基于多氮杂环配体的锌(Ⅱ)和镉(Ⅱ)配合物的水热合成与晶体结构

以多氮杂环配体二吡啶[3,2-a:2',3'-c]并吩嗪(DPPZ)和[2,3-f]吡嗪并[1,10]菲罗啉(Pyphen)为配体,采用水热法合成了两个配合物[Zn(DPPZ)2SO4]·2H2O(1)和[Cd(Pyphen)2Cl2](2),利用元素分析和单晶X-射线衍射对其结构进行了表征.分析结果表明,配合物(1)和(2)都属于单斜晶系,空间群都为C2/c.配合物1的晶胞参数为:a=17.500 7(9),b=7.234 4(5),c=23.182 2(14),β=94.942(5)°,V=2 924.1(3)3,Z=4;配合物(2)的晶胞参数为:a=8.509 8(17),b=12.524(3),c=22.683(5),β=95.31(3)°,V=2 407.0(8)3,Z=4.配合物(1)和(2)均为零维结构单元,配合物(1)的单元之间通过π-π堆积作用形成二维层状结构,层与层之间通过氢键作用形成三维超分子结构.配合物(2)的配位单元之间通过Pyphen配体的π-π堆积作用构筑成一个二维超分子结构.     

三维超分子配合物[Cu（phen）（S04）]的水热合成、晶体结构及荧光性质

以1,10-邻菲罗啉（phen）为配体,利用水热法合成了一种新的三维超分子配合物[Cu（phen）（sO4）],并利用单晶x-射线衍射法对晶体结构进行了测定．结果表明,该配合物属单斜晶系,C2／c空间群,晶胞参数为：a=14．8936（10）A,b=13．8468（9）A,c=7．0223（5）A,β=108．5340（10）,y=1373．09（16）A3,Z=4,R1=0．02942,wR2=0．0833．晶体解析表明化合物中的铜离子与phen配体的两个螯合氮原子配位,并在硫酸根的桥连作用下形成一维链状结构,相邻链间通过π-π堆积和氢键作用形成三维超分子网络,并对配合物的荧光性能进行了研究．     

新型4-羧酸-2,2′:6′,2″-联三吡啶配合物的合成、晶体结构与荧光性质

用乙酸锌、4-羧酸-2,2′:6′,2″-联三吡啶和草酸在水热法条件下反应生成新的配合物1,结构式为[Zn_3(tpy)_2(C_2O_4)_2(H_2O)_4]·(H_2O)(tpy=4-羧酸-2,2′:6′,2″-联三吡啶).X-射线单晶衍射测定配合物1,该单晶属于单斜晶系,2/m点群,P2_1/c空间群,晶胞参数为:a=8.8197(13),b=23.462(3),c=10.0674(14),α=90°,β=113.49°,γ=90°.配合物1是三核配合物.中心锌离子Zn1是六配位,其中3个Zn1-N键长分别是2.186(4)、2.083(3)、2.172(5),3个Zn1-O键长分别是2.230(3)、2.027(3)、2.048(4).锌离子Zn2是对称六配位,键长分别是2.1223(3)、2.0597(5)、2.1416(4).配合物1分子通过氢键和π-π堆积作用形成三维超分子结构.对配合物1进行荧光及热稳定性的研究表明,配合物1具有很好的稳定性,并具有一定的荧光性.     

一个二维超分子化合物[Co(bbbm)(dnba)_2]的合成、结构及性质

以1,4-二苯并咪唑基-丁烷(bbbm)和3,5-二硝基苯甲酸(Hdnba)为混合配体,利用水热合成方法获得了一个环状双金属Co(II)配合物:[Co(bbbm)(dnba)2],并通过元素分析、IR和单晶X-射线衍射确定了其结构.该配合物分子式为C32H24Co N8O12,三斜晶系,P1空间群,a=10.859(5),b=12.325(5),c=13.119(5),α=100.638(5)°,β=108.858(5)°,γ=92.309(5)°,Z=2,V=1623.5(12)3,Mr=771.52,Dc=1.578 g/cm3,F(000)=790,μ=0.609 mm-1,S=1.062,R=0.0423,wR=0.0967.晶体结构分析表明,配合物中的CoII与来自两个bbbm配体的两个N原子、两个dnba阴离子的单齿羧基O原子配位形成四面体配位构型.相邻的两个CoII通过两个bbbm配体连接成环状结构,相邻的双金属Co(II)配合物通过π-π堆积作用拓展成一维超分子链,该超分子链进一步通过C-H…π作用拓展成二维超分子网络.另外,还研究了该化合物的电化学和荧光性质.CCDC:1025167.     

超分子配合物[Cu(phen)_2Cl]NO_3·3H_2O与[Cu(bipy)(H_2O)_2SO_4]_n的合成和晶体结构

在水热条件下合成了2例铜(Ⅱ)的配合物[Cu(phen)2Cl]NO3·3H2O(1)和[Cu(bipy)(H2O)2SO4]n(2)(phen=1,10-邻菲罗啉,bipy=2,2′-联吡啶).通过元素分析、红外光谱对配合物进行表征,并利用单晶X射线衍射法测定其结构.配合物1和2都属于单斜晶系,C2/c空间群.其中配合物1是单核小分子结构,Cu(Ⅱ)离子具有变形四方锥的配位环境,分别与2个邻菲罗啉配体上的4个氮原子和1个氯离子配位,离散的小分子通过π…π堆积作用形成平行于bc平面的2D层状结构,进一步通过氢键作用形成三维超分子结构.配合物2是一维无限链结构,Cu(Ⅱ)离子具有扭曲八面体配位环境,分别与2个联吡啶氮原子、2个水分子氧原子和2个SO2-4氧原子配位,SO2-4桥连相邻的Cu(Ⅱ)离子形成1D链结构,通过分子间氢键作用形成独特的双链结构,由于双链两侧的bipy分子之间的π…π堆积作用,形成平行于bc平面的2D超分子结构.此外研究了2例配合物的热稳定性.     

