2,3,5-三溴-4''''-硝基-4,2''''-双羟基二苯醚的合成及其抑菌活性研究

天然多溴代羟基二苯醚类化合物是存在于海洋海绵体中的一类抑菌活性物质,国内外学者对此类物质进行了大量的研究工作,发现他们具有良好的抑菌性,能有效抑制多种有害菌[1-4]的生长.     

工业原料铁制备浆态床FT合成用的Fe-Cu-K-Si催化剂的探索

费托合成技术是公认的将煤基合成气转化为液体燃料和化工原料的重要技术途径。虽然固定床费托合成技术从五十年代起已经工业运转，但是浆态床费托合成技术由于其传热性能好，可直接使用第二代气化炉生产的富CO合成气，反应器结构简单，单台反应器生产能力大，开工率高，产品结构合理，     

Microstructure and Ion Exchange in Stearic Acid Langmuir-Blodgett Films Studied by Fourier Transform Infrared-Attenuated Total Reflection Spectroscopy

Fourier transform infrared-attenuated total reflection (FTIR-ATR) spectra have been recorded of 11-layer Langmuir-Blodgett (LB) films of stearic acid deposited at various surface pressures (0.1, 15, and 35 mN/m), and the molecular orientation angles were evaluated quantitatively, which supplied insight into the molecular order with the alkyl chains tightly packed like crystal in the LB films deposited at the zero and higher surface pressures. These experimental results indicate that, in the Langmuir film as the precursor of LB films, stearic acid molecules self-aggregate to form two-dimensional crystalline domains already even at the zero surface pressure, which results in the inhomogeneity of monolayer. The analysis of dependence of nu(C=O) intensity on the surface pressure, surface density, and subphase temperature leads to the conclusion that the defects in LB films originate from the Langmuir film and be conserved upon deposition. Annealing below 50 degrees C and cooling could improve the monolayer homogeneity, and thus a defect-free or low-defect LB films can be deposited. Furthermore, ion exchange conducted in the LB films, on the other hand, confirms the existence of structure defects in LB films of stearic acid. The polar plane microstructure, lateral transport along the polar planes and the coordination types of stearic acid/cation system may be the rate-limiting process. The results have implication on the possible uses of stearic acid LB films as ion-exchange materials or sensors. Copyright 2001 Academic Press.     

Determination of Gossypol in Trace Level by Flow Injection Analysis with Chemiluminescence Detection

Gossypol, [1, 1′, 6, 6′, 7,7′-hexahydroxyl-5,5′-diisopropyl-3,3′-dimethyl-(2,2′-binaphtha- lene)-8,8′-dicarboxaldehyde] is a polyphenolic yellow compound naturally occurring in various parts of cotton plants1. The compound has been associated with     

α－芳甲酰基烯酮二硫缩醛的新合成方法

以碳酸钾为碱，芳甲酰丙酮（１）与二硫化碳、卤代烃反应得到２－乙酰基－２－芳甲酰基烯酮硫代缩醛（２），２在乙硫醇钾作用下脱乙酰基生成标题化合物（３）。１→３的转化具有反应条件温和、产物产率高及对３中各种缩醛基均可通用等特点。     

刚性链嵌段共聚物研究 Ⅱ．含双酚S的聚醚醚酮共聚物合成与性能

series of multiblock copolymers composed of polyetheretherketone (PEEK) and 4, 4'-dihydroxydiphenylsulfone (DHDPS) were synthesized by polycondensation. The property of copolymers were characterics by DSC, IR, WAXD and TGA. The results indicate that the T_g of copolymers increases with increasing DHDPS content' When the DHDPS content of the copolymers is less than 22% (the average degree of polymerization of PEEK oligomers is more than 6), the copolymers are Crystalline polymers. The highest T_g of the Crystalline copolymers is 160℃,the lowest T_m is 304℃.     

化学蒸气沉积硅氧化合物调变HZSM－5沸石的研究

本文研究了正硅酸乙酯分别在无胺法和有胺法制得的ＨＺＳＭ－５沸石上的沉积过程，并用吸附，ＮＨ３－ＴＰＤ及异丙醇探针反应等手段表征了沉积后的样品，发现沉积仅在外表面上进行，可使孔口变小但不影响孔道内性质，显示有对于二甲苯分子的择形吸附能力，且在甲苯甲醇烷基化反应和二甲苯异构化反应中表现出良好的择形催化性能．     

白血病骨髓移植病人全血微量元素铜的变化及其意义

为了研究白血病骨髓移植病人全血微量元素铜的变化及其意义 ,用原子吸收光谱法检测了正常对照组与白血病骨髓移植患者预处理前及移植后骨髓空虚期全血微量元素铜的含量。结果表明 ,正常对照组全血铜浓度与白血病骨髓移植患者预处理前全血铜浓度差异无显著性 (P >0 0 5 ) ,而与骨髓空虚期全血铜浓度有显著性差异 (P <0 0 5 ) ,说明白血病缓解后血铜接近正常对照组水平 ,而白血病骨髓移植患者预处理后骨髓空虚期全血铜含量高于正常对照组 ,说明预处理影响微量元素铜的代谢 ,本文就其影响机理进行了研究     

A New Method to Synthesize the P,N-Heteromultifunctional Ligands

The nature of the highly polar P-N bond in phosphinimine makes a ligand of this kind become versatile in both coordination and organometallic chemistry.[1,2] Usually this kind of phosphinimine phosphine P,N-heterodifunctional ligands is prepared by the Staudinger reaction of azides with organophophine. Now a more mild and efficient method is provided. The product of Mannich reaction of 2-aminopyridine reacted with Ph2PCl in the presence of Et3N, giving the phosphinimine compound 1 in more than 90% yield.     

氧化钨薄膜微型电化学器件的研究

本文论述了WO_3薄膜氢离子敏器件的结构、原理、制备技术和测试分析。利用WO_3薄膜在H+溶液中由绝缘转化为导电特性,成功地研制成氢离子敏器件。这是一种简易而经济的微型pH敏器件技术。