Browsing 化学化工－已发表论文 by Title
Now showing items 5951-5970 of 14235
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P-(St-BA-UA-Na~+)高分子电解质胶乳微球的理化性能研究
(四川大学, 2000-01)[中文文摘] 对由无皂乳液聚合法合成的苯乙烯 丙烯酸丁酯 十一烯酸钠高分子电解质 [P (St BA UA Na+) ]胶乳微球在离子介质中的物理化学行为进行了讨论。利用透射电子显微镜 (TEM)对不同介质条件下胶乳微球的形态、粒径及其分布进行了表征 ,认为 Na UA参与了 St、BA的共聚合键连于高分子链上可极大地提高乳化效率和乳液的稳定性 ,其用量对乳胶粒径影响较大 ,介质 p H对胶乳粒径分布有较大影响。[英文文摘]The ... -
P-31 NMR and ESI-MS studies on some intermediates of the peptide coupling reagents triphenyl-chlorophosphoranes
(CHINESE CHEMICAL SOCIETY, 2005)The intermediates of the Appel coupling reagents were studied in acetonitrile, dimethoxyethane and dioxane by P-31 NMR, C-13 NMR spectrum and ESI-MS. In dioxane a new high coordinated phosphorous compound with P-31 NMR ... -
P-31 NMR studies on the ligand dissociation of trinuclear molybdenum cluster compounds
(SCIENCE CHINA PRESS, 2003)A series of carboxylate-substituted trinuclear molybdenum cluster compounds formulated as Mo3S4(DTP)(3)(RCO2) (L), where R = H, CH3, C2H5, CH2Cl, CCl3, (RC6H4)-C-1 (R-1 is the group on the benzene ring of aromatic carboxylate), ... -
p-dimethylaminobenzaldehyde thiosemicarbazone: A simple novel selective and sensitive fluorescent sensor for mercury(II)
(ELSEVIER SCIENCE BV, 2005-10)A novel and simple fluorophore, p-dimethylan-tinobenzaidehyde thiosemicarbazone (DMABTS), was prepared in order to find available fluorescent chemosensor for mercuric ion in aquesous solution. DMABTS emitted fluorescence ... -
p-dimethylaminobenzamide as an ICT dual fluorescent neutral receptor for anions under proton coupled electron transfer sensing mechanism
(2002-04-08)The intramolecular charge transfer (ICT) dual fluorescence of p-dimethylaminobenzamide (DMABA) in acetonitrile,A as found to show highly sensitive response to HSO4- over several other anions such as H2PO4-. AcO- and ClO4-. ... -
P-modified cobalt oxide: A novel and effective catalyst for oxidative dehydrogenation of propane
(ELSEVIER SCIENCE INC, 2013)A series of nanosized cobalt oxide catalysts modified with phosphorus have been synthesized by the sol-gel method and investigated in the oxidative dehydrogenation of propane to propene. With the addition of phosphorus, ... -
p-n Heterojunction photoelectrodes composed of Cu2O-loaded TiO2 nanotube arrays with enhanced photoelectrochemical and photoelectrocatalytic activities
(ROYAL SOC CHEMISTRY, 2013)Cu2O/TiO2 p-n heterojunction photoelectrodes were prepared by depositing different amounts of p-type Cu2O nanoparticles on n-type TiO2 nanotube arrays (i.e., forming Cu2O/TiO2 composite nanotubes) via an ultrasonication-assisted ... -
p-π共轭分子的氨基面外弯曲振动模的拉曼光谱
(2013-08-15)拉曼光谱是一种用途广泛的无损分子检测技术,其能够提供化学物质的分子结构指纹信息.一种面外弯曲振动模被称作WAggIng振动,它的信号尤为特殊,其频率和强度都非常依赖于检测环境.以乙烯胺和苯胺为例,采用密度泛函理论计算研究了P-π共轭分子分别与水簇和银簇作用的平衡结构、成键作用和拉曼光谱.结果表明,弱相互作用,如分子与金属表面的弱吸附作用以及分子与水之间的氢键作用,均使氨基面外弯曲振动模(ωnH2)的拉曼信号发生显著的变化.考虑溶剂化效应 ... -
p-取代2-硝基-1-苯乙醇对映体在ChiralcelOD和ChiralpakAD手性柱上的色谱拆分
(2012)为建立准确评价不对称合成反应和手性催化剂的立体选择性分析方法,采用CHIrAlCEl Od-H和CHIrAlPAk Ad-H手性柱,研究了7种P-取代2-硝基-1-苯乙醇对映体的高效液相色谱拆分特性.详细考察了手性柱类型、流动相中醇类调节剂对这些对映体色谱拆分行为的影响.结果表明:在优化实验条件下,7种P-取代2-硝基-1-苯乙醇对映体均可达到很好的基线拆分,并且方法简便、准确,适合于不对称亨利反应合成P-取代2-硝基-1-苯乙醇化合物的对映体纯度分析. -
P2-Na0.67 Alx Mn1-x O2 : Cost-Effective, Stable and High-Rate Sodium Electrodes by Suppressing Phase Transitions and Enhancing Sodium Cation Mobility.
