一种新的含有低价态钼磷酸盐{P4Mov6}建筑单元超分子化合物的溶剂热合成和晶体结构

通过水热合成法合成了一个新的夹心型钼磷酸基“三明治”状有机一无机杂化化合物[C3N2H5]2[C7NH10]2{MnFMo8O12（OH）°（PO4）（H2PO4）3]2}[C5NH5]4·2H2O（化合物1）,并对其进行元素分析、红外光谱、热重分析和X射线单晶衍射表征。单晶结构解析表明,该化合物属于正交晶系,Pbca空间群,晶胞参数a=1．69774（17）nm,b=2．0438（2）nm,c-2．5047（3）nm,a-90°,B=90°,y=90°,V=8．6908（15）nm3,Z=4。化合物1中的夹心结构阴离子是由2个{MnEM06O12（0H）3（PO4）（H2PO4）3]2}建筑单元通过1个八面体配位的金属Mn2＋离子键连形成。化合物[C3N2H5]2[C1NH10]2{MnEMo6O12（OH）3（PO4）（H2PO4）3]2}[GNH5]4·2H2O中,具有夹心结构的Mn（P4Mo6）2与质子化的咪唑、N-乙基吡啶、吡啶及水分子通过氢键连接形成超分子化合物。室温固态荧光光谱分析表明,该化合物在437nm处具有较强的荧光发射。化合物1的合成表明溶剂在多金属氧酸盐的合成中起到了重要的作用。     

夹心型多金属氧酸盐的电化学性质及其对亚硝酸根的电催化还原

系统研究了夹心型过渡金属取代Keggin结构的多金属氧酸盐K10 [M4(H2 O) 2 (XW9O34 ) 2 ]·2 0H2 O(M =Zn ,Co,Cu ;X =P ,As)在水中的电化学行为 .结果表明 ,此类化合物的电化学行为较单取代多金属氧酸盐复杂 ,在 pH =4的缓冲溶液中这些化合物均对亚硝酸根的电还原有很好的催化作用 .     

一种新的夹心型多酸配合物的合成、晶体结构和磁性研究

在常规条件下,合成出以缺位的Dawson阴离子和过渡金属钴构成的夹心型化合物Na5H5[αββα-(CoII(H2O)5)2(Co4II(H2O)2)(AsW15(OH)6O50)2]·38H2O。对该化合物进行了X射线单晶衍射分析、粉末X射线衍射分析(XRD)、元素分析及红外分析(IR)。X射线单晶衍射分析表明,四面体簇Co4O16夹在两个缺位的AsW15半球中,两个相邻的夹心型化合物通过两个Na离子连接,形成罕见的二维延展结构。磁学性质研究表明,在该化合物中存在两种磁性中心,使得化合物既具有铁磁性相互作用,又有反铁磁性相互作用。     

Keggin型钼氧酸盐化合物{PMo_7~ⅥMo_4~ⅤV~ⅤO_(40)(V~ⅣO)_2[Co(bipy)_2(H_2O)]_2}[Co(bipy)_3]_2{PMo_7~ⅥMo_4~ⅤV~ⅤO_(40)(V~ⅣO)_2}·6H_2O的合成、结构及性质表征

合成了一种新颖的修饰型的Keggin结构多金属氧酸盐超分子化合物,并用单晶衍射仪测定了其晶体结构,元素分析及红外光谱等进一步佐证了化合物的结构.配合物为三斜晶系,P-1空间群,晶胞参数为a=12.969 4(11),b=14.025 0(11),c=24.518 0(19),α=86.511 0(10)°,β=83.033 0(10)°,γ=62.777 0(10)°,V=3 936.4(5)3,Z=1.配合物是一种特殊的双帽双支撑型的多金属氧酸盐,它是由双帽假Keggin[PMo7ⅥMo5ⅤO40(VⅣO)2]4-单元,{Co(2,2′-bipy)2(H2O)}和[Co(bipy)3]2+部分组成.其中,两个金属有机阳离子{Co(2,2′-bipy)2(H2O)}和两个盖帽的钒原子上的末端氧原子通过共价连接在[PMo7ⅥMo4ⅤVⅤO40(VⅣO)2]上,并通过氢键作用形成三维层状结构.     

混合价六核锰簇合物的合成、表征与磁性研究

通过简单三核锰[Mn3O(O2CPh)6(py)2(H2O)]的聚合得到了化合物[Mn6(O)2(PhCO2)10(py)2(MeCN)(H2O)]·0.5CH3OH·1.5H2O.X射线单晶衍射表明,该化合物包含一个由2个{Mn4(μ4-O))四面体共边组成的[Mn6(μ4-O)2]10+金属中心,金属中心外围10个苯甲酸配体、2个吡啶配体,以及1个乙腈分子和1个水分子完成Mn离子的配位位置.结构分析表明,化合物1中Mn离子为混合价态(Mn4ⅡMn2Ⅲ).变温磁化率测定表明,锰离子之间主要存在反铁磁相互作用.     

