聚合物-卟啉钴复合膜的氧气促进输送性能

综述了聚合物－卟啉钴复合膜的氧气促进输送性能。讨论了卟啉钴的结构及与氧的结合性能，聚合物－卟啉钴复合膜的氧气促进输送特性，影响聚合物－卟啉钴复合膜氧气透过性能的因素及卟啉钴的不可逆氧化反应机理。     

ADSORPTION CHARACTERISTICS OF L-HISTIDINE ON ACTIVE CARBON

1. INTRODUCTION L-histidine is a kind of semi-essential amino acid in human and animal body. In the medicinal field, L-his is mainly used for amino acid transfusion and intergrated amino acid formulation. In addition, L-his is production material for medicine of peptic ulcer and heart circulation, and histidine hydrochloride is also used as food additives [1,2]. Quantity requirement of L-his is rising in recent years and the production scale of L-his is expanded step and step. So it is …     

真空电子偶素原子的产生

用慢正电子束入射固体靶表面,通过测量湮没光子能谱随靶温度和入射慢正电子能量的变化,用“峰法”确定慢正电子产生电子偶素原子的转换率。转换率依赖于靶材料、靶温度和入射慢正电子能量。对材料锗转换率可达80％。 关键词：     

Si5P6O25∶Tb3+的结构与荧光性质

Tb³⁺ ions were incorporated in P-Si matrix material through a sol-gel process. Luminescence properties of Tb³⁺ as a function of dopant， firing temperature， composition and structure of matrices were investigated. The gels synthesized by the reaction of P₂O₅ or H₃PO₄ with tetraethoxy silane and TbCl₃ as dopant were fired in air from the temperature 25～1000℃ to form P-Si crystalline phase. The crystal structure was determined by powder X-ray diffraction. Si₅O(PO₄)₆ were the only crystalline phase and belong to hexagonal crystal system. The emission of ⁵D₄-⁷F₅(～545nm) transition of Tb³⁺ in the P-Si system is composed of two peaks. The amount of doping Tb³⁺ varied from 0.664% to 1.644%， and no obvious concentration quenching was observed in this doping concentra-tion range. The intensity of Tb³⁺ emission increased with firing temperature increasing and becomes stable at 800～1000℃.     

Eu3+掺杂SiO2-B2O3-NaF玻璃的制备及发光性质

The Eu-doped SiO₂-B₂O₃-NaF glass was prepared by sol-gel process, using tetraethoxy Silicane, boric acid and sodium fluoride as starting materials, 0.10 mol·L^-1 EuCl₃ solution as the dopant. The luminescent properties of Eu³⁺ doped SiO₂-B₂O₃-NaF phosphors were investigated. The phosphors showed prominent luminescence in pink, the strong emission of Eu³⁺ comes from electronic transition of ⁵D₀- ⁷F₁（591 nm）and ⁵D₀- ⁷F₂（615 nm）,which derived from two transition modes of magnetic-dipole and electric-dipole .The peak intensity of 591nm in SiO₂-B₂O₃-NaF matrix is much stronger than it in the other matrixes, it means that SiO₂-B₂O₃-NaF has sensitization on the transition of ⁵D₀- ⁷F₁ (Eu³⁺). If there are broad bonds in the range of 275～380 nm in the excitation spectrum of Eu³⁺ -doped SiO₂-B₂O₃-NaF glass, the emission peak intensity should be intensified. It is because the electron migration CT band of O^2--Eu³⁺. For all Eu³⁺ concentrations used, the investigation found that when the mass of fraction got to 29.19×10^-3, the luminescence intensity reached the summit. And there is a phenomenon of concentration quenching. Investigation with the same concentration of Eu³⁺ at different annealed temperature, we found that the sample annealed at 400 ℃, the luminescence intensity achieved its maximum value, and Eu³⁺ in this matrix had a phenomenon of temperature quenching. The structural characterization of these luminescent materials was carried by used XRD and TEM. The result showed that the phosphor was in amorphous phase.     

