HfReSi2的合成,晶体结构及成键特性

电弧熔炼方法合成了ＨｆＲｅＳｉ２,单晶Ｘ射线衍射方法测定了晶体结构．晶体学及结构修正参数：化学式,ＨｆＲｅＳｉ２,Ｍｒ＝４２０．８７,正交晶系,ＴｉＭｎＳｉ２类型,（５５）Ｐｂａｍ,ａ＝０．９１４０（１）ｎｍ,ｂ＝１．００５１（２）ｎｍ,ｃ＝０．８０８１（１）ｎｍ,Ｖ＝０．７４２４（３）ｎｍ３,Ｚ＝１２,Ｄｘ＝１１．２９７ｇ／ｃｍ３,μ＝９９．２５ｍｍ－１（λＭｏＫα＝０．０７１０７ｎｍ）,Ｆ（０００）＝２１００,Ｔ＝２９６Ｋ,对于３１个修正参数和２５５个独立可观察衍射点ｗＲ＝０．０６９．此结构中,Ｒｅ原子处于Ｓｉ原子所形成的配位畸变八面体中心,这些ＲｅＳｉ６通过共面和共棱形成之字形无限柱,柱之间通过共顶和Ｓｉ原子的共价成键桥联形成三维网络结构．从此结构和其它相同１∶１∶２配比硅化合物结构的比较可以得出结论,低族过渡金属Ｍｎ、Ｒｅ等倾向于硅的八面体配位,而高族过渡金属Ｆｅ、Ｃｏ、Ｎｉ等则倾向于硅的四方锥体配位     

HfReSi的合成,晶体结构及成键特性

电弧熔炼方法合成了ＨｆＲｅＳｉ，单晶Ｘ射线衍射方法测定了晶体结构．晶体学及结构修正参数：化学式ＨｆＲｅＳｉ，Ｍｒ＝３９４．８９，六方晶系，ＺｒＡｌＮｉ类型，（１８９）Ｐ－６２ｍ，ａ＝０．６９３４３（７）ｎｍ，ｃ＝０．３３９５０（６）ｎｍ，Ｖ＝０．１４１３７（３）ｎｍ３，Ｚ＝３，Ｄｘ＝１４．０２４ｇ／ｃｍ３，μ＝９４．２９ｍｍ－１（λＭｏＫα＝０．０７１０７ｎｍ），Ｆ（０００）＝４８５，Ｔ＝２９６Ｋ，对于９个修正参数和３５８个独立可观察衍射点Ｒ＝０．０６４，ｗＲ＝０．０６３．此结构中，Ｒｅ－Ｓｉ形成紧密结合的准一维三方棱柱，柱之间通过Ｓｉ原子的过渡成键桥联形成柱的密堆积．原子尺寸效应是我们理解此结构和其它Ｆｅ２Ｐ多元替代结构的形成的关键．     

四元有序替代化合物Y（Rh,Ni）Ni4Si3的合成,结构及成键特性

电弧熔炼方法合成了Ｙ（Ｒｈ,Ｎｉ）Ｎｉ４Ｓｉ３,单晶Ｘ射线衍射方法测定了晶体结构．晶体学及结构修正参数：化学式Ｙ（Ｒｈ．４２Ｎｉ．５８）Ｎｉ４Ｓｉ３,Ｍｒ＝６０５．２３,正交晶系,ＹＮｉ５Ｓｉ３替代类型,（６２）Ｐｎ－ｍａ,ａ＝１．８７９７（７）ｎｍ,ｂ＝０．３７８６０（３）ｎｍ,ｃ＝０．６８０４９（９）ｎｍ,Ｖ＝０．４８４２７（７）ｎｍ３,Ｚ＝４,Ｄｘ＝６．６５３ｇ／ｃｍ３,μ＝３１．４３７ｍｍ－１（λＭｏＫα＝０．０７１０７ｎｍ）,Ｆ（０００）＝９１２,Ｔ＝２９６Ｋ,对于３０个最小二乘修正参数和２３９个独立可观察衍射点ｗＲ＝０．０５２．Ｎｉ原子处于Ｓｉ的四面体配位中心且近邻原子数为１２,而Ｒｈ则处于Ｓｉ的四方锥中心且近邻原子数为１４个,符合金属间化物中原子的配位数规律,也说明在此化合物结构中几何堆积因素占了很重要地位．     

