共查询到20条相似文献,搜索用时 62 毫秒
1.
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. 相似文献
2.
在配体存在下,通过金属铜粉和过氧化苯甲酰的氧化加成反应合成了双核铜配合物[Cu(C6H5COO)2(C5H6N2)]2·,以元素分析、电导、热重-差热分析、红外光谱、磁性及粉末衍射对配合物进行了表征,并经X-射线单晶结构分析,确定了配合物的结构,晶体属于三斜晶系,空间群为P—1,分子式为C46H48N4O10Cu2,Mr=943.93,a=10.806(1)kb=11.169(3),C=11.729(2)A,α=71.99(2),β=89.38(1),γ=81.37(1)°,V=1330.1A3,Dc=1.172g/cm3,R=0.04329,Rw=0.04860,F(000)=490,μ=8.5cm-1,Z=1,两个铜原子的配位环境相同,由羧酸根的四个氧原子和2-氨基吡啶的氮原子形成五配位的四方锥多面体。 相似文献
3.
孔繁荣 《首都师范大学学报(自然科学版)》1999,20(1):45-51
合成了配合物[Tb(C18H20N2O4)(NO3)3],配体为2羟基3甲氧基苯甲醛与乙二胺缩合而成的双希夫碱.配合物晶体为单斜晶系,空间群P21/n,a=14186(3)nm,b=11848(2)nm,c=14626(3)nm,β=10435(3)°,V=2382(1)nm3,Dx=1872g/cm3,Z=4,μ=30755mm-1,F(000)=1320,R=0047,Rw=0056.Tb(Ⅲ)的配位数为10,配位几何构型为双帽四方反棱柱.所有配位原子都是氧原子.对该配合物进行了差热热重分析. 相似文献
4.
合成标题化合物[(seda)Cu]·EtOH,并得到单晶[seda=N,N′-二水杨叉基-1,2-二-(4-甲氧基苯基)乙二胺].X-衍射结构分析表明,晶体属正交晶系,空间群Pbca,晶体学数据:a=2.0115(4)nm,b=1.3196(3)nm,c=2.1057(4)nm,晶胞体积V=5.589(3)nm3,分子量588.16,Z=8,Dx=1.398g/cm3,μ=8.239cm-1,F(000)=2465,最终偏离因子R=0.079,Rw=0.083,(Δ/σ)max=0.68.结构分析表明,配体中二个偶氮甲碱中氮原子和二个酚氧原子与中心Cu原子配位,形成规则的菱形平面结构. 相似文献
5.
多聚配合物[Cd(β-ala)Cl2]用CdCl2与β-丙氨酸(β-ala,H3N+CH2CH2CO2-)在水溶液反应制得,并用单晶结构分析法测定其结构.该配合物的化学式为C3H7CdCl2NO2,属正交晶系,空间群为Pnma(No.62),a=694.4(1),b=796.3(2),c=1293.1(3)pm,V=0.7150(6)nm3,Z=4,Mr=272.40,Dc=2.530Mg/m3,用834独立衍射数据对结构进行精化,最后残差因子R1=0.0421.结果表明,每个镉离子与4个Cl和2个β-ala的羧基氧原子配位,呈变形八面体结构.每对镉离子由2个Cl和1个双齿羧基桥连,形成一维链状聚合结构 相似文献
6.
室温下,金属铜粉和2-噻吩甲酰三氟丙酮在甲醇溶剂中反应生成铜配合物[Cu(C8H4O2SF3)2]通过元素分析,红外光谱、热重、X-射线粉末衍射对其进行表征,并经X-射线单晶测试该配合物为单斜晶体,空间群为P21/C,晶胞参数a=10.582(1),b=11.169(2),c=8.044(3);β=104.61(2)°;V=916.73;z=2;Dc=1.833g·cm-3;R=0.082,Rw=0.092。铜原子与四个氧原子配位,形成四方平面 相似文献
7.
用ESR(ElectronSpinResonance)波谱研究(C2H5)4NB10H10Cu和(CH3)4NB12H12Cu的结构和化学键.结果表明该系列化合物中11B和14N核与Cu2+之间不是以共价键或者离子键形式直接连接,很可能存在着CuHB桥键,但Cu2+和1H之间的作用比较弱.(CH3)4NB12H12Cu中Cu2+位于B12H122-轴对称性配位场中,因而有较高的对称性和稳定性;(C2H5)4NB10H10Cu中Cu2+位于B10H102-非轴对称性配位场,并且Cu2+彼此之间相距较近 相似文献
8.
合成了含有Cl-桥联配体的两个新的双核配合物:Cu2(ampy)2Cl4·1/2C2H5OH(ampy=α-氨基吡啶)和Cu2[N,N’bis(ampy)-bzac(H2O)]Cl4·C2H5OH(bzac=苯甲酰丙酮).通过元素分析、IR、ESR和室温磁化率表征,测定了这两个配合物的变温磁化率(4~300K),其数值用最小二乘法与从自旋Hamiltonian算符导出的磁化率理论曲线拟合很好;求得了交换积分,对于配合物Cu2(ampy)2Cl4·1/2C2H5OH,J=-4.76Cm-2;对于Cu2[N,N’bis(ampy)-bzac(H2O)]Cl4·C2H5OH,J=-4.72cm-2,表明两个配合物中Cu(Ⅱ)-Cu(Ⅱ)核间有反铁磁相互作用. 相似文献
9.
AgNO_3和a-ph_2ppy,(a-(C_6H_5)_2P(NC_5H_5))在加有少量H_2O_2和NaOH的C_2H_5OH水溶液中反应生成标题化合物的灰黑色晶体。属四方晶系,空间群P4_1,a=1.300nm,C=4.076nm,v=6.884nm ̄3,Z=8,D_c=1.67gcm ̄(-3),R=0.059,r_ω=0.072.每一不对称单元中存在二套独立而结构基本相同的[Ag_2(a-ph_2PPy)_2] ̄2+,它的二个Ag原子和二个a-ph_2PPy中-N-C-P-桥的N,P原子联接成为一个稳定非共面八员环,而环内Ag,Ag间距分别是0.314,0.3l0(nm),均未成键。不对称单元中的二个八员环通过的O原子与环上Ag原子的弱成键而具有结构联系。环内还出现了罕见的三配位Ag原子。 相似文献
10.
利用X-射线衍射分析测定了标题化合物的晶体结构.C24H20NO3Cl属单斜晶系,空间群P21/n,Mr=405.88,a=11.625(3),b=13.844(3),c=22.643(4)×10-10m,β=94.80(2)°,V=2015.(1)×10-30m3,Z=4,F(000)=848,Dc=1.33g/cm3,R=0.084和Rw=0.096.含有氧的六圆环为半椅式构象,五圆环和它相邻的苯环几乎共面.C(14)与O(1),C(21)与O(1)为典型的Sp2-Sp2键,使相邻两个苯环之间产生了共轭 相似文献
11.
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. 相似文献
12.
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. 相似文献
13.
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。 相似文献
14.
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. 相似文献
15.
Miao Maosheng 《华南师范大学学报(自然科学版)》2014,(6)
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- 相似文献
16.
Yang Weitao 《华南师范大学学报(自然科学版)》2014,46(6):137-138
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- 相似文献
17.
Bernard Kirtman 《华南师范大学学报(自然科学版)》2014,(6)
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 相似文献
18.
《上海师范大学学报(自然科学版)》2014,(5):550
<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 相似文献
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《吉林大学学报(理学版)》2014,(5):1105
<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has 相似文献