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Articles by Shi-Ping Yan
Total Records ( 8 ) for Shi-Ping Yan
  Dong-Zhao Gao , Ya-Qiu Sun , Dai-Zheng Liao , Zong-Hui Jiang and Shi-Ping Yan
  Two metal-nitroxide complexes, [Cu(IMPhenCOO)(CH3OH)]2 · (NO3)2 (1) and [Co(NIT2Py)(H-2,5-PDA)2] · 0.5CH3OH · 2H2O (2) (IMPhenCOOH = 2-carboxyl-9-(4,4,5,5-tetramethylimidazoline-1-oxyl-2-yl)-1,10-phenanthroline, NIT2Py = 2-(2'-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide and H2-2,5-PDA = pyridine-2,5-dicarboxylic acid), have been synthesized and structurally characterized by X-ray diffraction. Complex 1 exists as discrete binuclear molecules and each copper(II) is five-coordinate with one tridentate radical ligand (IMPhenCOOH), the other radical ligand through one carboxyl oxygen and one methanol molecule. Complex 1 is the first structurally characterized complex containing the phenanthroline-substituted nitroxide radical. In 2, the Co(II) is six-coordinate with one radical ligand (NIT2Py) and two bidentate pyridine-2,5-dicarboxylate anions.
  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+.
  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.
  Jing Qian , Jin-Lei Tian , Li Feng , Wen Gu , Xiao-Jun Zhao and Shi-Ping Yan
  Two new µ-carboxylato-bridged binuclear copper(II) complexes [Cu2(bpea)2 (µ-C2O4)](ClO4)2 · H2O (1) and [Cu2(bpma)2 (µ-ta)](ClO4)2 · H2O (2) (bpea = N,N-bis(2-pyridylmethyl)ethylamine; bpma = N,N-bis(2-pyridylmethyl)methylamine; ta = terephthalate dianion) have been synthesized and structurally determined by X-ray diffraction. Complex 1 is crystallized in a monoclinic space group C2/c with unit cell parameters a = 21.539(17) Å, b = 12.608(10) Å, c = 13.117(11) Å, β = 96.788(13)°. In 1, each Cu(II) is five-coordinate, square-pyramidal geometry with a CuN3O2 donor set. Complex 2 is crystallized in a monoclinic space group P21/n with unit cell parameters a = 11.346(3) Å, b = 15.418(4) Å, c = 11.958(3) Å, β = 116.519(4)°. In 2, each Cu(II) also is square-pyramidal CuN3O2 core, where three N- and one O-donors are equatorial and an oxygen of the bridging ligand occupies the axial site with a weak link. Elemental analyses, IR, UV and EPR spectra of the complexes were determined.
  Yue Ma , Na Zhou , Xiao-Ping Chen , Dong Cao , Dai-Zheng Liao and Shi-Ping Yan
  A supramolecular assembly of [p-MePyNN]2[Au(CN)2]2 (1) (p-MePyNN+ = 2-(4-N-methylpyridinium)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazo-1-oxyl-3-oxide radical cation) has been synthesized from the combination of p-N-methylpyridinium nitronyl nitroxide radical cations and [Au(CN)2]- anions, and characterized structurally as well as magnetically. The compound crystallizes in the orthorhombic, space group P212121, with two independent p-MePyNN+ cations separated from each other by the dimer [Au(CN)-2]2. The magnetic study shows that the larger steric hindrance of [Au(CN)2]- anion influences the magnetic interactions between the radical cations, with very weak antiferromagnetic interactions.
  Chun Yang , Qing-Lun Wang , Guo-Tao Tang , Chao Wang , Shi-Ping Yan and Dai-Zheng Liao
  Reaction of Co(OAc)2 · 4H2O with N-(2-hydroxybenzyl)salicylaldimine (H2La) in dimethylformamide (DMF)-H2O yields a linear trinuclear mixed valence complex [CoIII(μ-La)(μ-Lb)(μ-OAc)]2CoII · 2DMF (1). Here, HLb is salicylaldimine, which is afforded by an in situ transformation of H2La via cleavage of the C-N bond. Complex 1 has been characterized by X-ray crystallography as well as elemental analysis, UV-Vis, and IR spectroscopy. The cathodic and anodic responses of 1 in DMF appeared at -1.46 V (CoIII → CoII, quasi-irreversible) and +0.99 V (CoII → CoIII, irreversible) versus saturated calomel electrode, respectively. The magnetic behavior of 1 has been analyzed by the one-ion approximation with spin-orbit coupling in Oh symmetry giving λ = -121 cm-1.
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