含有苯基的青蒿素类似物的合成

为考察引入苯基的青蒿素类似物的抗疟活性, 我们设计了化合物7. 从苯甲醛出发, 经过10步反应, 制得光化学反应底物环烯醚16. 16经光氧化反应得到非期望产物17. 17的化学结构由X射线晶体衍射法测定.     

气相色谱法测定水中的松节油

研究了测定水中松节油的气相色谱法.采用二硫化碳萃取,DB-5型毛细管柱分离,氢火焰检测器(FID)检测水中松节油的含量.松节油浓度在1. 00～25. 0 mg/L范围内与色谱峰面积呈良好的线性关系,线性相关系数r=0. 9996.加标回收率为86. 3%～91. 3%,测定结果的相对标准偏差为8. 7%(n=6).该法可满足地表水环境质量标准的要求.     

具有生物活性的喹啉类化合物的最新进展

喹啉类化合物具有优良的生物、生理活性. 在医疗保健和植物保护方面, 喹啉类化合物显示了广泛的应用和发展前景. 综述近几年来喹啉类化合物在医药和农药方面的研究最新进展.     

可降解抑菌的蓖麻油改性水性聚氨酯复合膜的制备和性能

本研究采用水性聚氨酯(WPU)为复合材料基材,通过蓖麻油(C.O)改性,加入天然高分子抗菌物质壳聚糖(CTS),以及具有较好降解性的羟乙基纤维素(HEC),制备了一种环保抑菌可降解抑菌C.O-WPU/CTS/HEC膜.研究结果表明,CTS与HEC的含量均为1.00%时,抑菌性能达到最高;且C.O含量达到8.33%时,吸水率低于10.00%,接触角达到99.47°.抑菌实验表明C.O-WPU/CTS/HEC膜具有良好抑菌性和抑菌持久性.C.OWPU/CTS/HEC膜的生物降解实验显示,降解后(CO_(2exp)/CO_(2the))_(max)=56.30%,(w_(loss))_(max)=74.40%.同时,降解前后的扫描电镜(SEM)图片显示C.O-WPU/CTS/HEC膜具有可降解性.红外光谱分析(FT-IR)显示制备了一种性质稳定的C.O-WPU/CTS/HEC复合材料.C.O-WPU/CTS/HEC膜在实际水体中的抑菌实验说明该材料有较好的应用前景.     

双液系的气液平衡相图实验装置的改进

沸点仪是绘制双液系气液平衡相图的常用实验装置 ,目前教科书中该实验装置如图 1所示[1～ 4 ] 。这种沸点仪的缺陷是加热电阻丝允许的电压不能超过 40V[4 ] ,否则电阻丝易被烧断。在实验过程中 ,常有学生由于调压过大烧断电阻丝的情况。另外 ,该实验有许多样品易燃 ,在烧瓶内通电后的电热丝与易燃样品直接接触 ,存在安全隐患。图 1　沸点仪装置图1.冷凝器 ;2 .温度计 ;3 .加热导线 ;4.气相冷凝液取样口 ;5.气相冷凝液贮存槽 ;6.蒸馏瓶 ;7.液相取样口 ;8.电加热丝图 2　改进后的沸点仪装置图1.冷凝器 ;2 .温度计 ;3 .气相冷凝液取样口 ;4.气…     

甲氰菊酯的热容及热力学性质的研究

采用精密自动绝热量热测量了自已合成并提纯到0.9916(摩尔分数)的甲氰菊酯在80~400K温区的热容.在此温区发现一固液熔化相变.其熔化温度、摩尔熔化焓、摩尔熔化熵分别为:(322.476^+~-0.012)K,(18.57^+~-0.29)kj.mol^-^1,(57.59^+~-1.01)J.K^-^1.mol^-^1.报道了该物质每隔5K的热力学函数值,用热重法研究了该化合物的热分解,对试样的化学纯度进行了量热研究。     

电沉积工艺对Mg-Ni储氢合金的电化学性能的影响

用电沉积的方法制备了镁 镍储氢合金,探讨了电沉积条件对合金的电化学性能的影响.XRD显示沉积层中含有非晶态Mg Ni相和微晶态Mg相.AAS分析表明沉积合金中Mg的摩尔分数达 8. 57%.合金的放电容量最高为 75. 547mA·h·g-1.     

