配基

The fluorescence properties of complexes of europium with β-diketone and terbium with benzoic acid and its derivatives were analyzed and the synergic effect of the second ligand was illustrated from the energy matching of the minimum triplet state of ligands and the resonance energy level of rare earth ions.

提出了掺杂离子荧光增强效应的机理。 4。首次采用ab initio CIS方法，在劈裂价层基组3—21G水平上对各配体进行了量化计算，系统分析了前线分子轨道特征和激发态的能级，从配体最低激发三重态能级与稀土离子共振能级的能级匹配，分析了铕与β-二酮的配合物的荧光性能和铽与苯甲酸系列衍生物的配合物的荧光性能，解释了第二配体的协同效应。

The knowledge data base management system based on the principle of expert system is used to store the designer and matcher's experience, and a heuristic rule-based system is used to perform the similar produce designing and matching assistant.

利用专家系统的知识构造法建立了基於设计人员和配试人员经验的知识库，用一定的推理规则进行相似产品的设计和辅助配试，使设计周期大大缩短，配试成功率得以提高。

Mn-complexes in which Mn atom ligand with the N atom within ligand can stimulate the recovery of electron transfer and oxygen evolution. The trinuclear Mn-complex is extremely sensitive to the addition of CaCl2. It is suggested that there is an interaction between Ca2 and carboxyl within the trinuclear Mn-complex during photoactivation and this interaction benefits the ligation of Mn atom to the apo-WOC and form an active WOC. Binuclear MnMn complex shows slightly higher efficiency than binuclear MnMn complex in restoration of O2 evolution activity. It is suggested from our results that recovery of electron transport and O2 evolution with synthetic Mn-complexes is affected by different factors. Cl- can stimulate the reconstitution of WOC at the concentration of over 100mM;the maximal recovery of O2 evolution activity requires the presence of CaCl2 and 33 kDa protein polypeptide together. Bicarbonate can stimulate the reconstitution of WOC.

锰配合物中锰原子与配体中的氮原子配位连接时，能显著恢复电子传递活性和放氧活性；三核锰化合物在重组时对CaCl2的存在非常敏感，我们认为Ca2 与三核锰化合物中的羧基之间存在一定的相互作用，而这种作用有助于锰原子的光配位进而使三核锰化合物易于组装成有活性的水氧化复合物：双核锰化合物MnMn比双核锰化合物MnMn在恢复放氧活性方面更有效；影响锰化合物电子传递能力恢复的因素与影响锰化合物放氧活性恢复的因素不同；在锰蔟重组过程中，氯离子的浓度必须在100mM以上，才能有效进行光重组；最大光重组效率的获得必须有钙离子和33kDa多肽同时存在；碳酸氢根离子促进锰化合物与去锰光系统II的光组装。

The integrated analytical results show that the novel ligand coexists in ketoform and enolform structures under the measuring conditions, the ketoform structure may change into the enolform structure during the coordination and bonds with the central ion by two O atoms of the enolized hydroxyl group of pyrazolone ring and H2O and the N atom of the imine group and the N atom containing H of benzimidazole ring by losing the proton. And the coordination number of these complexes is four.

综合各种分析结果显示：配体在测试条件下以酮式和烯醇式结构共存，配位时酮式可能转化为烯醇式结构，按去质子的方式以吡唑啉酮环羟基和H2O上的两个O原子以及亚胺基上的N原子和苯并咪唑环上的含氢N原子与中心离子成键，配合物的配位数为4。

Ten kinds of metal and three kinds of organic templates, including ethylenediamine, 1,4-butylenediamine and pyrazine were used in the synthesis of metal phosphonate coordination polymers.

在所合成的16种金属有机膦酸盐配位聚合物中，有机配体为2-羟基乙酰基膦酸，用于配位的金属离子共10种，模板剂3种分别为乙二胺(en，1，4-丁二胺，哌嗪。

It is the first time that these phenomena were observed: Two nuclei are surrounded by plasma and locate at the central of the female gametophyte and the others nuclei are positioned at the fringe of the female gametophyte; Before the pollen tube enters the female gametophyte. the nuclei in chalazal end begin splitting of plasma and form multinuclear cell.4. The pollens of Gnetumc are spherical or applanate with single aperture. The ornamentation of exine is spine. The basis part of spine is lenience and the top part of spine is tip or obtuse sphere.

首次在买麻藤属植物的雌配子体中观察到2个游离核位于配子体的中央位置，且被一团原生质所包围的，其余的游离核位于边缘的现象以及花粉管进入雌配子体前，合点端的核已经发生胞质分裂形成多核细胞的现象 4、买麻藤的花粉近球形或扁平型，有单萌发孔，外壁表面具小刺状纹饰，小刺基部宽大，末端尖或钝圆。

The spectral data suggest that intramolecular carbonyl oxygen to tin coordination in 1 is existent and is not allowedin order to accommodate two and three bidentate dithiocarbamate ligands in 3 and 4 respectively.

波谱数据表明化合物1和2存在着分子内羰基氧原子对锡原子的配位，而在化合物3和4中这一配位则被两个或三个双齿二硫代氨基甲酸配体所替代。

Totally 17 new type of fulvene ligands have been synthesized by the reaction of substituted-benzoyl chloride with Cp and substituted Cp anions. All the new compounds are fully characterized by infrared spectroscopy,!

我们利用含芳香取代基的环戊二烯丛负离子与含-CN、-I、-CO_2CH_3等配位有机基团的芳酰氯反应成功地合成了17个既含芳香基团又含杂原子配位基团的刚性共轭富烯类配体。

As for the ester exchange reaction on phosphorus, it was found that N-phosphoryl histidine the fastest one among all of the N-phosphoryl aminoacids. The results studied by MNDO method indicate that due to theparticipation of imidazole group, the formation of hexa-coordinatephosphorus intermediate made the iso-propoxyl which is opposite toimidazole group more active than the other ones and much easier to leave.When iso-propoxyl left, a new penta-coordinate phosphorus intermediate wasformed, and it is sterically favorable to be attacked by an alcohol from theopposite direction of imidazole.

对于磷上酯交换反应，实验中发现N-磷酰组氨酸反应速度明显高于其它N-磷酰氨基酸，理论研究表明，侧键咪唑基参与下六配位磷中间体形成后，位于咪唑基对面的异丙氧基反应活性大大提高，即从咪唑基的对面位置发生异丙氧基的离去和另一分子醇的进攻，在能量上和空间上都是有利的。N-磷酰丝氨酸的磷上酯交换反应有着类似的特点。

And we also research the impact of methylating on hydrogen bond and stacked bond in base pairs under considering water molecules.

研究结果表明，烷基化之所以能造成碱基错配是它可使碱基的质子迁移或烯醇互变现象容易发生，改变原有原子的电荷分布或配对模式，同时碱基自身的互变异构体会跟烷基作用，致使互变异构体能够稳定存在，影响正常碱基配对，引起碱基诱变，造成生理疾病的发生。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了