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1.
RECl3与丙氨酸配合行为的半微量相平衡研究   总被引:1,自引:1,他引:1  
用半微量相平衡法研究了RECl3-Ala-H_2O(RE=Sm,Dy,Yb)在25℃及全浓度范围内的溶度性质。结果表明每个体系中分别形成两种不同配比的配合物。在相平衡结果指导下,合成了RE(Ala)_3Cl_3·3H_2O(RE=La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,RE(Ala)_2Cl_3·nH_2O(RE=La,Ce,Pr,Nd,Sm,n=3;RE=Ho,Yb,Y,n=4)和RE(Ab)Cl_3·6H_2O(RE=Eu,Gd,Tb,Dy,Ho,Yb,Y)。发现了RECl_3与丙氨酸形成配合物的“三分组”规律。  相似文献   

2.
在相平衡结果指导下,合成了系列的通式为RE(Gly)2(NO3)3·2H2O(RE=La-Nd,Sm-Er,Yb,Y;Gly=Glycine)的固体配合物.采用TG-DTG法,在氧气气氛下对配合物的热分解机理进行研究,并用DSC测定了它们的脱水焓.  相似文献   

3.
RECl3与丝氨酸配合行为的半微量相平衡研究   总被引:2,自引:2,他引:2  
用半微量相平衡法研究了RECl3-Ser-H2O(RE=Nd,Gd,Yb)在25℃及全浓度范围内的溶度性质。结果表明在这些体系中有6种三元配合物形成:RE(Ser)Cl3·3H2O与RE(Ser)2Cl3·5H2O(RE=Nd,Gd,Yb)。在相平衡结果指导下,制得了20种固态配合物,用化学分析确定了配合物的组成。  相似文献   

4.
以吡啶乙酸内盐,简称pyb)为配体,在pH2.5和3.5下分别合成了2类配合物。经过元素分析和红外光谱等分析,确定了配合物的组成分别为RECu(Pyb)_5(ClO_4)_5·nH_2O(RE=La,Ce,Nd,Sm,Gd,Dy,Er,Y)和RE_6Cu_(12)(OH)_(24)(Pyb)_(12)(ClO_4)_(18)·nH_2O(RE=La,Ce,Nd,Sm,n=32;RE=Gd,Dy,ErY,n=28),观察了Nd~(3+)的水溶液中,分别加入Pyb,Pyb和Cu~(2+)或Mn~(2+),Ni~(2+),Prb[三甲基按丙酸内盐,(CH_3)_3N~+,简称Prb],Prb和Cu~(2+)后,f-f超灵敏跃迁吸收光谱的变化。结果表明,在pH2.5和3.5下,Cu~(2+)均使Nd~(3+)·pyb体系超灵敏跃迁的振子强度增大,且增大值相同,Cu~(2+)对Nd~(3+)-Prb体系、Mn~(2+)(或Ni~(2+))对Nd~(3+)-Pyb体系超灵敏跃迁吸收光谱均无影响,讨论了超灵敏跃迁振子强度变化与杂金属配合物形成的关系。  相似文献   

5.
首次合成了镧(La)、镨(Pr)、钕(Nd)、钐(Sm)、钆(Gd)的果糖-高氯酸固体配合物以及La,Pr,Nd,Sm,Gd和Eu(铕)的硼酸-果糖配合物.利用化学分析,IR,1HNMR,UV和热谱等物理化学手段对这两系列共11个配合物的组成和成键情况进行了表征,并对它们的某些物理化学性质进行了研究.结果表明:稀土-果糖-高氯酸配合物的组成为:RE3(C6H11O6)5(OH)2(ClO4)23H2O(RE=La,Pr,Nd,Sm,Gd);稀土-果糖-硼酸配合物的组成为:RE(C6H12O8B)2Cl2CH3OH,(RE=La,Pr,Nd,Sm,Eu,Gd).  相似文献   

6.
七种稀土硫代脯氨酸配合物的合成与性质表征   总被引:7,自引:0,他引:7  
作者文合成了七种未见文献报道的稀土与硫代脯氨酸的配合物,并对其进行元素分析、摩尔电导测定、热重分析、差热分析和红外光谱分析等,确证配合物的组成为RE(tcH)3(NO3)3.nCH3OH(RE=La、Ce、Pr、Nd、Sm、Gd、Y;n=1、2),并对其成键部位进行讨论。  相似文献   

7.
报道了对称的八齿(N6O2型)双核配体N,N,N′,N′-四(2′-苯并咪唑甲基)-1,4-二乙氨基乙二醚(EGTB)及两种含锰(Ⅱ)双核配合物:(Mn2EGTB(OAc)2)(BPh2).3H2O(I),(Mn2EGTB(OAc)Cl)Cl2.2CH3OH.H2O(Ⅱ),对(I),(Ⅱ)进行了^1HNMR,UV-Vis,摩尔电导,中远红外,EST和循环伏安研究,初步推测配合物(I)和(Ⅱ)分别具  相似文献   

8.
采用乙醇-水溶液析出法合成了稀土离子RE3+(La3+,Nd3+,Gd3+,Dy3+,Y3+,Yb3+)与间硝基苯甲酸(HA)和邻菲罗啉(phen)的二元及三元固态配合物.通过元素分析、热重分析证实配合物组成为NdA3·3H2O,REA3·2H2O(RE=Gd,Dy),REA3(RE=Yb,Y)和LaA3·phen.考察了配合物的红外光谱、紫外光谱、荧光光谱和溶解性.  相似文献   

9.
测定了Gd(NO_3)_3/Er(NO_3)_3-Gly-H_2O三元体系在25℃时的溶度和饱和溶液折光率。各体系的溶度和饱和溶液折光率曲线均由4支组成,分别与RE(NO_3)_3·nH_2O(RE=Gd,n=6;RE=Er,n=5)、配合物RE(Gly)_2(NO_3)_3·2H_2O,RE(Gly)_4(NO_3)_3·H_2O及Gly相对应。  相似文献   

10.
合成了通式为(C15H15N2O3)xRE(NO3)y(H2O)z(当RE=La~Pr时,x=3,y=6,z=0;RE=Nd时,x=2,y=5,z=1;RE=Sm~Lu,Y时,x=2,y=5,z=0)的一系列15种标题配合物.通过元素分析,IR,UV,1HNMR,TG-DTA,摩尔电导和X射线粉末衍射分析等对配合物的性质进行了表征.认为可能生成包含一分子水的11配位钕配合物的原因在于抗衡阳离子的空间效应,使其与络阴离子间的vanderWaals力增强的结果  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.
何延凌 《科技信息》2008,(4):258-258
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.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

14.
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   

15.
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   

16.
AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…  相似文献   

17.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

18.
In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.  相似文献   

19.
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   

20.
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   

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