羟基铝溶液及铝交联蒙脱土的研究

本文用(27)~Al NMR法和8-羟基喹啉萃取法分别研究了羟基铝溶液中十三聚铝含量的变化规律,还用X-射线衍射法研究了铝交联蒙脱土d_(001)的变化。研究结果表明,铝离子的聚合情况主要由羟铝比决定,而浓度影响不大。随着羟铝比的增加,溶液中单核铝离子含量减少,十三聚铝离子相对含量增加,所得铝交联蒙脱土的d_(001)也随之增大。参照这些变化规律、控制羟基铝溶液的组成,可以制备各种层柱状铝交联蒙脱土复合物。     

超球坐标下原子、分子体系的变分计算：—氦原子和氢负离子基态

应用超球会标表示氦原子和氢负离子的薛定谔方程，将二电子原子在三维空间中的运动转化为单电子原子在六维空间中受广义库仑力作用的运动，我们给出了六维空间广义角动量算符的本征值与本征函数，并以此本征函数微基构造超球波函数，得到超球径微分方程，以广义Laguerre 多项式表示超球径波函数，运用密度矩阵和线性变分法得到非正交基下超球径波函数满足的久期方程，最后求得能量和波函数，计算结果与精确的计算符合良好。     

混合配体配合物钯(Ⅱ)-联喹啉-苯乙基丙二酸根与DNA作用研究

The mixed ligand complex [Pd(biqu)(pmal)]·H₂O (where biqu is 2,2′-biquinoline, pmal is phenethylmalonate) has been synthesized and its interaction with sperm DNA was determined by fluorescent spectra、 UV-Vis spectra and CD-spectra. The binding constant (K_b) of the complex and sperm DNA is 1.26×10⁴ and its interaction with pBR322 plasmid DNA was also determined by gel electrophoresis. The results show that the complex interact with DNA mainly by intercalative mode.     

四甲基二硅氧基桥联双环戊二烯基稀土金属配合物的合成及 …

在严格的无水无氧条件下无水ＮｄＣｌ３和ＳｍＣｌ３与Ｎａ２（Ｃ５Ｈ４ＳｉＭｅ２）２Ｏ以１：１摩尔比在四氢呋叶溶液中反应，得标题配合物（Ｏ（Ｍｅ２ＳｉＣ５Ｈ４）２Ｌｎ（μ－Ｃｌ）（ＴＨＦ）２（Ｌｎ＝Ｎｄ（１），Ｓｍ（２），元素分析证明配合物１和２的组成，Ｘ射线衍射分析证明１和２是通过氯原子桥联的二聚体结构。     

桥联双β-环糊精对N-[4-(1-芘基)]丁酰-D/L-苯丙氨酸的手性识别及机理研究

利用紫外-可见吸收和荧光发射光谱, 结合非线性最小二乘法拟合曲线以及分子力学(MM2)模拟系统地研究了手性分子N-[4-(1-芘基)]丁酰-D/L-苯丙氨酸(PDP和PLP, 总称PPs)与β-环糊精(β-CD)、 2-位硒桥联双β-CD(2-SeCD)和2-位碲桥联双β-CD(2-TeCD)的包结能力大小及这3个环糊精对PPs手性识别能力的差异和识别机理. 研究结果表明, PPs不能与单疏水空腔的β-CD形成很好的包结复合物, 与具有较长桥联链的2-TeCD结合能力最强. 2-TeCD与PDP和PLP的结合常数分别为2.33×104和6.07×103 L/mol, 对PPs的手性识别比达到KD/KL=3.84, 高于2-SeCD(KD/KL=2.61). 用MM2模拟得出了PPs与这两个双环糊精形成复合物的三维结构: PPs的绝大部分位于双环糊精两个空腔之间, 但是在这两个复合物中, 苯环与芘环所成的二面角不同. 此外, PPs与这两个双环糊精作用时均存在明显的氢键相互作用, 且2-TeCD强于2-SeCD.     

丙烯酸甲酯/4-丙烯酰胺基-2,2,6,6-四甲基哌啶光共聚合体系的竞聚率和序列分布研究

以丙烯酸甲酯(MA,M1)和4-丙烯酰胺基-2,2,6,6-四甲基哌啶(AATP,M2)溶液光共聚合体系为研究对象,采用1H-NMR手段测定了MA/AATP共聚物的组成,用Mayo-Lewis积分法和扩展Kelen-Tüdos方法计算的竞聚率分别为0.88相似文献   

催化光度法测定痕量钼—钼（Ⅵ）—盐酸联氨—橙黄Ⅳ催化光度新体系

基于盐酸介质中，钼（Ⅵ）催化盐酸联氨还原橙黄Ⅳ的反应，建立了动力学分光光度法测定痕量钼的新方法。本法检出限为３．７×１０＾－３μｇ／ｍＬ，测定钼量范围为０．０２５～１．８μｇ／ｍＬ。已将此法用于测定绿豆中的钼及钼酸铅和钼酸钡的溶度积。     

带电胶体离子扩散与交换动力学的比较

Taking soil colloid and hydrated silica (quartz sand) as the experimental material, the comparative study has been made on the kinetics of ion diffusion and ion exchange in charged colloid and charged coarse disperse systems. The results showed that ion exchange kinetics in the two systems conform to the kinetic law of ion diffusion. Besides, through this comparative study on the kinetics of ion exchange and ion diffusion, a method has been advanced theoretically to estimate the quantity of adsorbed ion that is located in the inner of the Helmholtz layer. As far as hydrated silica is concerned , there were about 33 per cent of the total adsorbed quantity of Mg2+that were located in the inner of the Helmholtz layer under the given experimental conditions, bu tfor soil colloid the percentage was only 7.5.     

酶联免疫吸附分析法测定水样中的阿特拉津

应用阿特拉津半抗原衍生物共价交联于载体蛋白分子上，制成免疫抗原，经免疫得到高质量的兔抗阿特拉津抗血清。经条件优选，建立了测定阿特拉津的酶联吸附分析竞争法，测定性范围为０．０５－５．００μｇ／Ｌ，最低检出限仅为０．０１８－０．０２２μｇ／Ｌ，且精密度高，特异性强。     

硝酸铽与1，1，1′，1′-四(吡啶-2-羧酸酯基)联三甲基丙烷配合物的合成、表征及荧光性质

Solid complex of terbium nitrate with a novel tetrapodal ligand, 1,1,1′,1′-tetra(2-pyridinecarboxylester)-di(trimethylpropane) was prepared. This new complex with the formula of [TbL(NO₃)](NO₃)₂·2H₂O was charact-erized by elemental analysis, molar conductivity, IR spectroscopy and thermal analysis. At the same time, the luminescent property of the complex was also studied.