(+)-樟脑缩苄胺体系的不对称羰基加成反应

本文通过(+)-樟脑缩苄胺(I)与不同醛、酮的不对称加成, 经转氨合成了1,2-取代-2-氨基乙醇(2), 反应的非对映选择性经NMR测定为16-70%de.; 苏式、赤式异构体的含量比由HPLC法测定, 其值接近1, 由于立体位阻的原因加成反应发生在锂化物3的Re面。     

Fabrication and characterization of multi-component organosilane nanofilms

Multi-component micropatterned organosilane monolayers are fabricated on a Si-wafer substrate by stepwise site-specific vacuum ultraviolet (VUV)-ray photodecomposition and chemisorption. The introduction of different organosilane components is confirmed by X-ray photoelectron spectroscopy (XPS). Atomic force microscopic and lateral force microscopic observations reveal that the line-widths of the micropatterned surface correspond to those of the photomask. Contact angle measurement reveals that the micropatterning of the surface functional groups influences the magnitudes of surface free energy. A line pattern with high wetting contrast shows anisotropic water condensing behavior. Also, the patterned surface is used for the site-specific polymerization and site-specific adsorption of microparticles.     

Surface modification of medical PVC by remote oxygen plasma

Surface modification of medical PVC by remote oxygen plasma has been studied: surface structure and performance of treated material are analyzed by weight loss rate, contact angle measurement and XPS. With the increase of sample distance from the plasma source, weight loss rate drops, electrons and ions and etching action are restrained; and C=O groups are found in the treated PVC surface. The surface wettability of PVC film can be improved by remote low-temperature plasma and the radical reaction is intensified.     

Evolution of Dimensionless Angular Momentum of Central Black Holes of Accretion Disks

The effects of the Blandford-Znajek (BZ) process on the evolution of the central black holes of accretion disks are investigated. It is proved that the dimensionless angular momentum a_* of the central black hole will evolve to a stable value in the case of thin disks, while it will evolve to a stable value in the case of thick disks. These results imply that the central black holes of accretion disks will never evolve to extreme Kerr black holes.     

STUDY ON PHOTO-INDUCED ORIENTATION OF A NOVEL PHOTO-ALIGNMENT FILM WITH SURFACE ENHANCED RAMAN SCATTERING （SERS） SPECTROSCOPY

Surface enhanced Raman scattering (SERS) spectroscopy was first utilized to study the photo-orientation behaviour of the photoreactive groups on a novel photo-alignment film surface and elucidate the generation mechanism of pretilt angle. The novel photo-alignment film was prepared by spin-coating a solution of ladderlike polysiloxane (LPS) bearing dual photoreactive group on an ITO surface and by irradiation with linear-polarized ultraviolet (LPUV) light. A Si-H terminal compound (M) containing an identical photosensitive part has been used to fabricate a model film for SERS investigation.     

Effect of Pt loading on the photocatalytic reactivity of titanium oxide thin films prepared by ion engineering techniques

Platinum-loaded titanium oxide thin-film photocatalysts were prepared by using an ionized cluster beam (ICB) deposition method and a RF magnetron sputtering (RF-MS) deposition method as dry processes. From the results of the photocatalytic oxidation of acetaldehyde with O₂ under UV light irradiation, small amounts of Pt loading (less than 10 nm film thickness) were found to dramatically enhance the photocatalytic reactivity. However, when TiO₂ thin films were loaded with relatively larger amounts of Pt (more than 30 nm as the film thickness), the photocatalytic reactivity became lower than for the pure TiO₂ thin films. Moreover, investigations of the ratio of Pt loaded onto the surface of the thin film catalysts by XPS measurements revealed that the small amounts of Pt loaded exist as very small clusters working to efficiently enhance the charge separation, whereas, large amounts of Pt covers the entire surface of the TiO₂ thin films, resulting in a decrease of the photocatalytic reactivity.     

钴(II)-丁二肟体系的吸附伏安法研究

本文对钴(II)与丁二肟配合物Co(II)A2在悬汞电极上的吸附伏安法作了研究。在-0.60～-0.90V(vs.SCE)Co(II)A2能在悬汞电极上很好地吸附,当电极向阴极方向扫描时,吸附在电极上的Co(II)A2分二步不可逆地还原到Co(O)(Hg)。本文导出了在低覆盖度下富集阶段电极表面吸附量的表达式,实验结果与理论推导相符.理论上分析了不可逆过程线性扫描吸附伏安法的灵敏度,影响灵敏度的主要因素是吸附富集时间,当富集120秒时,检测下限可达1x10[-9]M,此结论得到实验证实。     

异氰酸酯的反应

我们研究了芳基和烷基异氰酸酯在消耗性镁阳极存在下的有机电解反应。芳基异氰酸酯电解得N, N'-二取代脲, 烷基异氰酸酯则还原偶联为N, N'-二取代草酰胺。我们认为这是由于烷基异氰酸酯从阴极得到电子发生比分子偶联, 芳基异氰酸酯则是与阴极析出的高分散的活性镁起作用。     

Fragment interaction analysis based on local MP2

We have developed a fragment interaction analysis based on local MP2 (FILM) in the context of the fragment molecular orbital (FMO) scheme. The primary purpose of this work is to provide a tool for analyzing inter-fragment interaction associated with dispersion interactions in a large molecule such as protein and DNA. Our implementation of local MP2 (LMP2) is based on the algorithm developed by Pulay and Werner. A potential of FILM was demonstrated using the human immunodeficiency virus type 1 protease (HIV-1 PR) complexed with lopinavir (LPV). The total energy, binding affinity, and inter-fragment interaction energy (IFIE) by the FMO method using LMP2 were compared with those obtained by canonical MP2 and the site-specific information in dispersion interaction was obtained. It turned out that the FILM is a useful tool for analyzing the dispersion interaction between an amino acid residue and a specific site of a ligand.     

Pb及Pb-7w/O Sb合金在氧析出电位区生长的阳极膜

分别测量了Pb及Pb-7w/0Sb在4.5mol.dm^-^3H^2SO~4(30℃)中于1.3和1.5V(vs.Hg/Hg~2SO~4/4.5mol.dm^-^3H^2SO~4)下在不同时间生长的阳极膜的交流阻抗谱, 并使用线性电位扫描法分析了上述阳极膜的相组成。讨论了上述阳极膜进行的电化学反应的机理, 并据此提出它们的等效电路。实验结果表明上述阳极膜的真实表面积随生长时间而增加, 该膜多孔, 主要由外层为PbO~2的PbO.PbSO~4微粒组成, 锑能显著抑制PbO~2的生长, 特别是在1.3V时。