(Bu_4N)_2Mo(mnt)_3的晶体结构

（Ｂｕ４Ｎ）２ＭＯ（ｍｎｔ）３系针状墨绿色晶体，晶胞参数，ａ＝１０．２０８（６）Ａ；ｂ＝１５．８４１（５）Ａ；ｃ＝１８．００３（３）Ａ；α＝８６．６７（２）°；β＝８４．２０（４）°γ＝１０７．７４（４）°，空间群Ｃ＇ｉ－ＰＴ；Ｚ＝２；ρｏｂｓ＝１、２１８，ρｃαｌｃ＝１．２１０克／厘米３．在四园衍射仅上收录 Ⅰ≥１σ（Ⅰ）独立衍射点３０３５个，晶体结构由三维Ｐａｔｔｅｒｓｏｎ函致和电子密度函数解出，经全矩阵最小二乘法精修，偏离因子Ｒ＝０．０８７．结构分析结果表明，晶体结构由Ｍｏ［Ｓ２Ｃ２（ＣＮ２］２－３和［Ｎ（Ｃ４Ｈ９）］４＋构成。阴离子Ｍｏ［Ｓ２Ｃ２（ＣＮ）２］２－３是由三个配位体［Ｓ２Ｃ２（ＣＮ）２］２－中的二个Ｓ原子与Ｍｏ原子螯合，基本上成三棱柱方式配位．     

SmAlGe结构中的Al—Ge共价成键网络

用电弧熔炼法合成ＳｍＡｌＧｅ，以单晶Ｘ射线衍射法测定晶体结构．晶体学及结构修正参数：化学式ＳｍＡｌＧｅ，Ｍｒ＝２５０．０，正交晶系，ＬａＰｔＳｉ类型，（１０９）Ｉ４１ｍｄ，ａ＝０．４１９５７（３）ｎｍ，ｃ＝１．４５８８（２）ｎｍ，Ｖ＝０．２５６７９（４）ｎｍ３，Ｚ＝４，Ｄｘ＝６．４６４ｇ／ｃｍ３，μ＝３５．２７ｍｍ－１（λＭｏＫ＝０．０７１０７ｎｍ），Ｆ（０００）＝４２８，Ｔ＝２９６Ｋ，对于１２个最小二乘修正参数和１２０个独立可观察衍射点Ｒ＝０．０３０，ｗＲ＝０．０２５．此化合物中主要是Ａｌ－Ｇｅ的共价结合并形成三维网络，经典极限情况下结构式可写成Ｓｍ３＋Ａｌ２－Ｇｅ１－，可称为“ｍｅｔａｌｉｃＺｉｎｔｌｐｈａｓｅ＂．而ＹＡｌＧｅ中Ａｌ－Ｇｅ准二维网络为共价到金属结合过渡，几何堆积因素占了很重要地位．     

CdI2与TSC加成物的合成及结构

ＣｄＩ２与ＴＳＣ在丙酮溶剂及水中形成加成物ＣｄＩ２（Ｃ４Ｈ１０Ｎ３Ｓ）２·Ｈ２Ｏ,晶体属单斜晶系,空间群为Ｐ２１／ｍ．晶胞参数为ａ＝０．７５３３（３）ｎｍ,ｂ＝１．５３５（２）ｎｍ,ｃ＝０．８４３７（２）ｎｍ,β＝９０．９１（３）°,ｖ＝０．９７６（１）ｎｍ３,Ｍｒ＝６４８．６４,Ｚ＝２,Ｄｃ＝２．２０ｇ·ｃｍ－３,μ（ＣｕＫα）＝４４．５８ｃｍ－１,Ｆ（０００）＝６０８,Ｔ＝２９７Ｋ．用１６２２个Ｉ≥３σ（Ｉ）独立衍射精修结构,最终偏差因子Ｒ＝０．０５７,晶体中存在分离的单核络合物ＣｄＩ２（Ｃ４Ｈ１０Ｎ３Ｓ）２·Ｈ２Ｏ,Ｃｄ原子呈畸变四面体配位．两个Ｃｄ－Ｉ和Ｃｄ－Ｓ键长分别为０．２７３０ｎｍ,０．２７４３ｎｍ和０．２５７５ｎｍ．     

