聚吡唑硼酸盐钒氧配合物的合成及对苯酚红催化溴化活性

在室温溶液反应中设计合成了一个新的三聚-4碘代吡唑硼酸的钒氧配合物:[VO(C₆H₉O₂)(Tp^4I)]·2H₂O(Tp^4I=三聚-4-碘代吡唑硼酸盐)。 通过元素分析、红外光谱、紫外光谱、热重、X射线粉末和单晶衍射等技术手段对其结构进行了表征。 以苯酚红为底物,在过氧化氢的存在下,进行仿生催化溴化的研究。 结构分析表明,中心金属钒为6配位,与配位原子形成了一个八面体几何构型。 配体三聚4-碘吡唑硼酸盐(Tp^4I)采取三齿螯合配位模式。 在仿生催化溴化实验中,配合物对苯酚红的溴化氧化反应表现出良好的催化活性,催化该反应体系的反应速率常数达到k=2.826×10² (mol/L)^-2·s^-1。 同时将此反应体系应用于过氧化氢的检测。     

Investigation into Experimental Conditions and Factors for Cyclohexane Oxidation with VO（acac）2

The catalytic activity of VO（acac）2 for the cyclohexane（Cy） oxidation was studied. The effects of various parameters, such as the amounts of H202, HNO3, H20 and Cy were investigated. The highest total turnover num- ber（TON） is 234, which can be increased to 353, 342 and 403, respectively with the adding of o-phthalic, m-phthalic or p-phthalic acid. A reaction mechanism was also supposed primarily.     

Ordered porous metal oxide semiconductors for gas sensing

This review gives a comprehensive summary about the porous metal oxides with focus on the synthesis methods, structure related properties, as well as the modification strategies for gas sensing improved performances.     

Laser micro-processing of cardiovascular stent with fiber laser cutting system

A metallic cardiovascular stent cutting system based on fiber laser was designed in this study. In order to achieve the cutting of stent, the main modules and the key technologies were analyzed and achieved. Then with the cutting system, the kerf width size was studied for different cutting parameters including laser output power, pulse length, repeat frequency, cutting speed and assisting gas pressure. Finally, a high quality of cutting of 316L stainless steel cardiovascular stent was achieved.     

微型金柱腔中原位成型制备微孔泡沫

 报道了在μm量级圆柱状金柱腔中原位成型制备微孔泡沫的方法。在直径400 μm、长度700 μm、壁厚20 μm、两端开口的金柱腔中原位成型成功制备出密度为50 mg·cm^-3、蜂窝直径不超过1 μm的多元丙烯酸酯聚合物微孔泡沫。干燥过程中泡沫没有明显收缩,在柱腔中填充紧密,无需后续机械加工。     

高轴压和围压共同作用下受频繁冲击时含铜蛇纹岩能量演化规律

探讨高轴压和围压共同作用下频繁冲击扰动试验过程中伴随主要能量的种类,并推演冲击扰动前后弹性能、塑性能等能量的计算公式;采用预加载围压、高轴压、0.5 MPa冲击气压模拟深部岩体承受的水平应力、垂直高应力及爆破开挖扰动的影响开展动力学试验,并基于试验结果分析含铜蛇纹岩的动力学特征及能量演化规律。研究结果表明:含铜蛇纹岩能承受的扰动冲击次数随轴压增大而减小,随围压增大而增大,且动态峰值应力随扰动冲击次数增加而减小;随扰动冲击次数的增加,岩样伴随的弹性能先增大后趋于减小,伴随的塑性能呈增大的趋势发展,反射能和入射能的比值与透射能和入射能比值的变化规律相反,前者呈增大趋势,后者呈减小趋势;单位体积吸(释)能随扰动冲击次数的增加呈下凸曲线趋势变化,其均值随围压增大先减小后增大,随轴压增大而减小。     

Viscosity Coderivatives and Their Limiting Behavior in Smooth Banach Spaces

This paper concerns with generalized differentiation of set-valued and nonsmooth mappings between Banach spaces. We study the so-called viscosity coderivatives of multifunctions and their limiting behavior under certain geometric assumptions on spaces in question related to the existence of smooth bump functions of any kind. The main results include various calculus rules for viscosity coderivatives and their topological limits. They are important in applications to variational analysis and optimization.     

