金属键

This thesis mainly focuses on the catalytic carbon-carbon bond formation using gold catalysts.

本论文主要是在研究金属金催化剂，催化环化碳-碳键生成的反应。

The result indicated that MgO and α- methacrylic acid can together thicken epoxy, and the speed of thickening epoxy become quickly with the increasing content of MgO; when the ratio of MgO and α- methacrylic acid is 3:1, thickening epoxy have a better effect; the thickening mechanism: the terminal corboxyl group of α- methacrylic acid react with MgO, and it accompany with large numbers of heat, the heat can accelerate the reaction between the terminal corboxyl group with the secondary hydroxyl groups of epoxy, intermolecular hydrogen bonding which the water of above-mentioned formation result in and complex compound which format the metal atoms and carbonyl group complexing collective increase the viscosity of epoxy resin.

结果表明：MgO和α－甲基丙烯酸配合可增稠环氧树脂，随着MgO加入量的增加，环氧树脂增稠的速度加快；MgO与α－甲基丙烯酸为3：1时，增稠环氧树脂的效果较好；推测环氧树脂的增稠机理是α－甲基丙烯酸中的端羧基与氧化镁反应，放出热量促使其端羧基与环氧树脂中的仲羟基反应，上述反应生成水产生的氢键和羰基与氧化镁中的金属原子形成络合物共同导致环氧树脂的粘度增加。

The bonds of early transition metal monoxides are stronger than those of later transition metal monoxides.

这也说明了对于d轨道未半满的早周期过渡金属来说，d电子易于参与成键生成高氧化价态分子。

The electron location function shows the electronic density changes at both the atomic vacancies and antisites. There is an obvious absence of electronic areas where the vacancy of Ga has the dangling bonds of N, which are favourable for the sdsorption of metal atoms. In contrast, at the vacancy of N, there is more electron distribution(ELF:0.16-0.45), forming lone electron pairs which are profitably available to combine electronegative atoms.

电子局域函数显示了表面空位和替位处的电子密度变化，表面Ga原子空缺处有非常明显的缺电子区域，悬挂键临近N的电子密度增大，有利于对金属原子的吸附；N原子空位处的ELF值为0.16-0.45，有利于同电负性较大的原子结合。

Generally the catalysts have high activity and good selectivity. At present the coupling reactions of organoborahes with terminal olefins s acid chlorides and aryl halides play an important synthetic approaches in organoborane chemical. The catalysts can be used by many kinds of organometal compounds such as: irons cobalt nickel ruthenium rhodium palladiums titaniums zirconiums tins indium and lithium organic compounds; The achievement has been amazed in preparing of unsaturated or saturated compounds and in synthesizing of natural products bioactive molecules and chiral compounds.

目前，卤代烃与不饱和烃的偶联反应和有机硼试剂与酰卤和卤代烃的偶联反应已成为有机合成的研究热点，此类反应可用铁、钴、镍、钌、铑、钛、锆、锡、铟、锂等多种有机金属化合物来催化，用于形成含饱和或不饱和C-C键的化合物，并已在天然产物、液晶、具有生理活性物质和手性化合物的合成中应用。

Changsha, Hunan Tianming Machinery Industrial Co., Ltd. is a transmission gear, rack, chain wheel, crane slewing reducer, coupling, machine tool accessories, dual-metal bushing, pulley, bevel gear, helical gear, charcoal machine, worm gear, non - Standard design and processing, construction of the lift gear, manual steam valve, screw and nut, machine, ring gear, spline shaft and other products Co., Ltd. specializes in processing, the company is headquartered in Changsha, Hunan, Changsha, Hunan Tianming transmission machinery Industrial Co., Ltd. has a complete and scientific quality management system.

