Electroactive polymers containing 3-arylcarbazolyl units as hole transporting materials for OLEDs

Monomers and their polymers containing 3-arylcarbazolyl electrophores have been synthesized by the multi-step synthetic route. The materials were characterized by thermo-gravimetric analysis, differential scanning calorimetry and electron photoemission technique. The polymers represent materials of high thermal stability having initial thermal degradation temperatures in the range of 331–411 °C. The glass transition temperatures of the amorphous polymeric materials were in the rage of 148–175 °C. The electron photoemission spectra of thin layers of monomers showed ionization potentials in the range of 5.6–5.65 eV. Hole-transporting properties of the polymers were tested in the structures of organic light emitting diodes with Alq₃ as the green emitter. The device containing hole-transporting layers of polyether with 3-naphthylcarbazolyl groups exhibited the best overall performance with a maximum current efficiency of 3.3 cd/A and maximum brightness of about 1000 cd/m².     

取代水杨醛Schiff碱金属配合物催化氧化脱硫性能

以水杨醛类Schiff碱为配体,与Co(NO_3)_2、Cu(NO_3)_2反应合成6种Salen(M)型配合物Ⅰ～Ⅵ。以1-己硫醇、二丁基硫醚和2-甲基噻吩为模型化合物配制模拟油体系,考察了配合物Ⅰ～Ⅵ的催化氧化脱硫性能,并分析了配合物结构与氧化脱硫性能的关系。结果表明,6种配合物在75 min时的总脱硫效果为Ⅵ>Ⅴ>Ⅳ>Ⅰ>Ⅲ>Ⅱ,Ⅵ的总脱硫率为31.9%。对1-己硫醇及二丁基硫醚脱除效果最佳的是Ⅴ,脱除率分别为74.2%和65.1%;对2-甲基噻吩脱除效果最好的是Ⅰ,脱除率为26.8%。构效关系研究表明,中心金属离子与O_2的配位能力越强,配体的共轭体系越大、电子云密度越高,配合物的脱硫性能越好;通过IR和离子色谱对单一硫化物模拟油体系氧化前后的产物进行分析发现,硫化物氧化后皆生成相应的砜类或亚砜类,且1-己硫醇和二丁基硫醚被进一步氧化生成SO_3~(2–)或SO_4~(2–)。     

Nucleophilic substitution onto poly(methylmethacrylate): 4. Dilute solution properties of substituted polymethacrylates

The morphological and hydrodynamic properties of a series of homogeneous fractions of substituted poly(methylmethacrylate) (A units) bearing keto-β-functional groups (B units) of the general structureCOCH₂R, with R = SO_xCH₃ (x = 1,2) or SO₂N(CH₃)₂, were investigated by intrinsic viscosity, light scattering and partial specific volume measurements in dimethylformamide (DMF) solution at 25°C. For molar substitution degrees $\text{DS}{}_{\mathrm{m}}\text{< 0.5}$, the copolymers behave as flexible random coils. The Stockmayer-Fixman-Yamakawa analysis of the $\text{[η]-}\text{M}\text{?}{}_{\mathrm{w}}$ data leads to slightly higher unperturbed dimensions K_o and steric factor σ than those for PMMA, and to stronger chain expansion as a result of the weak hydrogen bonding between DMF and COCH₂R units and a positive X_AB interaction parameter. For $\text{DS}{}_{\mathrm{m}}\text{> 0.5}$ however, copolymers bearing COCH₂SO₂N(CH₃)₂ groups behave as worm-like chains, as derived from the Fujii-Yamakawa analysis of the $\text{[η]-}\text{M}\text{?}{}_{\mathrm{w}}\text{-}\text{v}\text{?}$ data: the persistence length increases from 380 to 570 Å within the $\text{DS}$_m range 0.57–0.75. This transition from a random coil to a worm-like chain for $\text{DS}{}_{\mathrm{m}}\text{> 0.5}$ was tentatively correlated with the accumulation of B units in sterically hindered and self-associated short blocks of average length l_B ? 1.6 which provide drastically increased rigidity to the copolymer chain.     

