四个酰基硫脲衍生物及其配合物的合成与表征

本文报道了四个Ｎ－酰基硫脲衍生物及其Ｃｕ＾２＋，Ｎｉ＾２＋，Ｃｄ＾２＋，Ｓｎ＾４＋配合物的合成。用质谱、红外光谱、紫外光谱对它们进行了结构、性质表征。配体与金属离子配位主要是通过硫原子进行，配合物都是非离子型的。     

室温无溶剂条件下醋酸锌催化的Knoevenagel缩合反应

以醋酸锌作为催化剂, 在室温无溶剂条件下催化芳香醛与活泼亚甲基化合物发生Knoevenagel缩合反应, 其反应条件温和, 产率最高可达100%, 产品纯度好, 操作和后处理简单.     

N-苯基苯二甲酰亚胺和2-苯基喹噁啉晶态分子动力学行为研究

本文在晶体结构分析的基础上, 对二个芳香杂环高聚物模型化合物N-苯基苯二甲酰亚胺和2-苯基喹噁啉分子的原子热振动参数进行分析, 结果表明N-苯基苯二甲酰亚胺晶态分子基本上为刚性分子, 而2-苯基喹噁啉分子的热振动应包含分子内取代苯基的内旋转运动, 其平均平方振幅为53(25) deg~2。     

O-烷基,O-芳基硫代磷酰取代硫脲和O-烷基硫代磷酰-双-取代硫脲的研究(Ⅱ)

用硫氰酸钾与硫代磷酰氯制备了硫代磷酰异硫氰基酯和二异硫氰基酯,并以其与不同胺反应,合成了硫代磷酰取代硫脲和硫代磷酰-双-取代硫脲两系列20个新的有机磷化合物,经1HNMR、IR及元素分析确定了它们的化学结构,测定了它们的生物活性。结果表明只有O-异丙基,O-(4-甲基-2-硝基苯基)-N''-萘基硫代磷酰硫脲(PD-1)具有较好的杀菌活性。     

One-dimensional α-MnO2: Trapping chemistry of tunnel structures, structural stability, and magnetic transitions

Highly crystalline one-dimensional (1D) α-MnO₂ nanostructures were synthesized by a hydrothermal method. All samples were characterized by X-ray diffraction, transmission electron microscope, thermogravimetric and differential scanning calorimeter, and infrared spectroscopy. During the formation reactions, the tunnel structure of 1D α-MnO₂ was simultaneously modified by NH₄⁺ species and water molecules. The amount of NH₄⁺ species that were trapped in the tunnels is almost independent on the reaction temperature, while the total water content increased with the reaction temperature. The average diameter of α-MnO₂ nanorods increased from 9.2 to 16.5 nm when the reaction temperature increased from 140 to 220 °C. 1D α-MnO₂ was destabilized by a subsequent high-temperature treatment in air, which is accompanied by a structural transformation to 1D Mn₂O₃ of a cubic structure. At low temperatures, all 1D α-MnO₂ nanorods showed two magnetic transitions that were characterized by a decreased Néel temperature with rod diameter reduction. According to the effective magnetic moments experimentally measured, Mn ions presented in the nanorods were determined to be in a mixed valency of high spin state Mn⁴⁺/Mn³⁺.     

The Synthesis of Some New N‐[1‐(2,5‐Dichlorophenyl)‐5‐Methyl‐1,2,3‐Triazol‐4‐yl]‐Carbamic Acid Ester Derivatives

The synthesis of some new N‐[1‐(2,5‐dichlorophenyl)‐5‐methyl‐1,2,3‐triazol‐4‐yl]‐carbamic acid ester derivatives are reported in this paper. The yielded products 6a‐l were confirmed by Elemental analyses, NMR, MS, and IR spectra.     

The effect of the third component on butadiene–propylene alternating copolymerization catalyzed by vanadium–aluminum system

The effects of five ethers and four AliBu₂OR's with varied R' on butadiene–propylene alternating copolymerization were investigated. It was found that by adding the proper third component, both the conversion and the catalytic efficiency could be increased. The effect of the third component on the valence state of vanadium ion was also studied. A model of the active center of the ternary-component catalyst system was proposed.     

Application of algebraic method to the high overtones of C6H6 and C6D6

Both the spectra and infrared transition strengths of C₆H₆ and C₆D₆ for the C? H stretching overtones up to as high as v = 10 are described in high precision with few parameters (six for the spectra and four for the transition strengths) by the Iachello–Oss algebraic model. The Hamiltonian model is solved in the symmetry adapted bases, which are constructed by the symmetrized boson representation (SBR) technique. The results show that the combination of the algebraic method and SBR technique is a powerful method for describing vibrations of large molecules and high overtones. © 2004 Wiley Periodicals, Inc. Int J Quantum Chem, 2005     

Organometallic reagents in organic synthesis—V: An organocuprate conjugate addition—Aldol condensation synthetic procedure for sequential formation of two carbon-carbon bonds

The enolates produced from the conjugate addition reaction of lithium dialkylcuprates with α,β- unsaturated ketones react with aldehydes in the presence of zinc chloride to give overall β-alkyl α-hydroxyalkyl addition to the original alkene. Reaction of these enolates with carbon dioxide and ethyl formate is also reported.     

Cadmium selenide quantum wires and the transition from 3D to 2D confinement

Soluble CdSe quantum wires are prepared by the solution-liquid-solid mechanism, using monodisperse bismith nanoparticles to catalyze wire growth. The quantum wires have micrometer lengths, diameters in the range of 5-20 nm, and diameter distributions of +/-10-20%. Spectroscopically determined wire band gaps compare closely to those calculated by the semiemipirical pseudopotential method, confirming 2D quantum confinement. The diameter dependence of the quantum wire band gaps is compared to that of CdSe quantum dots and rods. Quantum rod band gaps are shown to be delimited by the band gaps of dots and wires of like diameter, for short and long rods, respectively. The experimental data suggest that a length of ca. 30 nm is required for the third dimension of quantum confinement to fully vanish in CdSe rods. That length is about six times the bulk CdSe exciton Bohr radius.