含有XW_9O_(33)~(9-)(X=As~Ⅲ,Sb~Ⅲ,Bi~Ⅲ)杂多钨酸盐的研究进展

~~1.2　 {As W9O3 3 }2由过渡金属等连接两个 As W9O3 3 9-可形成夹层型结构聚阴离子 .图 2示出了 As2 W2 1O69( H2 O) 6-的结构 [11] ,夹层中的 3个 W可以被其他的过渡金属等离子或基团所取代 ,从而形成单取代、双取代和三取代夹心型化合物 ,如单取代化合物 [As2 MW2 0 O68( H2 O) 2 ]8-( M=Co2 + ,Zn2 + ) [12 ] ,双取代化合物 [( α-As W9O3 3 ) 2 WO ( H2 O) M2 ( H2 O) 2 ]10 -( M =Zn2 + ,Mn2 + ) [13 ] ,[( Hg2 ) 2 WO( H2 O) ( As2 W9O3 3 ) 2 ]10 -[14 ](图 3) ,[{( ph Sn ) 2 O2 }2 H (α- As W9O3 3 ) 2 ]9-…     

双钒帽多金属氧酸盐化合物[ZnⅡ（2,2′-bpy）（H2O）2]2[HPMoⅤ6MoⅥ6O40（VⅣO）2]·2EtOH的水热合成和晶体结构

通过过渡金属阳离子ZnⅡ和2,2′-bpy有机含N配体作为调变单元,水热合成了新型多金属氧酸盐化合物[ZnⅡ(2,2′-bpy)(H2O)2]2[HPMoⅤ6MoⅥ6O40(VⅣO)2].2EtOH.经单晶X-射线衍射分析该化合物是金属-有机片段通过钒氧帽和多金属氧酸盐骨架相连的多金属氧酸盐,化合物结晶于单斜晶系,P2(1)/n空间群.     

双钒帽多金属氧酸盐化合物[Zn＾（Ⅱ）（2,2′-bpy）（H2O）2]2[HPMo＾Ⅴ6Mo＾Ⅵ6O（40）（V＾ⅣO）2]·2EtOH的水热合成和晶体结构

通过过渡金属阳离子ZnⅡ和2,2′-bpy有机含N配体作为调变单元,水热合成了新型多金属氧酸盐化合物[ZnⅡ（2,2′-bpy）（H2O）2]2[HPMo^Ⅴ6Mo^Ⅵ6O40（V^ⅣO）2].2EtOH.经单晶X-射线衍射分析该化合物是金属-有机片段通过钒氧帽和多金属氧酸盐骨架相连的多金属氧酸盐,化合物结晶于单斜晶系,P2（1）/n空间群.     

[Co（1,10’-phen）3]2[SiW12O40]·2H2O的水热合成和晶体结构

利用过渡金属阳离子CoⅡ和1,10’-phen有机含N配体作为调变单元,水热合成了多金属氧酸盐化合物[Co(1,10’-phen)3]2[SiW12O40].2H2O.经单晶X-射线衍射分析,该化合物的多阴离子显示出一个无序的Keggin型几何构型,化合物结晶于三斜晶系,P-1空间群.     

基于不同夹心型多酸的两个超分子化合物的合成、结构及性能研究

利用两种柔性配体1,1'-(1,4-丁烷)双(咪唑)(bbi)和1,4-双(咪唑-1-亚甲基)苯(bix),我们在水热条件下获得了两个基于不同夹心型多金属氧酸盐的超分子化合物:(bix)5[H5As W9Co2(H_2O)O34]2·2H_2O(1)和(bbi)4[H5As W9Ni2(H_2O)O34]2·4H_2O(2),并对两个化合物进行了单晶X-射线衍射、元素分析和红外光谱表征.结构分析表明,化合物1属于单斜晶系,P21/n空间群,晶胞参数a=13.5665(9)A,b=17.6394(13)A,c=23.8019(17)A,β=102.326(7)°,V=5564.6(7)A3,Z=2,R1=0.0352,ωR2=0.0514.化合物2属于三斜晶系,P 1空间群,晶胞参数a=12.311(5)A,b=13.661(5)A,c=16.971(5)A,α=103.608(5)°,β=104.189(5)°,γ=111.906(5)°,V=2392.0(15)A3,Z=1,R1=0.0601,R2=0.1734.目标化合物中两种不同的夹心型多酸阴离子和配体bbi、bix通过丰富的氢键作用形成超分子框架结构.     

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