电子偶

The results indicate that the weak election-withdrawing group 4-hydroxymethyl in 4-position of pyridine in 4-HMDPA could weaken the fluorescence intensity of the lanthanide complexes. The contradistinctive experimental results show that the fluorescence intensities of these complexes are related to pH value of the aqueous solution and the dipole moment of solvent molecule: in the neutral aqueous solution,the fluorescence intensities of these complexes were strongest,while the less the dipole moment was,the stronger the fluorescence intensity was.

结果表明，在吡啶4位引入弱吸电子基团4-羟甲基会减弱稀土配合物的荧光强度；在水溶液中稀土配合物与溶液的pH值有着密切的关联，中性水溶液中荧光强度较大；分子偶极矩较小的溶剂中稀土配合物荧光强度较强。

An unmagnetic material which permanent magnetic distance and single electron are zero is selected as magnetic diluter system. The magnetic strength of high magnetic nanomaterials CoFe2O4 has been characterized using Gouy magnetic balance by adding magnetic diluter system in samples so that the high magnetic of nanoparticles is diluted. The magnetic strength with different nanoparticles size is studied.

采用永久磁矩和未偶电子为零的无磁性物质为磁稀释体系，将纳米材料的强磁性稀释后，用Gouy磁天平表征了不同粒径系列的强磁性纳米材料CoFe2O4的磁化强度，探讨了纳米材料粒径与磁稀释体系磁化强度的关系。

The molecular electronic structures and dipole moments are calculated by use of density functional theory at ab initio level.

分子的电子结构和电偶极矩是基于密度泛函理论利用从头计算方法得到的。

LPOXD contains azobenzene and long side chain of alkyl, and shows photo absorption property, good solubility and high electron affinity, which can be used in the filed of optics, and as electron-transport and electroluminescent material.

含有偶氮苯和长烷基侧链的LPOXD，具有光响应性能、优良的溶解性和高的电子亲和势，有望在光学领域、电子传输材料和电致发光材料中得到应用。

Following the analysis, a new calculation model is developed, which takes the effect of the induced dipole moment of one atom on the polarizability into consideration, and the mathematical expressions are deduced in the cases of macro electric field parallel and perpendicular to the molecular axis, and at a random angle with the axis.

该模型考虑了分子内原子偶极矩对电子位移极化的影响，推导了宏观电场与分子轴平行、垂直、呈任意夹角等典型情况下的非对称双原子分子的电子位移极化率的数学模型。

This paper discusses the alkyl′s attracting electron effect,and by the calculation of dipolar moment it analyses the cause of the alkyl′s attracting electron effect.

扼要介绍了烷基的吸电子效应，并通过偶极矩的计算分析了甲基吸电子效应的成

The charges on the substituents affected OWF〓 greatly for some azobenzene derivatives, pyridone derivatives, nitrodiphenylamine derivatives, some reactive dyes and 1, 4-diamino anthraquinone derivatives, in this instance, OWF〓 changed linearly with the change of the charges.

2给电子取代基或吸电子取代基的电荷对OWF〓有较大的影响，OWF〓随电荷的变化而线性变化，如某些偶氮苯衍生物、吡啶酮类染料母体、硝基二苯胺类化合物、偶合组分和重氮组分之间夹角α变化不大的活性染料、1，4—二氨基蒽醌衍生物等。

Under these conditions several aryl iodides bearing awide range of functional groups were converted into the corresponding aryl azides in good yields.

在重新优化后的条件下，大部分不活泼芳基溴化物可以与叠氮化钠发生交叉偶联反应得到良好收率的芳基叠氮化储蓄型投资银条合物，但是有拉电子基团取代的芳基溴化物与叠氮化钠的偶联反应则难以进行。

The transition dipole moments of neutral and charged Green1 are compared using 3D transition density, which reveal the orientation and strength of transition dipole moments. The charge redistribution of neutral and charged Green1 upon excitation are shown and compared with 3D charge difference density. The electron-hole coherences of neutral and charged Green1 upon excitation are investigated with 2D site representation.

用3D跃迁密度方法对中性和带电的Green1的跃迁偶极矩进行比较，可显示出跃迁偶极矩的取向和强度；用3D电荷差异密度方法显示出激发后的中性和带电的Green1电荷重新分布，也进行了比较：用2D实空间分析方法来研究中性和带电的Green1处于激发态时的电子空穴相干性。

Both electronic and steric effects were observed for the homo coupling of aryl iodides. Electro-withdrawing and ortho substituents gave desired products in low yields.

在取代碘苯的偶联反应中观察到电子效应和位阻效应的影响，吸电子基取代和邻位取代对反应不利。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