偶氮二甲酸乙酯促进的叔胺脱氢以及与磺酰叠氮的串联反应

J.Am.Chem.Soc.2008,130,14048～14049叔胺脱氢生成烯胺的反应一直是有机化学中的难点之一,文献报道的方法条件苛刻、选择性差.寻找一种高效、温和的新方法来实现叔胺的脱氢反应在有机合成化学中十分重要.同时,磺酰和磷酰取代的脒类化合物由于具有潜     

光栅立体影像的技术进展

人类处于三维世界之中.用我们一双明亮的眼睛能够辨别周围物体所处的相对空间位置,感受这美妙的立体世界.但是,至今广泛采用的照相术,只能记录平面影像,缺乏真实感.立体影像是继平面影像的自然演进.大约30年前,东京大学教授大越孝敬在他1976年的著作《三次元画像工学》里提到"重建空间影像是人类的梦想".其实,这个梦想早已开始,F.E.Ives于1903年已发表利用光栅的立体影像原理.光栅立体影像的应用发展始于1940年,至今已有60多年历史,但一直都未能普及化,一定有其中的原因.     

结构简单的小分子硫烯化合物为新型手性配体的铑催化的不对称1,2-加成反应

Angew.Chem.Int.Ed.2012,51,780～783手性α-季碳羟基酸及α-季碳羟基酮是有机合成和药物合成中非常有用的分子,它们的骨架结构广泛存在于天然产物分子和生物活性分子中,由于分子中的手性季碳结构,如何高效构建它们一直是有机合成中一个很具挑战性的课题.中国科学院上海药物研究所徐明华等以课题组新近发展的结构极其简单的直链线形小分子硫烯化合物(仅两步简单反应"一锅"合成,Org.Biomol.Chem.2012,10,1764～1768,封面文章)为新型手性配体,成功实现了各种芳     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

酞菁染料的金属化和溴化与光物理影响的研究

以α位(2,4-二特戊基)苯氧基邻苯二腈作为环合前体,制备了多种金属酞菁,产物经元素分析、紫外、红外、核磁氢谱等分析手段进行表征.并选择了部分酞菁进行溴化,其中着重研究了不同中心金属以及溴化对染料Q带吸收的影响.结果表明,酞菁染料的金属化对于其Q带吸收影响很大,多数染料金属化后会出现蓝移,而选择合适的条件进行溴化,可以使得金属酞菁的Q带吸收出现一定程度的红移,其中部分溴化金属酞菁的吸收波长与光信息产业中使用的近红外激光器很接近,具有潜在的实用价值.     

室温氧化还原反应制备AgCuSe三元纳米棒

AgCuSe nanorods were prepared at room temperature by a redox reaction. The as-prepared product was characterized by X-ray powder diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy.X-ray powder diffraction shows that the as-prepared product is the tetragonal phase of AgCuSe. Transmission electron microscopy shows that the sample consists of nanorods with a diameter varying from 5 nm to 20 nm and a length varying from 200 nm to 600 nm. X-ray photoelectron spectroscopy shows that the purity of the sample is high. The formation mechanism of AgCuSe and the growth mechanism of AgCuSe nanorods were discussed.Thermodynamic calulations show that the final product in the synthetic system is pure AgCuSe. The solvent ethylenediamine did not only acts a didentate ligand to form relatively state Ag + and Cu + complexes, but also dissolved Se and enhanced the reactivity of Se. It played an important role in controlling the nucleation and growth of AgCuSe nanorods.     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Time,gravity and the exterior angle of parallelism