黄连素-染料木素有机盐水合物的制备、晶体结构及溶解性

合成了黄连素和染料木素的有机盐水合物[C₂₀H₁₈NO₄]⁺·[C₁₅H₉O₅]^-·2.5H₂O·0.5(C₂H₅OH),并测定了其晶体结构。 解析结果表明,该有机盐水合物属于单斜晶系,P2₁/c空间群。 染料木素7取代位的羟基失去了质子变成了染料木素阴离子。 羟基阴离子与4'取代位上的羟基形成了O—H••••O^-氢键,产生了一维的氢键链状结构。 两个水分子通过氢键作用形成了链状结构,并与染料木素阴离子形成二维的氢键结构。 加热失去水分子后,有机盐水合物变成无定型状态。 在乙醇水溶液中悬浮后,无定型可以转变成结晶的水合物结构。 形成黄连素-染料木素有机盐水合物后,染料木素在水中的溶解度略有增加。     

X-Ray Structure of 8-Quinolinolato Lanthanide Complex: (8-Quinolinolato)bis(2,6-di-tert-butyl-4-methylphenoxo)samarium

Ｉｎｔｒｏｄｕｃｔｉｏｎ8 Ｈｙｄｒｏｘｙｑｕｉｎｏｌｉｎｅｉｓａｃｌａｓｓｉｃａｌｃｈｅｌａｔｉｎｇａｇｅｎｔｆｏｒｔｒａｎｓｉｔｉｏｎｍｅｔａｌｓａｎｄｌａｎｔｈａｎｉｄｅｓ .Ｒｅｃｅｎｔｌｙｍｅｔａｌｃｏｍ ｐｌｅｘｅｓｉｎｃｏｒｐｏｒａｔｉｎｇ 8 ｑｕｉｎｏｌｉｎｏｌａｔｏｌｉｇａｎｄｓｈａｖｅｒｅｃｅｉｖｅｄｍｏｒｅａｎｄｍｏｒｅａｔｔｅｎｔｉｏｎ .Ｔｈｅｒｅｓｅａｒｃｈｉｎｔｅｒｅｓｔｐｒｏｂａｂｌｙａｒｉｓｅｓｆｒｏｍｔｗｏａｓｐｅｃｔｓ .Ｆｉｒｓｔ,8 ｑｕｉｎｏｌｉｎｏｌａｔｏｍｅｔ…     

Syntheses and Crystal Structures of Sm(OAr)+2(THF)+3·THF and Sm(OAr)_2(DME)_2 (Ar =C_6H_2-tert-Bu_3-2,4,6)

1 INTRODUCTION The chemistry of divalent lanthanocenes has de- veloped rapidly. Attempts to extend the chemistry beyond the traditional realm of the lanthanocenes have led to the syntheses and structural characteri- zations of a number of lanthanide (II) complexes bearing various ligand systems. Aryloxide ligands have been attractive for their strong bonds with lan- thanide atoms and readily steric modification by the choice of substituents. A series of divalent lantha- nide aryloxides …     

乙烯基混金属羰基簇取代衍生物的合成和分子结构

The mono- and di- substituted derivatives of the parent cluster {μ₃-H(Ph)C=C}FeCo₂(CO)₉ (1) have been synthesized by facile substitution reactions. The compound {μ₃-H(Ph)C=C}FeCo₂(CO)₇(dppe) (2)， {μ₃-H(Ph)C=C}FeCo₂(CO)₈(PPh₃) (3) and {μ₃-H(Ph)C=C}FeCo₂(CO)₈(AsPh₃) (4) were characterized by elemental analysis， IR， ¹H ，³¹P NMR， MS and X-ray crystallography. The new cluster 2 crystallizes in monoclinic space group P2₁/n， with a=0. 8614(5)nm， b=1.6404(8)nm， c=2.6574(14)nm， β=96.3222(12)°， V=3.732(3)nm³， Z=4， S=0.886， Δρ_max=0.335e·nm^-3， Δρ_min=-0.379e·nm^-3. Final R indices [I >2σ(I)]： R₁=0.0432， wR₂=0.0695. CCDC： 164600.     

手性氨基醇在不对称催化中的应用及新进展

综述了手性氨基醇作为配体或催化剂在不对称合成中的应用及最新进展。