基于双氢青蒿素-巯基化合物电化学探针对巯基化合物的检测

在20%乙醇+B-R缓冲溶液(pH7.2)介质中,利用双氢青蒿素与谷胱甘肽、6-巯基嘌呤及L-半胱氨酸作用,分别于-1.05,-1.20和-1.10V处获得双氢青蒿素-巯基化合物复合物灵敏的还原峰,该还原峰在一定浓度范围内随着巯基化合物以及双氢青蒿素浓度的增加而增大,因此可将其作为电化学探针应用于上述3种巯基化合物以及双氢青蒿素的检测,为检测巯基化合物提供了一种新方法;探讨了复合物形成的电极反应机理,利用纳米金与巯基的共价作用阻断巯基参与形成复合物,证实了复合物是由双氢青蒿素中的碳自由基与巯基化合物巯基中的硫原子通过SC键结合形成。     

Mesomorphic Complex Compounds

This paper presents a review of liquid crystalline complexes whose central atoms are d elements (Group IB, IIB, IIIB, or VB atoms), f elements (lanthanides), and s or p elements. The possibilities of constructing coordination compounds with mesomorphic properties are discussed in view of the central atom coordination number and the nature of the ligand.     

基于DNA-甲苯胺蓝生物聚合离子膜的多环有机物电化学传感器的研究

利用DNA与小分子之间的相互作用,以DNA/壳聚糖生物聚合离子膜固定电活性小分子,制备了DNA-甲苯胺蓝/壳聚糖聚合离子复合膜修饰电极,并利用多环有机物与染料分子对DNA特异结合的竞争关系,构筑了多环有机物非试剂添加型DNA电化学生物传感器。以盐酸四环素为模式分子,利用循环伏安法和方波伏安法研究了该修饰电极的电化学特性以及该电极对盐酸四环素的电化学响应,结果表明,DNA和甲苯胺蓝成功地固定在电极表面,电极表面的甲苯胺蓝保持了很好的电化学活性。利用紫外-可见分光光度法研究了电极对盐酸四环素响应的作用机理。该传感器的线性范围为2.5~100μmol·L-1。     

Phosphorus-Nitrogen Compounds as Complex Ligands

Abstract

Amino(imino)phosphanes(σ²-phosphazenes) of the type N[sbnd]P[dbnd]N- are useful complex ligands.     

Crystal Chemistry of Complex Carbides and Related Compounds

Numerous metal carbides can be discussed in a rather uniform way by means of structural features, mainly characterized by the mode of linking of octahedral and occasionally trigonal prismatic [M₆C] groups (M = transition element). From this point of view perovskite carbides (M₃M′C, M′ = another transition or A-group element) and derivatives, β-Mn carbides (M₃M′₂C), κ-carbides, carbides with V₃AsC- and Cr₂AlC type structures and derivatives, η-carbides (M₃M′₃C) and carbides having the filled Mn₅Si₃ type structure will be treated. The high stability of these complex carbides is due to the strong bonding M? C and additional bonding of M? M′ atoms forming an ordered parent lattice. Besides the interstitial principle of filling of lattice holes (by isolated carbon atoms), substitution with A-group elements may also take place. Thus in borocarbides extended structural elements occur.     

The Distribution of Charge in Complex Compounds

The charges on metal atoms and ligands in complex compounds of transition metals may be calculated theoretically or measured empirically, but there is no reliable method of doing either. This review is concerned mainly with two experimental methods, dipole moment measurement and X-ray photoelectron spectroscopy, applied to tertiary phosphate and such complexes of the heavier transition metals. It is concluded that the charge is rarely greater than ±0.3e and that some so-called neutral or positive ligands, e.g. N₂ or NO⁺, may carry more negative charge in a complex than formally anionic ligands such as H^?. Small ligands of high formal charge, e.g. O^2?, NR^2?, and N^3?, appear to carry no more negative charge than Cl^?, but monoanionic ligands vary greatly in their capacity to contribute to the dipole moments. The ligands NO, CO, PF₃, CH, and H^? are all nearly neutral to slightly negative, whereas pyridines, tertiary phosphanes, etc. are the most strongly positively charged.     

Spiroheterocyclic Compounds Based on 2-Bromobutanolides

Bromination of ethyl 5-alkoxymethyl-2-oxotetrahydrofuran-3-carboxylates afforded ethyl 5-alkoxymethyl-3-bromo-2-oxotetrahydrofuran-3-carboxylates which reacted with thiourea, substituted thioureas, benzimidazole-2-thiol, and benzothiazole-2-thiol to give new heterocyclic compounds.__________Translated from Zhurnal Organicheskoi Khimii, Vol. 41, No. 4, 2005, pp. 590–593.Original Russian Text Copyright © 2005 by Kochikyan.     

基于有机硼化合物的氟离子化学探针

本文综述了有机硼化合物在氟离子探针领域的研究进展.介绍了基于三芳基硼化合物、硼酸和硼酸酯的有机硼化合物在氟离子检测中的应用,评述了这些化合物的结构和检测性能之间的关系,讨论了检测机理,即有机硼化合物中硼原子空的pπ轨道使其作为路易斯酸能够选择性地结合氟离子,硼原子与氟离子的结合破坏了硼中心与芳香取代基的pπ-π共轭,引起有机硼化合物光物理性质的变化,从而实现对氟离子的高选择性检测.最后提出了有机硼化合物作为氟离子探针存在的一些问题,并展望了有机硼化合物在氟离子探针领域的研究和发展方向.     

