Zn-Al-Ce三元类水滑石的制备及性质研究

采用共沉淀法，水热合成层状化合物一硝酸根柱撑锌铝铈三元类水滑石，分别测定了各种单一金属盐溶液及M^2 ／M^3 摩尔比为2，Ce^3 ／Al^3 摩尔比为0．25的混合金属盐的NaOH滴定曲线，并利用XRD对不同条件下合成产物进行物相分析。实验结果表明：在M^2 ／M^2 =2，Ce^3 ／Al^3 =0．07～0．50，pH=5．8～6．5条件下进行多种离子共沉淀，并经120℃、6h水热处理后，均能合成结构单一的ZnAlCe—HTLLcs，利用TG—DTlA、FT—IR、ICP对合成物进行了表征，筛选出适宜的合成条件，并对HTLcs层状结构的热行为进行初步研究，结果表明ZnAlCe—HTLcs热稳定性较差，层间结合水、层板羟基及层间客体物种(NO3^-)失去温度在240℃左右，易于转化为复合氧化物，将此复合氧化物应用于NO的催化?肖除反应，680℃下NO的转化率高达近100％。     

Selection of Anodic Material Used in Electrolytic Process for Producing Hypophosphorous Acid

Black lead, Ti-Ru and Ti-PbO2 were used as anode and stainless steel was used as cathode The electrolytic process of producing hypophosphorous acid with four-compartment electrodialytic cell was studied. The comparison of some factors, such as anodic voltage, product concentration and current efficiency, of black lead, Ti-Ru, and Ti-PbO2 electrodes was conducted. As a result, theTi-PbO2 electrode is the optimal anode material used, it can be in electrolytic process for producing hypophosphorous acid.     

Fluoride and lead adsorption on carbon nanotubes

The properties and applications of CNT have been studied extensively since Iijima discovered them in 1991[1,2]. They have exceptional mechanical properties and unique electrical property, highly chemical stability and large specific surface area. Thus far, they have widely potential applications in many fields. They can be used as reinforcing materials in composites[3], field emissions[4], hydrogen storage[5], nanoelectronic components[6], catalyst supports[7], adsorption material and so on.…     

纳米尺寸团簇NinZrn(n=3～5)的几何结构与成键规律研究

根据化学键理论与拓扑原理，设计了团簇NinZrn(n=3-5)的可能几何构型，并用从头算方法进行构型优化，结果表明，由NiZr组成的团簇原子间的Zr-Zr和Zr-Ni键明显较强，而Ni-Ni的成键较弱，并发与NinZrn(n=3-5)团簇电子性质与有机烯烃分子等瓣相似，原子之间的成键按照强弱相间的规则分布。     

大鼠肝脏金属硫蛋白的分离纯化和金属硫蛋白亚型-Ⅱα结构域片段的制备及其核磁共振鉴定

Wistar雄性大鼠经腹腔注射CdCl_2诱导其肝脏合成金属硫蛋白。取鼠肝,先经匀浆、热变性、乙醇-氯仿萃取、丙酮沉淀等步骤,后由Sephadex G-75、DEAE-52柱层析,得金属硫蛋白的两亚型Ⅰ和Ⅱ。经原子吸收光谱测定每蛋白分子含有5个镉和2个锌。用枯草杆菌酶割法制备并分离了金属硫蛋白亚型Ⅱ的α结构域片段。还用NMR研究了金属硫蛋白的两个亚型及所得的α结构域片段。     

有机锡试剂在有机合成中的某些新应用

本文阐述有机锡试剂在有机台成巾的一些新应用。在钯催化下,有机锡试剂与亲电试剂进行偶联,条件温和,收率高。有机锡试剂促进醇醛缩合,可用于不对称合成中。     

On-line Separation and Detection of Peptides by Capillary Electrophoresis / Electrospray FT-ICR-MS

Recently, capillary electrophoresis/electrospray ionization mass spectrometry (CE/ESI- MS) has been rapidly developed as a powerful analytical tool for charged species ranged from small molecules such as carboxylic acids1, phenolic compounds2, metal species3, tetramines4, herbicides5, drugs and drug metabolites6 to peptides and proteins7, 8. The ESI mode has proven to be sensitive, versatile and relatively easy to use in combination with CE. CE confers rapid analysis and efficient separ…     

Friedlnder反应研究进展

以邻氨基苯甲醛与各种酮发生的Friedl nder反应为主 ,全面介绍了国内外Friedl nder反应的研究近况。由于Friedl nder反应的反应条件温和、反应底物变化多样、反应产率高 ,而且合成产物的应用范围涉及天然产物化学、药物化学、金属有机化学等诸多领域 ,因此对Friedl nder反应的深入研究具有广阔的前景。参考文献2 8篇。     

新颖双核钐硫酚化合物[(THF)3I2Sm(m-SAr)]2 (Ar = Ph, 4-Me2NC6H4)的合成与化合物[(THF)3I2Sm(m-S-4-Me2NC6H4)]2的晶体结构

Reactions of SmI2 in THF with ArSSAr produced two binuclear samarium thiolate complexes [（THF）3I2- Sm（μ-SAr）]2 [Ar=Ph （1）, 4-Me2NC6H4 （2）] in high yields. The structure of 2 was characterized by single crystal X-ray crystallography. The crystal of 2 belongs to the triclinic system with space group P 1 and a=0.95705（13） nm, b= 1.22287（14） nm, c= 1.26450（14） nm, a=64.194（11）°, B=78.491（13）°, y=76.176（12）°, V= 1.2860（3） nm^3, Z= 1,μ=4.783 mm^-1, Dc= 1.964 Mg/m^3, M= 1521.19, S= 1.046, R1=0.0358, wR2=0.0910. X-ray analysis revealed that 2 is a thiolate-bridged dimer in which each Sm atom adopts a distorted pentagonal bipyramidal coordi- nation geometry.     

荧光探针法研究可聚合有机分子(BMDM)/二苯醚的凝胶化过程

用荧光素作荧光探针 ,研究了可聚合凝胶因子 4,4′ 二 (α 甲基丙烯酰氧基 1 ,3 亚乙氧基羰基丙酰氨基 )二苯甲烷 (BMDM)在二苯醚的凝胶化过程中的聚集状态 .研究结果发现 ,与荧光素在二苯醚溶液中的荧光光谱相比 ,在凝胶中出现了 1 0～2 5nm的红移 ;而且发现分子凝胶的凝胶化时间随着BMDM浓度的增加而减小 .偏振荧光法研究分子凝胶的取向发现 ,该分子凝胶的形成过程是从各向同性的溶液(P0 =0 )向各向异性的溶胶 (P>0 )转变 ,再向各向同性的凝胶 (Pgel≈ 0 )转变的过程