钴镍取代杂多酸盐甘氨酸超分子化合物的合成及性质

Supermolecular compounds of glycine monosubstituted heteropolytungstates isomer with Keggin structure β_i-K_6-n(HGly)_n[SiW₁₁M(H₂O)O₃₉]·xH₂O (M=Co²⁺, Ni²⁺； β_i=β₂, β₃) were synthesized and characterized by means of elementary analysis, IR, UV, TG-DTA, X-ray diffraction, polarography and CV. The results indicate that glycin combines the electrostatic effect with heteropolytungstates isomer. The heteropoly anion still remains its Keggin structure in supermolecular compounds. The electrochemical behavior of the compound in 1 mol·L^-1 HAc-NaAc shows that two redox waves correspond to two two-electron processes attributing to the reduction of [SiW₁₁Co(H₂O)O₃₉]^6-. Steady-state fluorescence spectrum shows two intenser fluorescence emission peaks in 447 nm and 486 nm appeared after the supermolecular compound being excited by the excitation wavelength in 274 nm.     

α—h—ANF及其类似物的固相合成及活性研究

由计算机辅助设计.以Fmoc-AA-Pfp为单体,用固相法合成了a-h-ANF及其两种类似物,产率较高.兔心血管收缩试验表明,两种类似物的血管舒张活性均高于a-h-ANF.     

Preparation of Polyclonal Antibodies Against Testis-specific Protease 50 and Characterization of Antibody Specificity

Introduction TheTSP50genehasbeenidentifiedasoneofthe testis specificoncogenes,whichisexpressedathigh levelsinapproximately92%ofhumanbreastcancer samples,makingitanattractivemolecularmarkerand apotentialtargetfordiagnosisandtherapy[1].Itisho mologoustomany…     

电化聚合聚吡咯的角分布X射线光电子能谱研究

用角分布Ｘ射线光电子能谱（ＸＰＳ）测试和样品原位加热相结合的方法研究了阴离子是对甲苯磺酸根的电生导电聚吡咯的化学和聚集态结构．其结果表明聚吡咯表面约几个原子层内原子的相对浓度依下述次序递减：Ｃ＞Ｏ＞Ｓ＞Ｎ；导电聚吡咯中的氮原子至少有吡咯氮和氧化态氮两种；在２００℃加热以后聚合物链不受影响，但阴离子向表面迁移，同时氧化态氮大大减少．     

二氧化碳与丙烯直接合成甲基丙烯酸用CuPMo／TiO2催化剂的研究

 用溶胶－凝胶法以磷钼酸（MPA）的铜盐溶液水解钛酸四丁酯制备了CuPMo／TiO2催化剂，并用ICP，XRD，TG－DTA，IR，TPD－MS和微反技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化性能．结果表明：杂多钼酸盐与TiO2表面通过O2－桥发生键联．在623K下，杂多阴离子仍保持其原有的Keggin结构；CO2在Lewis酸位Cu（Ⅱ）和Lewis碱位Cu－O－Mo桥氧的协同作用下形成卧式吸附态Cu（Ⅱ）←O－（CO）←（O－－Cu）；丙烯以分子吸附态在催化剂上吸附；在空速1500h－1，压力1MPa和温度563K的反应条件下，丙烯的转化率为4．2％，甲基丙烯酸的选择性为96％．     

八配位钇(Ⅲ)-反式-1,2-环己二胺四乙酸配合物NH4[Y(trans-CYDTA)(H2O)2]·4.5H2O的合成及分子结构

In this paper, the molecular and crystal structures of the NH₄[Y(trans CYDTA)(H₂O)₂]·4.5 H₂O(trans-CYDTA=trans 1,2-cyclohexanediaminetetraacetic acid) are reported. The crystal data are as follows: Triclinic system, P1space group,a=0.8599(6)nm,b=1.0021(7)nm,c=1.4370(9)nm,α =88.095(13)°,β =75.559(1)°,γ =88.344(12)°,V=1.1981(14)nm³,Z=2, M=708.68,D_c=1.570g· cm^-3, μ =2.506mm^-1 and F(000)=590. The final R₁ and wR₂ are 0.0571 and 0.1350 for 4205 [I >2.0σ (I)] unique reflections and 0.1007 and 0.1615 for all 4981 reflections, respectively. In the title complex, the anion [Y(trans-CYDTA)(H₂O)₂]^- has an eight coordination structure with distorted square antiprism. The trans CYDTA which acts as a hexadentate ligand with four Oatoms and two Natoms and two H₂O molecules directly coordinate to central metal Y(Ⅲ) ion. It can be known that the Y(Ⅲ) ion can form an eight coordinate compound with aminopolycarboxylic acid ligands in addition nine coordination structure.     

聚苯基膦酸二苯砜酯对PET凝聚相阻燃作用的研究

采用热重分析、Ｘ－射线光电子能谱和红外光谱分析等手段，研究了含聚苯基膦酸二苯砜酯（ＰＳＰＰＰ）的聚对苯二甲酸乙二酯（ＰＥＴ）阻燃体系的热化学，探讨了ＰＳＰＰＰ对ＰＥＴ的阻燃机理．ＰＳＰＰＰ的加入，明显改变了ＰＥＴ的热分解行为：ＰＳＰＰＰ拓宽了ＰＥＴ的分解温度范围，降低了ＰＥＴ在可燃温度范围内的分解产物的量；在ＰＥＴ的点燃温度以下，ＰＳＰＰＰ对ＰＥＴ的降解起到一定的促进作用，而在点燃温度以上，产生的降解产物有利于促进炭化．４００℃以上，ＰＥＴ和ＰＳＰＰＰ的结构发生了明显的变化，所产生的结构有利于ＰＥＴ的降解，使ＰＥＴ的分子量急剧减小，粘度下降，易于形成熔滴，有利于促使着火部分离开火源，增加燃烧的ＰＥＴ表面的物质损耗和热损耗，起到阻燃作用．     

三缺位杂多化合物K_8［P_2W_（18）Mo_2Co_2（H_2O）_2O_（68）］·MoO_6·15H_2O的合成、结构及催化H_2O_2分解研究

合成了杂多化合物Ｋ８［Ｐ２Ｗ（１８）Ｍｏ２Ｃｏ２（Ｈ_２Ｏ）２Ｏ（６８）］·ＭｏＯ６·１５Ｈ２Ｏ，依据ＸＲＤ、ＩＲ、ＵＶ－Ｖｉｓ及ＸＰＳ确定了其晶体结构和配位原子价态，考察了该化合物催化Ｈ２Ｏ２分解的动力学行为。     

Enantioseparation of Novel Chiral Tetrahedral Clusters on a Chiral Stationary Phase (CSP) by High Performance Liquid Chromatography

In recent years, the synthesis of chiral tetrahedral clusters has been studied extensively and various types are accessible , which are a kind of organometallic compounds with greatly growing interest due to their potential application to asymmetric reaction catalysts. As an efficient     

高介电常数TiO2纳米晶的表面态研究

将钛酸四丁酯和硬脂酸在熔融状态下混合均匀后置于冷水浴中,使其凝固成凝胶,通过控制烧结过程中氧气的含量,成功地制备出粒度均匀、介电性能好的纳米晶TiO2.通过采用X射线光电子能谱和表面光电压谱对纳米晶TiO2表面状态的分析发现,材料表面存在大量的氧空位缺陷,暴露在粒子表面上的主要是一些金属Ti4+.纳米材料的这种表面状态对其极化性质具有重要的影响,使其在接近静态条件下的低频介电常数远大于常规材料的介电常数.