MolecularElectronegativityinDensityFunctionalTheory（V）－－RelaionshipBetweentheGlobalandHarmonicMeanElectronegativitiesforaMolecle￣

ＭｏｌｅｃｕｌａｒＥｌｅｃｔｒｏｎｅｇａｔｉｖｉｔｙｉｎＤｅｎｓｉｔｙＦｕｎｃｔｉｏｎａｌＴｈｅｏｒｙ（Ｖ）－－ＲｅｌａｉｏｎｓｈｉｐＢｅｔｗｅｅｎｔｈｅＧｌｏｂａｌａｎｄＨａｒｍｏｎｉｃＭｅａｎＥｌｅｃｔｒｏｎｅｇａｔｉｖｉｔｉｅｓｆｏｒａＭｏｌｅ...     

An Explanation on the Electron Ionization Mass Spectra of Crown Ethers by MNDO Computational Method

ＡｎＥｘｐｌａｎａｔｉｏｎｏｎｔｈｅＥｌｅｃｔｒｏｎＩｏｎｉｚａｔｉｏｎＭａｓｓＳｐｅｃｔｒａｏｆＣｒｏｗｎＥｔｈｅｒｓｂｙＭＮＤＯＣｏｍｐｕｔａｔｉｏｎａｌＭｅｔｈｏｄＹＵＡＮＨｕ－ｓｈａｎ，ＴＡＮＧＭｉｎｇ－ｓｈｅｎｇａｎｄＷＵＹａｎｇ－ｊｉｅ（...     

STUDIES ON THE SYNTHESIS OF SESAMIN－GROUP LIGNANS V． A CONVENIENT METHOD FOR THE PREPARATION OF 2－ARYL－4－PHENYLOXAZOLES

ＳＴＵＤＩＥＳＯＮＴＨＥＳＹＮＴＨＥＳＩＳＯＦＳＥＳＡＭＩＮ－ＧＲＯＵＰＬＩＧＮＡＮＳＶ．ＡＣＯＮＶＥＮＩＥＮＴＭＥＴＨＯＤＦＯＲＴＨＥＰＲＥＰＡＲＡＴＩＯＮＯＦ２－ＡＲＹＬ－４－ＰＨＥＮＹＬＯＸＡＺＯＬＥＳ￥Ｃｏｒｒｅｓｐｏｎｄｅｎｔａｕｔｈｏｒ．２－ａｒｙｌ－４－ｐｈｅｎｙｌｏｘａｚｏｌｅｓ．Ｔｈｅｏｔｈｅｒｏｌｌｅｂｙｔｈｅｒｅａｃｔｉｏｎｏｆａ－ｍｅｔｈｙｌｐｈｅｎａｃｙｌｂｅｎｚｏａｔｅｗｉｔｈａｍｍｏｎｉｕｍａｃｅｔａｔｅｉｎｂｏｉｌｉｎｇａｃｅｔｉｃａｃｉｄｔｏｆｏｒｍａｆｕｔｕｒｅｏｆ２，４－ｄｉｐｈｅｎｙｌ－５ｍｅｔｈｙｌｏｘａｚｏｌｅａｎｄ２，４－ｄｉｐｈｅｎｙｌ－５－ｒｎｅｔｈｙｌｉｎｄｄａｚｏｌｅｂｏｔｈｉｎａｂｏｕｔ４０％ｙｉｅｌｄ，ｈｉｌｔｔｉｌｌｓｍｅｔｈｏｄｉｓａｐｐｌｉｃａｂｌｅｆｏｒｔｈｅｐｒｅｐａｒａｔｉｏｎｏｆ２－ａｒｙｌ－４－ｐｈｅｎｙｌｏｘａｚｏｌｅｓ．Ｂｙａｎａｌｏｇｙ，ｐｌｉｅｎａｃｙｌｂｅｎｚｏａｔｅｉｓａｌｌｏａｌｌｏｗｅｄｔｏｒｅａｃｔｗｉｔｈａｌｎｍｏｎｉｌｌｍａｃｅｔａｔｅｉｎｂｏｉｌｉｎｇａｃｅｔｉｃａｃｉｄ．Ａｍｉｘｔｕｒｅｏｆ２，４－ｄｉｐｈ     

