双核中性镍的合成及其催化乙烯聚合

经希夫碱缩合反应,制得水杨醛亚胺配体(3),其Na盐与trans-NiClPh(PPh3)2合成了新型中性镍配合物4{[o-(3-Cyclopentenyl)-(5-Me)C6H2--oC(H)=N-2,6-(i-Pr)2C6H2]2CH2}[Ni(Ph3P)(Ph)]2.经Ni(COD)2活化,配合物4的最高活性达12.12×105gPE/(molNi.h),所得聚合物黏均相对分子质量在1.93×104~9.49×104之间.研究了不同聚合条件对催化性能的影响.配合物4可以作为单组分催化剂催化乙烯聚合,活性高达1.49×105gPE/(molNi.h),所得聚乙稀相对分子质量及其分布分别达到了5.27×104和3.34.     

新型双核苊-二亚胺镍催化剂合成及催化乙烯聚合的研究

将苊醌和4,4′-亚甲基-二(2,6-二异丙基苯胺)通过席夫碱缩合反应,采用硅胶柱分离得到双核苊-二亚胺配体[H2NC6H2-3,′5-′d i-R-CH2-3,5-d i-R-C6H2-N=C(Nap)-(Nap)C=N-3,5-d i-R-C6H2-CH2-3,′5-′d i-R-C6H2-N=C(Nap)-(Nap)C=N-3,5-d i-R-C6H2-CH2-3,′5-′d i-R-C6H2NH2],Nap为1,8-naphthd iyl;R:CH(CH3)2}(L)。在N2保护下,L与(DME)N iB r2反应,制备了一种新型双核苊二亚胺镍配合物N i2LB r4。通过1H NMR,13C NMR,EA等对配体及配合物进行了表征。研究了该催化剂以通用烷基铝,而不用昂贵的MAO为助催化剂的催化体系对乙烯聚合的催化性能,结果发现其对乙烯的聚合具有很高的活性,最高可达1.76×106g.mol-1.h-1,聚合条件如:温度、助催化剂的种类、n(A l)/n(N i)等对聚合反应及产物的结构有较大影响。     

三啮镍配合物的合成、结构及催化降冰片烯活性研究

合成含2-氨基苯基二苯基膦水杨醛配体(三啮(P) (N)O 配体)的3个后过渡金属镍配合物催化剂;采用元素分析、红外光谱和单晶衍射实验等方法对配合物的结构进行表征;研究了配合物对降冰片烯聚合的催化活性和影响因素.实验表明,在以甲基铝氧烷(MAO)为助催化剂时,配合物对降冰片烯聚合显示出良好的催化活性;聚合产物呈现良好的...     

新型Ni(acac)_2/TiCl_4/L配体复合催化剂催化乙烯聚合制备支化聚乙烯的研究

制备了以MgCl2 -SiO2 为载体 ,以α_二亚胺配体L修饰的Ni (acac) 2 TiCl4复合催化剂 ,以R2 AlCl和R3Al为助催化剂 ,研究了催化剂的组成配比以及各种聚合条件对乙烯聚合反应的影响及其表观聚合动力学 ,并用IR、1 3 CNMR对聚合产物进行了结构分析和支化度的测定。结果表明 ,Ni (acac) 2 TiCl4 L配体复合催化剂有良好的齐聚和原位共聚性能 ,催化单一乙烯聚合获得了支化聚乙烯 ,其中配体L2 制得支化度为 4～ 12支链数 10 0 0C的支化聚乙烯。     

新型Ni(acac)2/TiCl4/L配体复合催化剂催化乙烯聚合制备支化聚乙烯的研究

制备了以MgCl2—SiO2为载体，以α—二亚胺配体L修饰的Ni(acac)2／TiCl4复合催化剂，以R2A1C1和R3A1为助催化剂，研究了催化剂的组成配比以及各种聚合条件对乙烯聚合反应的影响及其表观聚合动力学，并用IR、^13C NMR对聚合产物进行了结构分析和化度的测定。结果表明，Ni(acac)2／TiCl4/L配体复合催化剂有良好的齐聚和原位共聚性能，催化单-乙烯聚合获得了化聚乙烯，其中配体L2制得支化度为4—12支链数／1000C的化聚乙烯。     

