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1.
近年来,有机电致发光材料的研究吸引了科学家的极大兴趣,8-羟基喹啉衍生物及其配合物具有较好的发光性质,许多研究人员在该方面做了研究。以5-硝基-8-羟基喹啉和Zn(NO3)2·6,H2O用常温搅拌的方式合成了锌配合物Zn(C9H5N2O3)2(CH3OH)2,对其进行了红外光谱、元素分析、X射线单晶衍射结构测定等表征。该配合物属于单斜晶系,C2/c空间群。以398,nm为激发波长,测定了配合物的荧光发射光谱,配合物在560,nm处有发射峰。与配体及其他类似配合物相比,配合物发光波长有明显的红移,能起到调控发光颜色的作用,可开发成为新的电致发光材料。  相似文献   

2.
简述8-羟基喹啉金属配合物的发光原理.综述了8-羟基喹啉金属配合物发光材料的国内外研究现状,同时对8-羟基喹啉金属配合物发光材料的应用前景进行了展望.  相似文献   

3.
以六水氯化钐、邻香草醛缩甘氨酸席夫碱、8-羟基喹啉为原料,合成了邻香草醛缩甘氨酸席夫碱8-羟基喹啉稀土钐的三元配合物,通过元素分析、红外光谱、紫外光谱、热分析对配合物的结构进行了表征.实验表明,席夫碱脱质子以羧酸根的O原子与稀土Sm3+配位,而8-羟基喹啉脱质子后以酚羟基O和环上的N双齿配位,形成五元螯环.差热分析结果表明配合物热稳定性较好,不含结晶水,在300℃与550℃时,依次完全失去两种配体,最终分解产物为Sm2O3.初步推断该配合物化学式为Sm(C10H1 0NO4)2C9H6NO.  相似文献   

4.
设计合成了2个含吡啶环2-乙烯喹啉-8-羟基喹啉金属锌配合物的同分异构体,用FT-IR、FAB-MS和元素分析表征了结构,热重分析结果表明化合物3和4的玻璃化转变温度分别在204 ℃,228 ℃. 光致发光(PL)光谱测试结果表明,化合物3的发光峰值为612 nm,橘红色光;化合物4的发光峰值为630 nm,发红色光.用化合物4与TPD组装为双层电子器件,电致发光峰值为656 nm.  相似文献   

5.
用阳极腐蚀法制备了多孔硅 (PS) ,合成了三 (8_羟基喹啉 )合铝配合物 (AlQ3 ) ,通过浸渍法制备了PS_AlQ3 杂化材料 ,并研究了其室温光致发光性能。结果表明 :利用浸渍法确能将AlQ3 掺入PS中 ,这种杂化材料同时保留了PS和AlQ3 的部分发光性能  相似文献   

6.
合成了一种新型的2-苯基-8-羟基喹啉配合物.利用元素分析、红外吸收光谱等方法对配合物的组成进行了分析,分析结果表明:2-苯基-8-羟基喹啉可与锂离子以1:1的比例形成配合物;对比研究了2-苯基-8-羟基喹啉锂和8-羟基喹啉锂的荧光性质,前者的荧光发射峰位置较后者红移了37 nm.从而说明苯环的取代增加了有机配体π-π共轭的程度,使HOMO-LUMO之间能隙变小,引起发射峰红移.  相似文献   

7.
通过磁性、粉末X-射线衍射和TC-DTA分析等方面对4个8-羟基喹啉两亲配合物的性质进行了研究,依此推测了各配合物的结构,配合和的MnL2、ZnL2和LaL2C1.4H2O为扭曲的八面体结构;CuLC1可能是由通过两个氯桥形成的二聚体。8-羟基喹啉两亲配合物具有强的荧光性质,可以用作电发光器件的发光材料。  相似文献   

8.
作者制备了新型的混配化合物 NiL_2(Dpbs)_2,式中;L 为乙二醇、邻苯二酚、邻氨基苯酚、苯二胺、8-羟基喹啉。并对配体及配合物的 IR,UV,TG-DTA 及电导进行了分析。数据表明:L 与金属离子以五元环的形式配位,配合物具有扭曲的八面体结构,配合物比配体的热稳定性高,在二甲基甲酰胺和甲醇中为非电解质。  相似文献   

9.
以1,1′-二甲酰氯二茂铁与双(8-羟基喹啉)联苯胺席夫碱为原料,通过缩聚反应得到了二茂铁-8-羟基喹啉型缩聚物,再与不同金属离子(Co,Ni,Cu)配位,获得了一类新型的聚二茂铁-双(8-羟基喹啉)金属配合物.用红外光谱(IR)、元素分析、差热分析(DSC-TGA)、X射线衍射(XRD)及荧光光谱对金属配合物的结构与性能进行了研究.结果表明,配位金属参与后,提高了缩聚物的热性能.XRD研究表明配体与金属配合物均呈现短程有序的微晶态.配体和配聚物的荧光性能分析表明,化合物的发射谱出现在425-550 nm之间,并且呈现三重荧光性质,在配体与金属离子配合后,其荧光强度增强.  相似文献   

10.
首次在室温条件下通过固相法合成了了铈水杨酸8-羟基喹啉三元配合物Ce(Hsal)2(hq)(hq-=C9H6NO^-;Hsal^-=C7H5COO^-).产物经元素分析、红外光谱、X-射线粉末衍射、热重-差热分析等手段确定了配合物的组成、结构以及成键特征.X-射线粉末衍射结果表明:8-羟基喹啉的加入使反应迅速完成,同时分析了可能的固相反应机理.抑菌实验表明该类配合物对常见的细菌和真菌有比较好的杀灭效果.  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.
王慧 《科技信息》2008,(10):240-240
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.  相似文献   

16.
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.  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.
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   

19.
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   

20.
1 Rise of studies on climate change's effects on biodiversity
Until the 1980s, climate change and biodiversity were studied as two independent disciplines for more than a century. In 1992, the Ecological Society of America's annual report named climate change, biodiversity, and the sustainable ecological system as the three major global environmental issues of the twenty-first century [1].  相似文献   

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