K_(0.5)(NH_4)_(5.5)[MnMo_9O_(32)]6H_2O的合成及其晶体结构

由ＫＭｎＯ４和（ＮＨ４）６Ｍｏ７Ｏ２４４Ｈ２Ｏ合成了标题化合物Ｋ０．５（ＮＨ４）５．５［ＭｎＭｏ９Ｏ３２］６Ｈ２Ｏ，用ｘ－射线测定了晶体结构．该化合物的晶体属三方晶系，空间群Ｒ３２；ａ＝１５．８４６（４），Ｃ＝１２．３９６（３），Ｍｒ＝１６５７．２８，Ｖ＝２６９５．６３，Ｚ＝３，Ｄｃ＝３．８２ｇ／ｃｍ３，μ＝４１．５ｃｍ－１，Ｆ（０００）＝２９６７．对３０２４个可观测衍射［Ｆ０≥３σ（Ｆ０）］最终偏离因子Ｒ＝０．０３７，Ｒｗ＝０．０４３．结构测定表明：Ｍｎ（Ⅳ）与６个氧配位形成键长相同的ＭｎＯ６八面体，它位于［ＭｎＭｏ９Ｏ３２］６－阴离子的中心，而Ｍｏ（Ⅵ）均与氧原子六配位，形成９个畸变的ＭｏＯ６八面体．     

POM: TNP混合晶体的结构

３－甲基－４－硝基吡啶－１－氧（ＰＯＭ）与２，４，６－三硝基苯酚（ＴＮＰ）的混合晶体从三氯甲烷溶液中生长获得，组成为１∶１，熔点８５℃．采用Ｘ射线衍射法测定ＰＯＭ∶ＴＮＰ混合晶体结构，属单斜晶系，空间群：ｐｎ，ａ＝０．６２４６（４）ｎｍ，ｂ＝１．６０５８（６）ｎｍ，ｃ＝１．５２２８（３）ｎｍ，β＝９５．６２（３）°，Ｖ＝１．５２０（２）ｎｍ３，Ｚ＝４，Ｄｃ＝１．６７ｇ／ｃｍ３，λ（ＭｏＫα）＝０．０７１０６９ｎｍ，μ＝１．４０ｃｍ－１，Ｆ（０００）＝７８４，Ｒ＝０．０５９．结果表明，该晶体中两个不同分子之间存在一个氢键     

二乙胺合三（5—甲基—2—苯并噻唑基）硼烷的晶体结构

标题化合物二乙胺合三（５－甲基－２－苯并噻唑基）硼烷（Ｃ２８Ｈ２９ＢＮ４Ｓ３（Ｍｒ＝５２７．５７）的晶体属于三斜晶系,空间群为Ｐ１,晶胞参数ａ＝０．３９７（８）ｎｍ,ｂ＝１．１７４２（６）ｎｍ,ｃ＝１．３１００（２）ｎｍ,α＝１０４．２９（２）°,β＝９２．９９（３）°,γ＝９８．５８（５）°,Ｖ＝１．３７９０ｎｍ＾３,Ｚ＝２,Ｄｃ＝１．２７０ｇ／ｃｍ＾３,μ（ＭｏＫｎ）＝２．８０４ｃｍ＾－１。结     

对甲苯基双(4,4-二甲基-6-羟基环己烯-1-酮-2基)甲烷的合成

对甲苯基双（４,４－二甲基－６－羟基环己烯－１－酮－２基）甲烷由对甲苯甲醛与５,５－二甲基－１,３－环己二酮在Ｎ,Ｎ－二甲基甲酰胺中反应而得．通过单晶Ｘ射线衍射法确定其晶体属于单斜晶系,空间群Ｐ２１／ａ,ａ＝０．９３０４（２）ｎｍ,ｂ＝１．１７５４（２）ｎｍ,ｃ＝２．０１３４（４）ｎｍ,β＝１０２．４０（２）°,Ｍｒ＝３８２．５０,Ｖ＝２．１５０５（７）ｎｍ３,Ｄｃ＝１．１８１ｇ／ｃｍ３,Ｚ＝４,μ（ＭｏＫα）＝０．７９ｃｍ－１,Ｆ（０００）＝８５６．晶体结构用直接法解出,使用全矩阵最小二乘法对原子参数进行修正,最后的偏离因子为Ｒ＝０．０４２,ＲＷ＝０．０４５．在晶体结构中,存在两个共轭的烯醇式结构．     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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