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Articles by Dai-Zheng Liao
Total Records ( 6 ) for Dai-Zheng Liao
  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.
  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.
  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.
  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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