十六烷基二苯醚二磺酸钠表面化学性质及胶团化作用

用滴体积法通过表面张力的测定, 系统地研究了十六烷基二苯醚二磺酸钠(C₁₆-MADS)在不同温度(298.0～318.0 K)和不同NaCl浓度(0～0.50 mol•L^-1)下的表面活性. 结果表明, 温度升高使C₁₆-MADS溶液的临界胶束浓度(cmc)略有增大, 表面极限吸附量(Γ_∞)降低. cmc随NaCl浓度的增大从1.45×10^-4 mol•L^-1降至4.10×10^-5 mol•L^-1, 但最低表面张力(γ_cmc)基本不受影响. 在298.0 K与303.0 K时, NaCl浓度的增大, Γ_∞增大; 在308.0、313.0与318.0 K时, NaCl浓度的增大, 出现了Γ_∞从2.27 μmol•m^-2降低至1.41 μmol•m^-2的“反常”现象. 胶团形成自由能(ΔG_m⁰)随温度和NaCl浓度增加负值增大(－63.98～－76.20 kJ•mol^-1), 胶团的形成主要是熵驱动过程.     

微波促进Ni(Ⅱ)催化下烷基锌与芳香醛的烯基化反应

在Me3SiC1和Ni(PPh3)2Cl2存在下,通过微波辐射带官能团的烷基锌与芳香醛反应得到了反式烯烃.产率比传统方法有所提高,反应时间缩短了90～120倍.     

Enantioselective Conjugate Addition of Diethylzinc to Chalcone Catalyzed by Ni（acac）2 and Chiralβ-Amino Alcohols

Enantioselectivge conjugate addition of diethyzinc to chalcone was carried out in the presenee of Ni (acac)2 complexed with five pyrrolidfumyimethanois derived from L-proline. (S)-N-Benzyl-2-(l-hydroxy.l-methylethyl) pyrrolidlne was found to be the best ngnd in asymmetric conjugate addition among the five ligands. The products were obtained with up to 70% ee.The configuration of the product was determined jointly by the substituents on the carbon of the hydroxy group and the nitrogen atom.     

THE EXTRACTION OF GOLD FROM CYANIDE SOLUTION BY α—ALKYL SUBSTITUTED PYRIDINE RESIN

In this paper,we have studied the adsorption properties of gold by α-alkyl substituted pyridine resin( BPR) in alkaline solution.The single and dual component kinetic mass transfer process of Au(I),Ag(I) and other metal cyanide ions were also investigated.The results obtained show that the mass transfer rates of the cyanide ions in the resin phase are closely related to the molar ratio and the configuration of metal cyanide ions. The elution kinetics of Au(I) and other cyanide ions by NH4SCN has been investigated systematically.The intraparticle diffusion coefficient and activation energy of Au(I),Ag(I),Ni(I) Fe(Ⅲ） cyanide anions were determined in CI,NO3,OH-type BPR resin at different temperatures.It is found from the experimental results that the mechanism for extracting Au(I),Ag(I) and other metal cyanide anions by BPR resin belongs to ion exchange process.The difference of activation entropy of some metal cyanide anions(ΔS-ΔS^-) was evaluated.     

三甲基硅氧基钠参与下的氟烷基碘与烯烃反应

近年来,氟烷基碘(1)对烯烃的加成反应得到了广泛的研究。我们已经报道了铜、锌、镁、铁、镍、钯、铂、铱等金属催化下的反应,以及cd型阴离子引发下的加成反     

时域反射谱法研究烷基丙烯酸酯与酚复合的介电弛豫

The dielectric relaxation measurements on binary mixtures of esters (methyl acrylate, ethyl acrylate, and butyl acrylate) with phenol derivatives (p-cresol, p-chlorophenol, and 2,4-dichlorophenol) were carried out at different concentrations at 303 K using the time domain reflectometry (TDR) over the frequency range from 10 MHz to 20 GHz. The Kirkwood correlation factor and excess inverse relaxation time were determined and discussed to yield information on the molecular interactions of the systems. The relaxation time increased with increasing concentration of phenols and increasing chain length of esters. The excess inverse relaxation time values were negative for all the systems, which indicated the solute-solvent interaction existing between esters and phenols producing a field in such a way that the effective dipole rotation was hindered.     

烷基钴叶啉[(TPP)CoR]的电化学合成和现场伏安/现场光谱电化学研究

本文报道甲基、乙基、丙基和丁基钴卟啉化合物的电化学合成和现场伏安、现场光谱电化学研究.烷基化反应的速度被确定.这些烷基钴卟啉还原反应生成烷基饱和的四苯基chlorin钴化合物.     

长碳链季铵类卟啉钴配合物的合成及其LB膜和气敏性质

四－（4－N，N，N－二甲基）卟啉（TDMAPP）与溴代正十六烷反应得到溴化四－（4－N，N，N－二甲基，十六烷基氨基苯）卟啉（TDMHAPPBr)并制得其钴的配合物，两者均具有良好的成膜性。电子吸收光谱表明LB膜与成膜前固体物分子排列规整性不同，钴配合物对敢有较好的敏感性和良好的选择性，其响应和恢复时间都较短。     

二阶导数光谱峰面积法测定中草药中微量锗

在Ge 苯基荧光酮 (PF) 氯化十六烷基吡啶 (CPC)三元络合物的显色体系中 ,引入二阶导数光谱峰面积技术 ,对锗的显色体系及测定方法进行了研究。该方法有效地消除了W 、Sn 、Mo 、V 、Ti 和Fe(Ⅲ )等离子的干扰 ,提高了准确度和选择性。线性范围为 0～ 1 5mg L,检出限为 3 .3 μg L ,εGe为 1 .4× 1 0 5L·mol- 1 ·cm- 1 。用于中药材中Ge 的测定 ,标准加入试验的回收率为 1 0 1 .0 %～ 1 1 2 .0 %。     

Comparative Studies on Mass Spectrometric Fragmentation of Linear Chiral Secondary Alcohols （ R ） -1-（4-Alkylphenyl） and （ R ） -1- （ 4-Alkoxyphenyl/Alkylthiophenyl ） Alcohols

Introduction Chiralsecondaryalcoholsareveryimportantinter mediatesinorganicsynthesis.Theyaregenerallypre paredviachemicalorenzymaticresolutionofracemic secondaryalcohols[1—4],chemicalorenzymaticasym metricreductionofprochiralketones[5—7],andasym metrica…