Synthesis of 2-Methylenesuccinimides Modified by Germatranes

Ｓｙｎｔｈｅｓｉｓｏｆ２－ＭｅｔｈｙｌｅｎｅｓｕｃｃｉｎｉｍｉｄｅｓＭｏｄｉｆｉｅｄｂｙＧｅｒｍａｔｒａｎｅｓＺｈｏｎｇＢｉａｏＺＨＡＮＧ；ＲｕＹｕＣＨＥＮ（ＩｎｓｔｉｔｕｔｅｏｆＥｌｅｍｅｎｔｏ－ＯｒｇａｎｉｃＣｈｅｍｉｓｔｒｙＮａｎｋａｉＵｎｉｖ...     

REACTION OF ORGANODILITHIUM REAGENT WITH α,α''''-DIHALO-o-XYLENE

ＲＥＡＣＴＩＯＮＯＦＯＲＧＡＮＯＤＩＬＩＴＨＩＵＭＲＥＡＧＥＮＴＷＩＴＨα，α'－ＤＩＨＡＬＯ－ｏ－ＸＹＬＥＮＥ￥ＨａｉＨｏｎｇＨＵＡＮＧ（ＩｎｓｔｉｔｕｔｅｏｆＭａｔｅｒｉａＭｅｄｉｃａ，ＣｈｉｎｅｓｅＡｃａｄｅｍｙｏｆＭｅｄｉｃａｌＳｃｉｅｎｃｅ?..     

Crystal Structure of Ethyl Ester N－（Isopropylcarbamoyl－Methoxyphosphonyl）－（1）－α－Phenylalanine

ＣｒｙｓｔａｌＳｔｒｕｃｔｕｒｅｏｆＥｔｈｙｌＥｓｔｅｒＮ－（Ｉｓｏｐｒｏｐｙｌｃａｒｂａｍｏｙｌ－Ｍｅｔｈｏｘｙｐｈｏｓｐｈｏｎｙｌ）－（１）－α－ＰｈｅｎｙｌａｌａｎｉｎｅＣｈｅｎＲｕ－Ｙｕ；ＬｉＨｕｉ－Ｙｉｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＥｌｅｍｅ...     

Permselectivity of 4－Aminophenol，Paracetanol and Phenacetin on the Self－Assembled n－Alkanethiol Monolayer Modified Gold Electrode

Ｐｅｒｍｓｅｌｅｃｔｉｖｉｔｙｏｆ４－Ａｍｉｎｏｐｈｅｎｏｌ，ＰａｒａｃｅｔａｎｏｌａｎｄＰｈｅｎａｃｅｔｉｎｏｎｔｈｅＳｅｌｆ－Ａｓｓｅｍｂｌｅｄｎ－ＡｌｋａｎｅｔｈｉｏｌＭｏｎｏｌａｙｅｒＭｏｄｉｆｉｅｄＧｏｌｄＥｌｅｃｔｒｏｄｅＬｉＪｉｎｇ－ｈ...     

An Electrochemical Study of Prussian Blue Microcrystalines Mixed in PEO_400 Polymer Electrolyte by Solid-state Voltammetry

ＡｎＥｌｅｃｔｒｏｃｈｅｍｉｃａｌＳｔｕｄｙｏｆＰｒｕｓｉａｎＢｌｕｅＭｉｃｒｏｃｒｙｓｔａｌｉｎｅｓＭｉｘｅｄｉｎＰＥＯ４００ＰｏｌｙｍｅｒＥｌｅｃｔｒｏｌｙｔｅｂｙＳｏｌｉｄ┐ｓｔａｔｅＶｏｌｔａｍｍｅｔｒｙＧＵＯＬｉ－ｐｉｎｇａｎｄＬＩＮＸｉａ...     