掺Pb对Bi系超导体性能影响的研究

在使用聚合物-金属复合物(PMC)新型合成工艺制备出性能优良的BiSrCaCuO超导体的基础上,利用PMC法易于掺杂的特点,合成了Bi2-x(Pb)xSr2Ca2Cu2Oy超导体,实验结果表明,掺Pb后,合成时间进一步缩短,高Tc相的形成速率是不掺Pb的4~6倍,所得超导体为单相,掺Pb不影响体系的微观均匀性。     

用聚合物-金属复合物法合成BiSrCaCuO超导体的研究

通过使用聚合物-金属复合物的新型合成工艺,制备出性能优良的BiSrCaCuO超导体,超导体内高Tc和低Tc相并存,其Tce为114.7 K,Tco为84.0 K。探索了各金属离子的配比、聚合物与无机离子的质量比,以及各种不同的热处理条件对超导体中高Tc相和低Tc相的比例的影响。对聚合物-金属混合物的前体液进行了结构分析。实验结果表明,聚合物与金属离子形成了复合结构,聚合物-复合物合成工艺具有微观均匀性的特点。     

A 1D Double Stranded Chain Complex Based on Barium Ion and 1,3,5-Triazine

A new coordination compound [Ba(OBPT)2(H2O)2]·H2O was obtained at room temperature by the reaction of 4,6-bis(2-pyridyl)-1,3,5-triazin-2-ol(HOBPT) with BaCl2.It was characterized by elemental analysis,FTIR,TG analysis,powder X-ray diffraction analysis and single-crystal X-ray diffraction analysis.The complex crystallizes in the monoclinic P21/n space group,with a = 16.325(1),b = 6.7977(5),c = 24.164(2) ,β = 104.009(1),V = 2601.8(3) 3,Z =4,C26H22BaN10O5,Mr = 691.88,Dc = 1.766 g/cm3,F(000) = 1376 and μ(MoKα) = 1.587 mm-1.The final R = 0.0282 and wR = 0.0724 for 5095 observed reflections with I > 2σ(I) and R = 0.0312 and wR = 0.0744 for all data.In the complex,the barium ion is ten-coordinated with six nitrogen atoms from two ligands,two deprotonated hydroxyl oxygen atoms from another two ligands and two coordinated water molecules to form a double stranded chain.The extensive supramolecular interac-tions lead to the formation of an infinite 2D framework.     

Macroheterocyclic Compounds Based on Nitro- and Chloro-1,3-indandiones

Macroheterocyclic compounds of symmetrical structure were prepared by reactions of 4- and 5-nitro-1,3-indandions and 4-chloro-1,3-indandione with m-phenylenediamine.     

Synthesis of Functionalized Bicyclic Compounds Based on 2-(1-Arylethylidene)malononitriles

Russian Journal of Organic Chemistry - New tetrahydroisoquinoline-5,7-dicarbonitrile derivatives have been synthesized by piperazine hydrate-catalyzed reaction of acetoacetanilide with...     

Benzotriazole-Chromium Trioxide Complex A Versatile Oxidant of Organic Compounds

Benzotriazole has been found to complex with chromium trioxide to produce a versatile new oxidant. This complex is capable of oxidizing primary alcohols to carboxylic acids, secondary alcohols to ketones, and bringing about the allylic oxidation of olefin substrates.     

Shi Epoxidation:A Great Shortcut to Complex Compounds

Shi epoxidation provides an extremely powerful tool to access optically active epoxides,which undoubtedly belongs to one of the earliest and most successful org...     

2D—HOHAHA和ROESY方法归属复杂天然有机化合物的NMR谱线

用同核化学位移相关谱及旋转坐标系中的同核化学位移相关谱和旋转坐标系中的同核NOE实验等新的二维核磁共振方法对首次从西洋参叶中分离出的Ocotillol型皂甙(OTS)的~1H化学位移进行了完全归属,为OTS分子溶液中的三维空间结构研究提供了可靠的结构参数.     

铽配合物[Tb(m-MBA)3phen]2·2H2O的有机电致发光

将稀土铽配合物[Tb(m MBA)3phen]2·2H2O作为发光材料应用于有机电致发光。把铽配合物掺杂在PVK中经甩膜制得发光层,并分别用AlQ和PBD作为电子传输层制作了两类有机电致发光器件。器件1:ITO PVK:[Tb(m MBA)3phen]2·2H2O PBD LiF Al;器件2:ITO PVK:[Tb(m MBA)3phen]2·2H2O AlQ LiF Al,研究了两种器件的电致发光性能,并通过选择AlQ的厚度得到了发光性能较好的用AlQ作为电子传输材料的器件,其最大亮度在20V时达到140cd·m-2。     

Synthesis of Peroxides Based on Polyfluorated Polycarbonyl Compounds

Russian Journal of General Chemistry - The reactions of polyfluorinated di- and tetracarbonyl compounds with tert-butyl hydroperoxide proceeds at one or several carbonyl groups, depending on the...