取代茚基二价稀土配合物催化甲基丙烯酸甲酯的聚合

较系统地研究了取代茚基二价稀土配合物(1—C5H9C9H6)2Sm(THF)作为单组分催化剂，催化MMA的聚合反应。结果表明，催化剂在较宽的温度范围显示出较高的催化活性，在以甲苯为溶剂的催化体系中加入少量的极性溶剂THF，聚合活性有显著的提高，温度降低MMA的转化率增加，所得PMMA的分子量升高，分子量分布变窄，几种取代茚基二价稀土配合物都显示了较高的催化活性，其活性次序为：(1—PhCH2C9H6)2Sm(THF)2＜(1—C5H9C9H6)2Yb(THF)2＜(1—C5H9C9H6)2Sm(THF)＜(1—C2H5C9H6)2Sm(THF)2。中性取代茚基二价稀土配合物所得聚合物主要为间同立构的PMMA，而由离子型的二价稀土配合物KSm(1—C5H9C9H6)3(THF)3所得到的为无规立构PMMA。     

1，1，1-三[4’-（2-氨基-6-甲基吡啶）甲酰基-2’-氧杂丁基]丙烷及其稀土苦味酸盐配合物的合成与表征

由于稀土配合物在催化剂^[1]、电化学[2]、荧光探针[3]以及生物活性[4～5]等方面具有潜在的应用，因此近十余年来对该类配合物的研究一直是配位化学研究领域的一个重要部分．三脚架配体对金属离子来说是一种很好的主体分子，但到目前为止，有关三脚架配体与稀土离子的配位形式及性质的研究却很少^[6]，为此，我们合成了三脚架配体1，1，1-三[4’-(2-氨基-6-甲基吡啶)甲酰基-2’-氧杂丁基]丙烷(L)及其稀土苦味酸盐的配合物，并对配体及配合物的谱学性质进行了表征．     

1,1,1-三[4′-(2-氨基-6-甲基吡啶)甲酰基-2′-氧杂丁基]丙烷及其稀土苦味酸盐配合物的合成与表征

由于稀土配合物在催化剂[1]、电化学[2]、荧光探针[3]以及生物活性[4～5]等方面具有潜在的应用,因此近十余年来对该类配合物的研究一直是配位化学研究领域的一个重要部分.三脚架配体对金属离子来说是一种很好的主体分子,但到目前为止,有关三脚架配体与稀土离子的配位形式及性质的研究却很少[6],为此,我们合成了三脚架配体1,1,1-三[4′-(2-氨基-6-甲基吡啶)甲酰基-2′-氧杂丁基]丙烷(L)及其稀土苦味酸盐的配合物,并对配体及配合物的谱学性质进行了表征.     

铕-丁二酸衍生物-2,2'-联吡啶三元配合物的合成和荧光性质研究

分别以丁二酸(L1)、2-甲基丁二酸(L2)、2-亚甲基丁二酸(L3)、2-巯基丁二酸(L4)、2-溴基丁二酸(L5)、2-羟基丁二酸(L6)为第一配体,2,2'-联吡啶(bipy)为第二配体,合成了6种稀土铕的三元配合物,通过差热分析及稀土络合滴定确定了配合物的组成为Eu2(L)3bipy.2H2O(L=丁二酸及其衍生物).通过红外光谱、荧光光谱表征了配合物的性质.对6种配合物进行荧光光谱研究,结果表明:配体取代基的变化对配合物荧光激发峰和发射峰的位置变化影响很小,但对配合物的荧光强度有较大影响,其配合物的荧光强度大小为:-SH>-Br>-H>-OH>-CH3>-CH2.     

金刚乙胺邻香草醛Schiff碱铟配合物的合成与表征

利用四水合三氯化铟与金刚乙胺缩邻香草醛Schiff碱(即配体L)进行反应,合成了新的配合物.用核磁共振、红外光谱、元素分析及热重分析等测试手段,对新的配合物进行了结构表征.结果表明,配合物的组成为InCl3L.C2H5OH,即每个配合物分子由1个三价In离子、1个配体L、3个氯离子,以及1个乙醇分子以类似结晶水的形式共同组成.配体中酚羟基上的H原子与N原子相吸形成了分子内氢键,并以氢键连接构成了一个新六元环.由配体形成配合物时,配体上原来成键模式完全保留了下来.配体分子内亚胺基中的氮未参与配位,而配体上酚羟基的氧及甲氧基的氧同时与中心原子In配位,形成双齿螯合配位构型.配合物中In原子为五配位的.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that