Study on the Methods Of Adsorbent Enriching－SFE Desorbing and Off－line GC－MS－DS Determination of Trace Organic Pollutants from Coal Smoke

ＳｔｕｄｙｏｎｔｈｅＭｅｔｈｏｄｓＯｆＡｄｓｏｒｂｅｎｔＥｎｒｉｃｈｉｎｇ－ＳＦＥＤｅｓｏｒｂｉｎｇａｎｄＯｆｆ－ｌｉｎｅＧＣ－ＭＳ－ＤＳＤｅｔｅｒｍｉｎａｔｉｏｎｏｆＴｒａｃｅＯｒｇａｎｉｃＰｏｌｌｕｔａｎｔｓｆｒｏｍＣｏａｌＳｍｏｋｅＺｈａｏＪｉ...     

Electochemistry and Electrocatalysis Investigation of the Tungstopalladate Heteropolyanion Modified

ＥｌｅｃｔｏｃｈｅｍｉｓｔｒｙａｎｄＥｌｅｃｔｒｏｃａｔａｌｙｓｉｓＩｎｖｅｓｔｉｇａｔｉｏｎｏｆｔｈｅＴｕｎｇｓｔｏｐａｌｌａｄａｔｅＨｅｔｅｒｏｐｏｌｙａｎｉｏｎＭｏｄｉｆｉｅｄＥｌｅｃｔｒｏｄｅＸＩＥＹａｎ，ＳＵＮＷｅｎ－ｌｉａｎｇ，ＬＩＵＨｕ...     

Poly（meta-phenylene） Derivative with Rigid Twisted Biphenyl Units in Backbone： Synthesis, Structural Characterization, Photophysical Properties and Electroluminescence

A soluble poly(meta-phenylene)derivative with rigid twisted biphenyl unit was synthesized by the Yamamoto coupling reaction.The polymer is soluble in common organic solvents,and the number-average molecular weight is about 6500.The UV-Vis and quantum chemical calculation indicate that the different conformation segments named "conformers" exist in the polymer backbones;it was also further confirmed by the single crystal X-ray diffraction study of the dimeric model compound.The π-π transition of biphenyl segments of twisted and planar conformations made the polymer exhibit a strong absorption around 256 nm and a weak absorption at about 300 nm.Furthermore,the polymer exhibits a strong UV photoluminescence at 372 nm when the excitation wavelengths are longer than 300 nm.The ultraviolet-emitting electroluminescence(EL)device with the single layer structure shows EL λmax of the derivative at 370 nm.     

Optical properties of a novel fluorene‐based thermally stable conjugated polymer containing pyridine and unsymmetric carbazole groups

A new diiodo monomer containing heterocyclic pyridine and carbazole groups was synthesized via Chichibabin reaction and used in the preparation of a conjugated polymer via Suzuki coupling approach. The conjugated polymer was highly soluble in common organic solvents such as NMP, THF, dichloromethane, chloroform, toluene, xylene, and benzene at room temperature. The polymer had high glass transition temperature at 191 °C and T_d10 at 434 °C in nitrogen atmosphere. The pristine polymer exhibited the UV–vis maximum absorption at 355 nm and shifted to 420 nm after protonation. The emission of the polymer in THF solution changed from the blue region with maximum peak at 400 nm to the yellow region with maximum peak at 540 nm after protonated by HCl, and the intensity of emission depended on the concentration of acid. The polymer also showed electrochromic behavior under applied voltage. The emission color of the polymer film changed from blue (435 nm) to yellow (570 nm) when 2.5 V bias voltage was applied. The polymer also exhibited write‐once and read‐many‐times (WORM) polymer memory effect with tristable states. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 991–1002, 2009     