Functionally substituted tetramethylcyclopentadienes: Synthesis of 1-(p-hydroxyphenyl)-2,3,4,5-tetramethylcyclopentadiene and its use in the synthesis of an organometallic polymer

Reaction of 2,3,4,5-tetramethylcyclopent-2-enone (1) withp-LiC₆H₄OC-Me₂OMe, followed by treatment with aqueous acid afforded 1-(p-hydroxyphenyl)-2,3,4,5-tetramethylcyclopentadiene (2). This new ligand was then used in the synthesis of the functionally substituted organomolybdenum reagent (⁵-C₅Me₄-p-C₆H₅OH)Mo(CO)₂(NO) (3). Treatment of a preformed 1/1 styrene/maleic anhydride copolymer ( ) with 5 mol% 3 led to chemical incorporation of the organometallic species into the polymer. The final product contained 3 mol% of the organometallic moiety.     

QSAR结合人工神经网络方法研究取代芳烃分子结构与Na-K-ATP酶活性

运用函数连接型神经网络研究 3 8种取代芳烃化合物的分子结构—毒性的定量构效关系 (QSAR) ,计算结果与MLR计算结果比较 ,前者比后者好。与实验结果的线性拟合相关系数 ,FLN所得结果为 0 9561～ 0 9996,MLR所得结果为 0 869～ 0 965。     

掺杂六铝酸盐LaMnMxAl11-xO19-δ的制备及高温催化性能

以Triton X-100/正已醇/环己烷组成的反相微乳液为媒介,采用反相微乳-共沉淀法制备系列金属掺杂的六铝酸盐LaMnMxAL11-xO19-δ(M为Ni,Co)催化剂,用BET,XRD进行物性表征,确定最佳焙烧温度,以甲烷燃烧为探针反应考察催化剂的催化活性,以Ni掺杂的六铝酸盐催化剂为对象,研究了反相微乳体系中前驱溶液浓度对催化剂性能的影响.结果表明,1 200℃左右可以形成完整的六铝酸盐晶型,并具有较高的催化性能;金属Co的存在可以促进六铝酸盐晶相的形成,而降低成晶温度;金属Ni可以明显提高催化剂的高温活性.反相微乳液中前驱液离子浓度对催化剂的比表面积、粒径及催化活性有一定影响.     

基于挣值管理的项目工期成本优化分析

基于挣值管理的思想,论文利用计量模型建立成本、工期、质量函数关系,对项目在实施阶段某一时刻的状态进行分析,运用工期成本之间的替代关系为项目经理人提供决策的依据与控制方向,实现项目最优管理.     

硫醇作亲核试剂在有机合成中的应用

概括硫醇作为亲核试剂与环氧化合物和氮杂环丙烷类化合物加成反应、与酰氯、酸酐、酰胺、酯和羧酸的酰化反应及与醇和卤代烃的亲核取代反应。     

Effect of Fe doping on structure,magnetic and electrical properties La0.7Ca0.3Mn0.5Fe0.5O3 manganite

The crystal and magnetic structures of La_0.7Ca_0.3Mn_0.5Fe_0.5O₃ compound have been studied by neutron powder diffraction in the temperature range of 10–300 К. The magnetization and electrical resistivity measurements have been also performed in the temperature range of 5–300?K in magnetic fields up to 1?T. These experimental results indicate a formation of a complex magnetic state in which the long-range antiferromagnetic G-type phase coexists with the short-range ferromagnetic clusters. The electrical conductivity of La_0.7Ca_0.3Mn_0.5Fe_0.5O₃ demonstrates an anomalous temperature behavior suggesting a switching between different states. The origin of the unconventional magnetic state, the mechanisms of the electrical conductivity, and correlation between magnetic and transport properties in this manganite have been discussed.     

1-磺甲基四氮唑-5-硫醇双钠盐的合成

研究了头孢尼西的侧链１－磺甲基四氮唑－５－硫醇双钠盐的合成。以亚硫酸氢钠、甲醛、氨水为原料，经五步反应可制备１－磺甲基四氮唑－５－硫醇双钠盐，五步反应总收率为１０．８％ 。在原文献的基础上，作了一些改进，最主要的是第三步的烷基化试剂由溴乙烷替代碘甲烷，降低了工业成本，使本工艺易于工业化。