三维超分子化合物[Cu(tzda)(phen)(H2O)]n的合成、结构及电化学性质

合成了三维超分子化合物[Cu(tzda) (phen)(H2O)]n(H2tzda为1,3,4-噻二唑-2,5-二硫代乙酸,phen为邻菲咯啉),测定了其晶体结构.结果表明:配合物属单斜晶系,空间群P21/c.配合物中,与金属中心Cu(Ⅱ)离子配位的3个氧原子分别来自2个tzda2-配体酸根和1个水分子,2个氮原子则来自同一个1,10-邻菲咯啉分子,形成五配位的变形四角锥结构.由于tzda2-的桥联作用以及氢键和π-π弱堆积作用,配合物堆积成三维超分子网状结构.对配合物的电化学研究表明:在-0.6 V～ +0.4 V电位范围内,Cu2+/Cu+电对在电极上的氧化还原反应过程是准可逆过程且受扩散控制.     

环状双核钴配合物的合成、晶体结构及其性质

在水热反应条件下合成了一个新型Co(Ⅱ)配合物[Co2(cpa)2(phen)2(H2O)2](1)(cpa =3-(4-羧基苯基)丙酸、phen=1,10-邻菲罗啉).采用CHN元素分析、红外光谱、差热-热重及单晶X-射线衍射等方法对配合物的晶体结构进行了表征.配合物属于单斜晶系,空间群为P2(1)/c;晶体学参数:a=1.26192(14) nm, b=1.59916(17) nm, c=1.04130(11) nm,β=111.935(2)°.配合物1为环状双核结构,其基本结构单元由1个Co原子、1个3-(4-羧基苯基)丙酸、1个1,10-邻菲罗啉和1个配位水分子组成,形成畸变的八面体配位构型.相邻的配合物分子间通过氢键的识别作用形成1维超分子链.π···π堆积作用将邻近的超分子链进一步扩展为2维超分子网.     

芳香羧酸构筑的Pb(Ⅱ)配合物的合成及晶体结构

以1,3-苯二甲酸(1,3-H2BDC)或1,3-苯氧基二乙酸(1,3-H2BDOA)为配体,利用水热法合成出两种结构不同的Pb(Ⅱ)配合物[Pb4(1,3-BDC)3O(H2O)]n·n H2O(1)和[Pb(1,3-BDOA)]n(2),并通过元素分析及X-射线单晶衍射对其结构进行了表征.结构分析表明:配合物1和2都属于单斜晶系,空间群都为P21/c.配合物1的晶胞参数为:a=15.350 5(19),b=13.574 3(17),c=14.057 6(17),β=112.776(2)°,V=2 700.8(6)3,Z=4;配合物2的晶胞参数为:a=8.774 8(18),b=5.728 4(11),c=20.647(4),β=96.46(3)°,V=1 031.2(4)3,Z=4.在配合物1中,[Pb4(1,3-BDC)3O(H2O)]的四核簇状结构通过1,3-BDC以及μ—O原子连接成三维无限网络结构.对于配合物2,1,3-BDOA配体连接Pb(Ⅱ)离子形成二维层状结构.     

L-丝氨酸水杨醛希夫碱镍(Ⅱ)配合物的合成、结构及与DNA的相互作用

合成了L-丝氨酸水杨醛希夫碱及邻菲咯啉混配体镍(Ⅱ)配合物,[Ni(ser-sal)(phen)(CH3OH)](ser-sal为L-丝氨酸与水杨醛形成的希夫碱,phen为1,10-邻菲咯啉),利用元素分析和红外光谱进行了表征.X-射线单晶衍射测定表明,配合物属于单斜晶系,C2/c空间群,晶胞参数为a=26.040(2),b=15.110 1(13),c=11.592 0(9),α=90°,β=107.128(2)°,γ=90°,V=4 358.8(6)3,Z=8,F(000)=1 984,R1=0.078 5,wR2=0.204 0.在晶体中配合物以分子间氢键作用形成二维网状结构.利用紫外可见吸收光谱、荧光光谱和圆二色光谱法研究了该配合物与小牛胸腺DNA(CT-DNA)的相互作用.结果表明,该配合物与DNA作用方式为插入模式,与DNA的结合常数Kb为7.8×104 L·mol-1,荧光猝灭常数为Ksq为0.91(CCDC∶1442728).     

新型超分子配合物[Cu(Hhbd)(phen)2]·1.5H2O·2CH3OH的合成、晶体结构与表征

利用螯合配体1,10-邻菲咯啉(phen)与羟基丁二酸(H3hbd)及铜盐反应合成了一种新型超分子配合物[Cu(Hhbd)(phen)2].1.5H2O.2CH3OH,通过单晶衍射测定了晶体结构,并用元素分析、红外光谱、热分析等技术对其进行了表征。配合物属三斜晶系,空间群P-1;晶胞参数:a=1.20624(17)nm,b=1.6598(2)nm,c=1.6863(3)nm,α=117.23(9),°β=71.262(3),°γ=117.23(9);°Z=4;最终偏离因子R=0.0420。配合物中每个Cu(Ⅱ)原子与来自两个phen的4个N原子和羟基丁二酸根(Hhbd)的1个O原子配位,形成畸变的三角双锥结构单元。紧邻的单核单元通过phen分子间的π-π堆积作用及Hhbd的羧基O和羟基O与phen环上C原子间的C-H…O氢键的协同作用形成一维zigzag超分子链,毗邻的超分子链籍两种不同氢键相互作用的连接构筑了二维超分子体系。     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the