Interaction of cylindrical polymer brushes in dilute and semi-dilute solution

We present a systematic study of flexible cylindrical brush-shaped macromolecules in a good solvent by small-angle neutron scattering (SANS), static light scattering (SLS), and by dynamic light scattering (DLS) in dilute and semi-dilute solution. The SLS and SANS data extrapolated to infinite dilution lead to the shape of the polymer that can be modeled in terms of a worm-like chain with a contour length of 380 nm and a persistence length of 17.5 nm. SANS data taken at higher polymer concentration were evaluated by using the polymer reference interaction site model (PRISM). We find that the persistence length reduce from 17.5 nm at infinite dilution to 5.3 nm at the highest concentration (volume fraction 0.038). This is comparable with the decrease of the persistence length in semi-dilute concentration predicted theoretically for polyelectrolytes. This finding reveals a softening of stiffness of the polymer brushes caused by their mutual interaction.     

三苯胺-噁二唑超支化共轭聚合物的多光子泵浦绿色荧光

采用钯催化Heck反应制备了一种新型三苯胺-噁二唑超支化荧光聚合物PI. 用飞秒Ti:sapphire激光研究了PI的三光子和双光子上转换荧光光谱, 激发波长位于近红外区(800~1350 nm). 在1280 nm和80 fs激光激发下, PI的三光子上转换荧光发射波长分别为525 nm(THF), 534 nm(CH2Cl2)和578 nm(DMF). 在800 nm和150 fs激光激发下, PI的双光子上转换荧光发射波长分别为527 nm(THF), 532 nm(CH2Cl2)和573 nm(DMF). 采用非线性透过率法测定荧光聚合物PI的三光子和双光子吸收系数. 系统研究了PI的线性吸收和透过、单光子荧光、荧光寿命、前线轨道能级及热稳定性. 实验结果表明, 三苯胺-噁二唑超支化共轭聚合物的多光子吸收和上转换荧光发射性能比树型分子或线型聚合物更为优异.     

Study of the degradation of polyurethanes. III. Mechanism of the photodegradation of polyurethane

The effect of triplet sensitizers, benzophenone and anthraquinone and metal acetylacetonates [Co(II, III), Cu, Sn, and Ni] on the photodegradation of polyurethane was examined. Ultravioletvisible (UV-V) absorption spectra, gel formation, and luminescence emission of the polymer before and after irradiation were measured. Changes in UV-V absorption of the polymer and the formation of an insoluble fraction in the polymer were accelerated in the presence of the triplet sensitizers, and (Co(II, III)), Cu, and Sn acetylacetonates. Unirradiated polyurethane was excited by irradiation at 290 and 346 nm, and emitted light at 310 and 420 nm. After 1/2 hr irradiation emission of luminescence was observed at 430 nm, excitation at 290 and 346 nm; after 2hr irradiation at 530 nm, excitation at 420 nm was observed. The results suggest that photodegradation of the polyurethane proceeds via excited triplet states forming excimer between the polymers at the initial stage and exciplexes between the polymer and degradation products or intermediates after a certain irradiation.     

Capillary zone electrophoresis of rigid submicron-sized particles in polyacrylamide. Solution selectivity, peak spreading and resolution.

Submicron-sized rigid particles can be separated in a size-dependent fashion by electrophoresis in free solution. Yet it has remained unknown whether the presence of polymers in the solution confers an advantage in size-dependent separation of submicron particles and their resolution. The present study addresses that question, using capillary zone electrophoresis of carboxylate modified polystyrene latex microspheres of 55, 140 and 215 nm radius in solutions of linear polyacrylamide in the M(r) range of 0.4.10(6) to 1.14.10(6). Selectivity of particle separation increases in direct relation to the polymer concentration in the concentration range of 0 to 1% (w/v). Selectivity was found to increase with M(r) of the polymer for the particle sets of 55/140 (nm/nm) and 140/215 (nm/nm) but to decrease with polymer M(r) for the 55/215 (nm/nm) set. Peak spreading is a complex and, in the case of the largest particle, non-monotonic function of polymer concentration, with a minimum at concentrations around the entanglement threshold, c*. Consequently, resolution of the 55/215 and 140/215 (nm/nm) sets also exhibits a maximum around the entanglement threshold while resolution for the 55/140 (nm/nm) set increases with a rise of polymer concentrations above c*. Within the range of optimally resolving polymer concentrations there also occurs a maximum of resolution for all particle sets at a field strength in the range of 150 to 250 V cm-1.     

