = 97.230(7) and Z = 2. The complex was also characterized by elemental analysis, IR, UV-Vis and ESR spectra. Cyclic voltammetry for the complex shows a ruthenium(III)/ruthenium(IV) oxidation and a ruthenium(III)/ruthenium(II) reduction within the range of -1.5-0.5 V. Magnetic susceptibility data give an effective moment of 1.81 B.M. at room temperature.
  Ying-Ying Kou , Jin-Lei Tian , Dong-Dong Li , Hui Liu , Wen Gu and Shi-Ping Yan
  A dimeric dichloro-bridged copper(II) complex [Cu2(pdon)2Cl4] · 2DMF (1) and two mononuclear copper(II) complexes [Cu(pdon)(DMSO)Cl2] · DMSO · H2O (2) and [Cu(pdon)3] · (ClO4)2 · 2.25CH3CN · 6H2O (3) (pdon = 1,10-phenanthroline-5,6-dione) have been synthesized and characterized. Variable-temperature magnetic susceptibility studies indicate the existence of weak anti-ferromagnetic coupling in the binuclear complex. The interaction of these complexes with CT-DNA (calf thymus DNA) has been studied using absorption and emission spectral methods. The apparent binding constants (Kapp) for 1, 2 and 3 are 5.20 times 105, 2.68 times 105 and 7.05 times 105 M-1, respectively, showing moderate intercalative binding modes. All of these complexes cleave plasmid DNA to nicked DNA in a sequential manner as the concentration or reaction time is increased. The cleavage mechanism between the complex and plasmid DNA is likely to involve singlet oxygen 1O2 and •OH as reactive oxygen species.
  Jiang-Yun Wang , Wen Gu , Wen-Zhen Wang , Xin Liu and Dai-Zheng Liao
  A ruthenium(III) complex containing ethylenediaminetetraacetate (edta), [{Ru(Hedta)}2(Pyz)] · 8H2O (1) (Pyz = pyrazine), has been synthesized by the reaction between K[Ru(Hedta)Cl] · 1.5H2O and pyrazine. The structure of the complex was determined by single X-ray diffraction. Complex 1 crystallizes in the triclinic space group P -1 with a = 7.293(9) Å, b = 10.575(14) Å, c = 12.742(16) Å, α = 104.044(19)°, β = 91.893(19)°, γ = 93.35(2)°, Z = 1. The product was also characterized by IR, UV-Vis, EPR spectrum and magnetic techniques.
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