Novel preparation of organic polymer-based monolithic column by microwave irradation

Microwave irradiation was firstly attempted for the preparation of organic-based monoliths of poly（styrene-divinylbenzene- methacrylic acid）, which single step in situ polymerization was carried out during 15 min. The colunm permeability, electrophoretic and chromatographac behaviors were comparatively evaluated using pressure-assisted CEC, GEC and low pressure-driven separation modes. The largest theoretical plates for the preparing column could be close to 18,0000 plates/m for thiourea in the mode of p-CEC. It provided a viable alternative to traditional initiation means for the perparation of monolithic capillary columns.     

Preparation of polymer-supported phosphine from ferrocene for palladium-catalyzed Suzuki-Miyaura cross-coupling reactions

Polymer-supported phosphine ligand 3b derived from ferrocene was prepared,and applied in palladium-catalyzed Suzuki- Miyaura reactions.A range of aryl bromides can couple with phenylboronic acid to obtain corresponding biaryls in excellent yields. The recycling of the polymer-bound catalyst was tested without adding palladium.     

Evaluation of Eigenvalues by Successive Variations

A successive variation method was studied and tested on the hydrogen molecular ion H₂⁺. Results show that it takes less computational time than conventional method. It was also found that ground state wavefunction of H₂⁺ can be well approximated by the linear combination of the simplest Gaussian orbitals e^?I(T-a)3     

Numerical examination of performance of some exchange-correlation functionals for molecules containing heavy elements

The performance of 17 exchange-correlation functionals for molecules containing heavy elements are numerically examined through four-component relativistic density DFT calculations. The examined functionals show the similar accuracy as they do for the molecules containing light elements only except for bond lengths. LDA and OP86 produce good results for bond lengths and frequencies but bad bond energies. Different functionals do not show much different performance for bond energies except LDA. BP86 and GP86 produce results with average accuracy while LYP does not perform well. Although encouraging results are obtained with functional B97GGA-1, other heavily parameterized and meta-GGA functionals do not produce impressive results.     

柱偶联装置在毛细管等速电泳中的应用

根据自制的ＯＣＥＰ－１型离子分析仪的特点，设计了一套新的住偶联装置。提高了分离容量，可以用来检测复杂混合物中的低浓度组分。用等速电泳法测定了高浓度Ｃｌ＾－，Ａｃ＾－存在时的Ｆ＾－。这个装置对于处理离子性组分，无论在研究工作还是实际分析工作中，都是很有用的。     

Spectrophotometric determination of aluminium with chlorophosphonazo I

Aluminium reacts with Chlorophosphonazo I at pH 4-6 to form a water-soluble 1:1 red-violet complex. The absorption maximum is at 610 nm and the apparent molar absorptivity is 1.96 x 10(4) l.mole(-1).cm(-1). The apparent instability constant has been calculated to be 1.8 x 10(-4). The colour of the complex is stable for 24 hr. Beer's law is obeyed over the concentration range up to 0.8 mug ml . Titanium and zirconium interfere seriously.     

现场傅里叶变换-红外光谱及紫外-可见光谱电化学研究高氯酸四苯基卟啉合锰(Ⅲ)氧化还原机理

本文以现场透射傅里叶变换-红外光谱及紫外-可见光谱电化学方法,研究了高氯酸四苯基卟啉合锰(Ⅲ)在二氯乙烷溶液中电极氧化还原的机理,发现了红外及紫外—可见光谱电化学的证据,表明该锰(Ⅲ)卟啉的第一步还原反应的电子转移发生在金属中心上,生成锰(Ⅲ)卟啉,而第一步氧化反应是发生卟啉环上,生成锰(Ⅲ)卟啉环阳离子自由基。     

中药血清药理学研究金银花的抑菌活性

采用最低抑菌浓度(MIC)测定方法和抑菌活性试验,考察不同产地的金银花以及含药血清的抑菌效果。试验结果为:含药血清对大肠杆菌和金黄色葡萄球菌的MIC分别为0.5μg绿原酸/mL和0.25μg绿原酸/mL;含药血清抑菌活性为高敏。