Synthesis and Ionic Conductivity of Network Polymer Electrolytes with Internal Plasticizers

Network polymer electrolytes with free oligo(oxyethylene) chains as internal plasticizers were prepared by cross-linking poly(ethylene glycol) acrylates. The effects of salt concentration and properties of internal plasticizers on ionic conductivity were studied.     

紫杉醇的合成进展

紫杉醇是一种重要的抗癌药物,它具有复杂新颖的化学结构,为三环二萜类化合物.本文综述了紫杉醇的半合成和紫杉烷环的各种合成方法.     

Composite Electrode SnO2／TiO2 for Dye-Sensitized Solar Cells

Composite nanoporous electrode SnO2/TiO2 was fabricated for the dye sensitized solar cell (DSSC) with N3 (Cis-Ru). After introducing of TiO2, the open-circuit photovoltage (Voc) was higher than that of the pure SnO2 electrode, while short-circuit photocurrent (Isc) was varied with the ratio of the TiO2. Appropriate content of the TiO2 can be beneficial to the efficiency of the solar cell, and it gives negative impact on the composite electrode when the content of TiO2 is higher.     

STUDY ON THE NANOSECOND TRANSIENT ABSORPTION SPECTRA OF HYPOCRELLIN A

In this paper, the nanosecond transient absorption spectra and the fluorescence spectraof Hypocrellin A(HA) are examined in solvents of varying polarity. There are three absorp-tion bands in dilute HA solutions: Ⅰa, Ⅱa are defined as the triplet-triplet absorption ofHA, the band Ⅲa is supposed to be the absorption of the solvent--sepatated ion pair (SSIP).In more concentrated solutions, only the absorption of SSIP was observed. The effects ofsolvent polarity on transient absorption spectra and fluorescence spectra of HA and the effectof oxygen on the intensities of the fluorescence of HA are discussed. Then a reasonablemechanism for the photolysis of HA is proposed.     

1,1-二氟乙烷和1,2-二氟乙烷分子内原子间非键相互作用

用从头算势诱导极小二乘拟合(PD/LSF)和(exp-6-1)函数研究了1,1-二氟乙烷和1,2-二氟乙烷分子内非键原子间的相互作用。计算结果表明, 同分异构体的能量稳定性差, 在于分子内非键原子间的相互作用。该模式提供了一种简单、实用的研究分子内非键相互作用的方法。     

A New Diterpene Acid from the Flowers of Heteropappus altaicus

A new compound, named heteraltaic acid was isolated from the flowers of Heteropappus altaicus (willd) Novopokr. The compound was elucidated as (5R, 6S, 8aS) -5-[2-(3-furyl) ethyl-5, 6, 8a-trimethyl-4a, 5, 6, 7, 8, 8a -hexahydro-l-naphthalenecarboxylic acid] by the combination of 1D and 2D NMR techniques (HSQC, HMBC) and X-ray analysis.     

新型YS类高分子铑配合物催化甲醇羰基化反应制备乙酸和乙酐

以含有两种不同配位原子的线型或交联大孔球型共聚物为配体的新型铑配合物,能在温和条件下催化甲醇羰基化为乙酸和乙酐.实验结果表明,这些新型共聚物铑配合物具有鳌合型顺-二羰基铑(Ⅰ)的结构特征,并有良好的热稳定性及高的催化活性和选择性.     

CHARACTER OF SIMPLIFIED NAVIER-STOKES (SNS) EQUATIONS NEAR SEPARATION POINT FOR TWO-DIMENSIONAL LAMINAR FLOW OVER A FLAT PLATE

It is proved that the simplified Navier--Stokes (SNS) equations presented by Gao Zhi,Davis and Golowachof--Kuzbmin--Popof (GKP) are respectively regular and singular neara separation point for a two--dimensional laminar flow over a flat plate. The order of thealgebraic singularity of Davis and GKP equation near the separation point is indicated.A comparison among the classical boundary layer (CBL) equations, Davis and GKP equations,Gao Zhi equations and the complete Navier--Stokes (NS) equations near the separationpoint is given.     

The Unusual Spectrum of the Mixture of Tin-octabutoxy Naphthalocyanine and SnCl2 in CH2Cl2

The Q-band position of tin-centered 5, 9, 14, 18, 23, 27, 32, 36-octabutoxy 2, 3-phthalocyanine(SnNc(OBu)8) exhibits dramatic red-shift as mixed with SnCl2 in CH2Cl2.     

Determination of Size Distribution of Nano-particles by Capillary Zone Electrophoresis

A new method was developed for the determination of the size distribution of nano-particles by capillary zone electrophoresis (CZE). Scattering effect of nanoparticles was studied. This method for the determination of size distribution was statistical.