(2019-12-09)Sodium layered P2-stacking Na0.67 MnO2 materials have shown great promise for sodium-ion batteries. However, the undesired Jahn-Teller effect of the Mn4+ /Mn3+ redox couple and multiple biphasic structural transitions ... -
P_7~+原子团簇及其特殊配位
(厦门大学, 2000-05)在激光产生的磷原子团簇正离子的质谱图中 ,P7+ 具有最强的谱峰 .使用分子图形软件设计出 2 4种 P7+ 的同分异构体 ,并进行分子力学、PM3半经验量子化学和 ADF密度泛函优化 .在磷原子团簇正离子模型中 ,磷原子采用二、三、四或六配位方式成键 .从各异构体成键能量的比较中可得知 ,最稳定的 P7+ 构型是在最稳定的 P6的双键位置增加 1个磷原子所生成的结构 .在磷原子六配位的结构中 ,d轨道参与成键 .具有平面或六配位原子的 ... -
PAH-biodegradation potential of indigenous microorganisms: evidence from the respiratory activity of surface sediments in the Quanzhou Bay in China
(CHINA OCEAN PRESS, 2009)Seven stations were established in the Quanzhou Bay (24.73 degrees-24.96 degrees N, 118.50 degrees-118.70 degrees E) in China on three cruises to determine the concentrations of polycyclic aromatic hydrocarbons (PAHs) and ... -
Paired-permanent approach for VB theory (II) - An ab initio spin-free VB program
(SCIENCE CHINA PRESS, 2001)Paired-permanent approach for VB theory is extensively developed. Canonical expansion of a paired-permanent is deduced. Furthermore, it is shown that a pal red-permanent may be expressed in terms of the products of ... -
Paired-permanent approach to valence bond theory
(SCIENCE CHINA PRESS, 1996)A new function called paired-permanent is defined and widely discussed, and a practicable procedure for evaluations of paired-permanents is proposed, which is similar to the Laplace method for determinants. Using the concept ... -
Palladium complexes with simultaneous O:S coordination, syntheses, structures and characterization of complexes with 2-mercaptophenol or 2-mercaptopyridine N-oxide
(1997)Complexes (Et(4)N)(2)[Pd-2(mp)(2)(Hmp)(2)] (1) and [Pd(mpo)(2)] (2) synthesized from the reactions of palladium chloride with 2-mercaptophenol (H(2)mp) and 2-mercaptopyridine N-oxide (Hmpo) or 2,2'-dithiobis(pyridine ... -
Palladium Concave Nanocubes with High-Index Facets and Their Enhanced Catalytic Properties
(WILEY-BLACKWELL, 2011-07-05) -
Palladium nanocrystals enclosed by {100} and {111} facets in controlled proportions and their catalytic activities for formic acid oxidation
(ROYAL SOC CHEMISTRY, 2012-04)This article reports a seed-mediated approach to polyhedral nanocrystals of Pd with controlled sizes, shapes, and different proportions of {100} to {111} facets on the surface. The success of this synthesis relies on the ... -
Palladium nanosheets as highly stable and effective contrast agents for in vivo photoacoustic molecular imaging
(ROYAL SOC CHEMISTRY, 2014)A stable and efficient contrast agent is highly desirable for photoacoustic (PA) imaging applications. Recently gold nanostructures have been widely reported and studied for PA imaging and photothermal therapy. However, ... -
Palladium(II)-Catalyzed Hydration of Alkynylphosphonates to beta-Ketophosphonates
(WILEY-V C H VERLAG GMBH, 2012-09)A highly efficient palladium(II)-catalyzed hydration of a wide range of alkynylphosphonates to the corresponding beta-ketophosphonates has been developed to give high yields at 80 degrees C in 1, 4-dioxane, with no acidic ... -
Palladium-catalyzed highly regio- and stereoselective addition of organoboronic acids to allenes in the presence of AcOH
(2003)The Pd-0-catalyzed regio- and stereoselective addition of organoboronic acids to allenes leads to stereodefined tri- or tetrasubstituted alkenes. Furthermore, this method shows high substitutent-loading capability and ...