Syntheses, spectra and crystal structures of a series of Mo/S(O) complexes containing oxalate ligand

Two Mo/S complexes: K₆[Mo₂O₂S₂(C₂O₄)₂-(ClPO₃)₂]·H₂O (1) and K₆[Mo₂O₃S(C₂O₄)₂(ClPO₃)₂]·3H₂O (2) containing oxalate ligand were prepared by the reaction of (NH₄)₂MoS₄ and potassium oxalate by adding a small amount of H₃PO₄ to adjust the value of pH in the system of methanol and water under an atmosphere of pure nitrogen at ambient temperature and characterized by means of elemental analysis, IR, and UV-Vis. Results of the analysis reveal that crystals of the complex 1 are orthorhombic, space group Pbcn, a = 4.6370(2) nm, b = 0.7549(2) nm, c = 1.3888(4) nm, V = 4.861(2) nm³, Z = 8, M = 945.49, Dc = 2.58 g/cm³, μ = 2.625 cm⁻¹, R = 0.063, and wR = 0.075. In addition, their spectral properties were also discussed. Translated from Chem. Res. Appl., 2006, 18(4) (in Chinese)     

Nonconvex differential calculus for infinite-dimensional multifunctions

The paper is concerned with generalized differentiation of set-valued mappings between Banach spaces. Our basic object is the so-called coderivative of multifunctions that was introduced earlier by the first author and has had a number of useful applications to nonlinear analysis, optimization, and control. This coderivative is a nonconvex-valued mapping which is related to sequential limits of Fréchet-like graphical normals but is not dual to any tangentially generated derivative of multifunctions. Using a variational approach, we develop a full calculus for the coderivative in the framework of Asplund spaces. The latter class is sufficiently broad and convenient for many important applications. Some useful calculus results are also obtained in general Banach spaces.This research was partially supported by the National Science Foundation under grants DMS-9206989 and DMS-9404128, by the USA-Israel grant 94-00237, and by the NATO contract CRG-950360.     

Synthesis,Antibacterial Activities and Nuclease Properties of Ternary Copper(II) Complex Containing 2‐(2′‐Pyridyl)benzothiazole and Glycinate

A new ternary complex [Cu(PBT)(Gly)(H₂O)]ClO₄ (PBT=2‐(2′‐pyridyl)benzothiazole, and Gly=glycinate) has been synthesized and characterized by elemental analysis, molar conductivity, and IR methods. The complex, structurally characterized by single‐crystal X‐ray crystallography, shows a slightly distorted square‐pyramidal coordination geometry in which two nitrogen atoms of PBT and the carboxylate oxygen atom O and the amino nitrogen atom N of Gly bind at the basal plane, a water molecule is coordinated at the apical position. The complex, Cu(ClO₄)₂ and free PBT were each tested for their ability to inhibit the growth of two Gram(?) (Escherichia coil, Salmonella) and two Gram(+) (Bacillus subtilis, Staphylococcus aureus) microorganisms. The complex showed good antibacterial activities against the microorganisms compared with free PBT and Cu(ClO₄)₂. The interaction between the complex and calf thymus DNA in aqueous solution was investigated using electronic spectroscopy, fluorescence spectroscopy, circular dichroic spectroscopy, and viscosity measurements. Results suggest that the complex could bind to DNA by an intercalative mode. In addition, the result of agarose gel electrophoresis showed that the complex can cleave the plasmid DNA by hydroxyl radicals and singlet oxygen‐like species under the condition of physiological pH and room temperature.