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.     

四苯基卟啉铂电致发光性能的研究

四苯基卟啉铂(PtTPP)可以作为红光掺杂材料制备有机电致发光器件，采用的器件结构为[ITO／CuPc／NPB／BePP2：PtTPP／LiF／Al]，其中BePP2：PtTPP的共沉积膜作为发射层．实验结果表明在发射层中存在着从BePP2到PtTPP的能量传递．通过改变掺杂层中PtTPP的浓度来考察器件的性能，当PtTPP的掺杂浓度在8％(物质的量比)时，器件呈现纯正的红光发射，发射峰位于668nm，器件的效率为0．004lm／W．     

ortho Substituent effect on a 1,5-H shift reaction during thermal decomposition of aryltriazenes

An ortho substituent group has a significant effect on thermal decomposition of aryltriazenes. When the ortho methoxy-substituted phenyltriazenes were treated with methyl iodide at 110-130 °C, 1,5-H shift products were obtained in fair to moderate yields.     

Transition metal 1,2-bidentate thiolates as building blocks and their construction into cluster complexes

Simple fragments of transition metal 1,2-bidentate thiolates, the so-called building blocks of the general compositions ML₃, ML₂, ML, M(O)L₂, ML₂L, MLL, etc. have been proposed to constitute the di-, tri- and tetranuclear complexes concerned in this review. Structureal regularities and characteristics have been discussed and summarized according to the thiolato ligands edt and pdt, bdt and tdt, mp, and mpo, and mpp, respectively.Abbreviations H₂mpo o-mercaptophenol - Hmpo 2-mercaptopyridine-N-oxide - R₂dtc N,N-dialkyldithiocarbamate - Haet 2-aminoethanethiol - H₂bdt o-benzenedithiol - H₂pdt 1,2-propanedithiol - H₂tdt toluene-3,4-dithiol - Hmpp-mppH bis-(3-hydroxy-2-pyridyl)disulfide - Hmp-mpH bis-(2-oxyphenyl)disulfide - H₂edt 1,2-ethanedithiol - dppe 1,2-bis(diphenylphosphino)ethane - H₂tedt 3,4,5,6-tetrachlorobenzene-1,2-dithiol - H₂tpdt 3-thiapentane-1,5-dithiol - H₂mnt maleonitriledithiol - Him imidazole - Bz benzyl - py pyridine     

聚氨酯分子印章的制备和表征

“软平板印刷”微结构制备技术为微米和亚微米器件的制备提供了一条新的途径 [1] ,已被电子学家和材料学家所应用 ,近年来进入了生物学领域[2 ] .本实验室将这一方法与生物分子电子学相结合 ,提出了用于 DNA芯片在片合成的分子印章法 [3,4 ] .分子印章法的实质是接触压印与组合化学相结合的固相界面反应 .聚二甲氧基硅氧烷 ( PDMS)是一种软印刷的优良材料 [5] ,但是由于其疏水性和较差的机械性能 ,必须对其进行改性才能用来制备 DNA分子印章 [6 ] .　　聚氨酯作为一种功能材料 ,由于分子中交替的软、硬链段及其不同的热动力学性能而形成…     

Unlabeled Fluoroimmunoassay with a Europium Chelate

Unlabeled fluoroimmunoassay with a europium chelate is described. The recommended method is simple because the complicated labeling process is omitted. The recovery of some samples ranges from 91 to 111%. The relative standard deviation of the method is less than 10%. The detection limit is about 10⁻¹⁰mol liter⁻¹antigen.     

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。     

缬沙坦类似物合成中间产物的捕获(I)(英文)

Valsartan[1], which is a very useful medicine in thetreatment of high-pressure blood, contains a tetrazolegroup. Its analogues exploration and complex actiontoward metal ions still remain very rare. As acontinuation of our in-situ [2 3] cycloaddition betw…     

从P-Mo(Ⅴ)杂多化合物合成多形貌Al_(13)基钼酸盐晶体

以H3PMo12O4·0nH2O、H4PMo11VO4·0nH2O和(NH4)6P2Mo18O6·2nH2O3种杂多化合物为钼源,采用直接混合后陈化的方法合成了多形貌A113基钼酸盐晶体,相应A113基钼酸盐晶体的形貌和尺寸分别是斜方三棱柱形(80μm×30μm)、星形(30μm×10μm)和叶片形(500μm×150μm)。粉末X射线衍射结果表明这3种多形貌A113基钼酸盐晶体结晶较好,在2θ为6.65°、8.00°和14.16°处都有强而尖锐的衍射峰。而以Na2MoO4·2H2O为钼源时只能制得无定形簇合物。根据ICP、FTIR和TG/DTG结果给出多形貌的Al13基钼酸盐晶体的化学简式为Na[AlO4Al12(OH)24(H2O)12][MoO4]·48H2O。初步探讨了A113基钼酸盐晶体的形成机理。     

游离和溶胶-凝胶固定化甲醛脱氢酶酶促反应动力学的研究

采用溶胶-凝胶法对甲醛脱氢酶进行固定化，酶的包埋率超过了98％．在pH7附近、37℃下，以游离酶和固定化酶作催化剂，NADH为电子供体，进行了甲酸转化为甲醛的酶促反应．游离和固定化甲醛脱氢酶酶促反应都遵循Michaelis-Menten反应机理，用Dalziel提出的双底物酶促反应动力学方程进行拟合．固定化酶酶促反应速率为游离酶酶促反应速率的50％左右．固定化酶的动力学常数φ和米氏常数K高于游离酶，估计是凝胶基质孔中存在扩散效应所致．