Applying calculus to the horizontal and vertical unit hyperbolas we derive the obtuse exterior and the acute angle of parallelism formulas for the arc length of a unit circle. When the analogous arc length of a hyperbola is figured, we further define metric distance with radian measure. Employing a non-conventional velocity of light formula, we explain several aspects of physics with a logical geometry. The hyperbolic geometry Lobacevskii angle of parallelism is mathematically measured to agree with the physical measure, without using the gravitational constant, but rather the electromagnetic spectrum and geodesics. Space is hereby measured with units of radians and time. Half-angle formulas for slopes and boosts pertain to spinor algebra. The new light velocity is justified when its derivative results in Einstein's mass–energy formula. Relativity is reformulated with these half-angle formulas.     

Umsetzung von Metall- und Metalloidverbindungen mit mehrfunktionellen Molekülen, 22. Mitt.: Die Reaktion von Trimethylsilylcarbonsäureamiden mit Halogen(diorganyl)boranen

Trimethylsilylacetamide and trimethylsilyltrifluoroacetamide react with halogenodiorganylboranes to monomeric or dimeric amidoboranes depending on the organyl substituents. The compounds were characterized analytically and spectroscopically (NMR:¹H,¹⁹F,¹¹B; MS; IR).

21. Mitt.:A. Meller, W. Maringgele, K. Hennemuth undU. Sicker, J. Z. anorg. allg. Chem., im Druck.     

Vapour-liquid equilibria in nonpolar mixtures : II. Carbon tetrachloride with alkylbenzenes and n-alkanes at 313.15 K

Góral, M. and Zawadzki, S., 1993. Vapour-liquid equilibria in nonpolar mixtures. II. Carbon tetrachloride with alkylbenzenes and n-alkanes at 313.15 K. Fluid Phase Equilibria, 90: 355-364.

Total vapour pressure measurements using a modified static method at 313.15 K are reported for binary mixtures of CCl₄ with benzene, toluene, o-xylene, p-xylene, hexane, heptane, octane, nonane and decane. The results were correlated with the generalized Redlich-Kister equation for excess Gibbs energy. A comparison with literature vapour-liquid equilibrium data and excess enthalpy was made. Consistency within homologous series was checked. Predictions made using the UNIFAC method and the Hildebrand-Scatchard equation were compared.     

碱性介质中葡萄糖在铂电极上的阳极氧化

为了进一步探明葡萄糖在铂电极上的氧化机理,用循环伏安法(CV)在-0.9～0.4 V(相对于饱和甘汞参比电极)内研究了葡萄糖在铂电极上催化氧化行为,首次详细报道了葡萄糖在电化学氧化过程中的电位振荡现象,并用电流扫描法表征了葡萄糖的电位振荡情况.电流扫描结果表明,在较慢的电流扫描速度下,电极过程出现了明显的电位振荡.说明电极上产生了毒化中间物,电位振荡是由于毒化中间物在电极上的吸附和在高电位下氧化除去引起的.     

甘氨酸燃烧法合成纳米ZnO-MgO及其紫外光发射

ZnO-MgO nanocomposite was prepared by glycine nitrate combustion method.Its photoluminescence property, the structure and annealing temperature dependence was studied by XRD, FTIR and SEM. The results show that the photoluminescence property of ZnO-MgO nanocomposite is greatly improved compared with that of pure ZnO. Under 325 nm laser excitation, the emission spectra of the 900 ℃ treated composite sample had an obviously enhanced ultraviolet (UV) band centered at 385 nm at room temperature. The luminescence intensity of the UV band became stronger with the increase of annealing temperatures and reached a maximum at 900 ℃ but decreased at 1000 ℃. The photoluminescence intensity was mainly affected by the grain size, the crystallization and the action between ZnO and MgO nanoparticles. In addition, an appropriate G/N value was favorable for improving the UV-PL properties of the nanocomposite samples.