157-nm Laser ablation of polymeric layers for fabrication of biomolecule microarrays

A new methodology for protein microarray fabrication is proposed based on the ablation of polymer film using laser at 157 nm (F₂). The polymer has been selected among others with the criterion of negligible protein adsorption. Improved results have been obtained by pretreatment of the polymer surface with an inert protein. The use of 157-nm laser radiation allowed very good depth control during the polymeric layer ablation process. In addition the importance of laser ablation at 157 nm is based on the fact that irradiated surfaces indicate limited chemical change due to the fact that laser ablation at 157 nm is only photochemical, thus avoiding excessive surface heating and damage. Results of protein microarray fabrication are presented to illustrate the viability of the proposed method.     

Influence of polymer molecular weight on the chemical modifications induced by UV laser ablation

This paper investigates the influence of polymer molecular weight (M(W)) on the chemical modifications of poly(methyl methacrylate), PMMA, and polystyrene, PS, films doped with iodonaphthalene (NapI) and iodophenanthrene (PhenI), following irradiation at 248 nm (KrF excimer laser, 20 ns fwhm and hybrid excimer-dye laser, 500 fs fwhm) and at 308 nm (XeCl excimer laser, 30 ns fwhm). The changes of intensity and position of the polymer Raman bands upon irradiation provide information on cleavage of the polymer bonds. Degradation of PMMA, which is a weak absorbing system at 248 nm, occurs to a higher extent in the case of a larger M(W), giving rise to the creation of unsaturation centers and to degradation products. For highly absorbing PS, no degradation is observed upon irradiation with a KrF laser. Consistently irradiating doped PS at 308 nm, where the absorption is low, induces degradation of the polymer. Results provide direct support for the bulk photothermal model, according to which ejection requires a critical number of broken bonds. In the case of irradiation of doped PMMA with pulses of 248 nm and 500 fs, neither degradation nor dependence with polymer M(W) are observed, indicating that mechanisms involved in the femtosecond laser ablation differ from those operating in the case of nanosecond laser ablation. Participation of multiphoton/avalanche processes is proposed.     

重氮偶合方法合成主链型光响应偶氮聚合物

提出了一种利用重氮偶合方法合成主链偶氮聚合物的新方法,合成了一种主链含有假芪型偶氮生色团的聚合物.对合成聚合物的结构、热性能以及光响应性能进行了详细表征.在线偏振激光的作用下,聚合物膜中的偶氮苯生色团发生光致取向,用偏振紫外-可见光光谱测量了此聚合物膜的二向色性,得到聚合物膜的取向有序度为0.03.用波长为488 nm,能量密度为150 mW/cm2的相干Ar+激光对聚合物膜照射1000 s,得到形貌规整的正弦波形表面起伏光栅,光栅的周期为900 nm,起伏深度为89 nm.     

一种新的配位聚合物[Cd(SCN)2(POM)2]n的合成和晶体结构(英)

The one-dimensional chain self-assembled coordination polymer, [Cd(SCN)₂(POM)₂]_n(where POM is 3-methyl-4-nitropyridine-N-oxide), was synthesized and characterized. The crystal data for the title coordination polymer: monoclinic, space group P2₁/c, a = 1.182 3(1) nm, b = 0.591 1(1) nm, c = 1.419 2(1) nm, β = 102.875(1)°, Z=2, μ = 1.391 mm^-1, final R₁ = 0.062 8, wR₂ = 0.145 2. The coordination polymer exhibits a strong fluorescent emission band at ca. 518 nm. CCDC: 211506.