湖南长沙天明传动机械实业有限公司是齿轮、齿条、链轮、塔吊回转减速机、联轴器、机床配件、双金属衬套、皮带轮、锥齿轮、螺旋齿轮、木碳机、蜗轮蜗杆、非标设计及加工、施工电梯齿轮、手动汽阀、丝杆及螺母、分切机、内齿轮齿圈、花键传动轴等产品专业生产加工的股份有限公司，公司总部设在湖南长沙，湖南长沙天明传动机械实业有限公司拥有完整、科学的质量管理体系。

Employing high-dilute method and 5-fold excess amine prepared two new "two-armed" acyclic diamine intermediates I_a and I_b, which are also intermediates of synthesizing microcyclic compounds, and eight aromatic Schiff bases, II_, were synthesized from reaction of I_a or I_b condensing with different aromatic aldehydes. Their composition and structure were characterized by Elemental analysis, IR, UV-Vis, LIF,~1HNMR and MS. The hydrogen bond interactions and MS fragmental patterns were also discussed.3. Several novel transition metal complexes using II_a as ligand were synthesized and identified by Elemental analysis, IR, UV-Vis,~1HNMR and molar conductivity.

1，采用高度稀释及胺过量五倍的方法合成了两个具有吡啶双酰胺臂的非环二胺Ⅰ_a和Ⅰ_b，并以它们为中间体进一步合成了八个芳香席夫碱Ⅱ_a-Ⅱ_h，通过元素分析及各种波谱测试鉴定了它们的组成与结构，对化合物的UV-Vis、LIF、IR、~1HNMR及MS进行了较为详细的讨论，还探讨了席夫碱的氢键相互作用及质谱裂解方式； 2，以席夫碱Ⅱ_a为配体合成了几个新型的过渡金属配合物，并通过元素分析、UV-Vis、IR、~1HNMR、摩尔电导及DTA—TG对其进行了表征，讨论了化合物的配位情况及配体在配位中的脱质子行为。

Rare fine to the best remote control vehicle model, according to original vehicle 1 to 32 proportions fine, as slightly as a trademark, completely presses the original vehicle manufacture, the sparkling chrome-plating part, put in yours book shelf most appropriate only, the unique wristwatch infrared remote control operation, in the world the smallest remote control vehicle remote control, the ultra cruel wristwatch remote control, pressed on the wristwatch the button, could control this racing bicycle to the different direction advance, the backlash and the curve, but exchanged the ordinary vehicle mold chassis, turned an ordinary static vehicle mold, the replacement process extremely was also convenient, The entire screw organization, and has the tool oh, a vehicle actually has two uses ways, this it specialest place, the zinc base alloy +ABS engineering plastics material quality, the front of a train for the entire zinc base alloy metal manufacture, the front of a train and the oil pot might separate, the vehicle door may open, presses down on the wristwatch remote control the start key, the truck sends out immediately with the real vehicle same start thunders the sound, stopped when also had the braking sound, the ultra fine paint surface worked, the detail decided all perfect principles!

罕见的精细到极致的遥控车模型，按原车1比32比例精致，小到一个商标，全部按原车制作，闪闪发光的镀铬部件，放在您的书柜中最合适不过的了，独特的手表红外线遥控操纵，世界上最小的遥控车遥控器，超酷的手表遥控器，按动手表上的按钮，就能控制这台跑车向不同的方向前进、后退和转弯，而换上普通的车模底盘，就又变成了一部普通的静态车模了，更换的过程也极其方便，全螺丝机构，并配有工具哦，一部车却有两种使用方式，这就它最特别的地方了，锌合金+ABS工程塑料材质，车头为全锌合金金属制作，车头和油罐可分离，车门可开启，按下手表遥控器上的启动键，卡车立刻发出和真车一样的启动轰鸣声，停车时还有刹车声，超精致的漆面做工，细节决定一切的完美主义！

The functional group linked to carbyne carbon has a strong effect on the reactivity and strength of metal-carbon triple bond.

在卡拜化合物中，与卡拜碳上相连的基团的性质强烈影响金属—碳三重键的强度及其反应活性。

Department of Organic Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel.

研究小组发现，将这种络合物与水混合后，氢原子和氧原子间的键合被打破，一个氢原子不再与其有机部分相连，而剩下的氢原子和氧原子仍束缚在金属中心。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。