金属键

WithinPMAO LB films,because the distance between the metal ions is no morethan 0.3nm,the carboxylate groups of a molecule form a nanoparticle(the size is less than 0.2nm)by the hydrogen bond or metal ion asthe bridges.

实验表明，在这种高羧基密度的聚合物中，由于羧基距离较近(＜0.3nm)，羧基通过氢键或金属离了为桥在分子内聚集成纳米团簇(＜2nm)。

The coordination of noble gas atoms leads to a shift of the M-O stretch frequency.

由于稀有气体原子的配位，影响了过渡金属氧化物M-O键的强弱，从而导致M-O伸缩振动频率发生位移。

The metal ions form ionic bonds, which are nondirectional, with oxygen atoms that previously had been bonded rigidly to specific Si atoms.

金属离子与氧原子形成无方向性的离子键，而氧原子之前一直牢固结合在特殊的硅原子上。

At present, studies on multiple-bonded organometallic complexes have been regarded as one of the most remarkable fields in catalytic reactions.

目前，多重键金属有机化合物的研究已成为催化化学领域中一个引人注目的研究热点。

Multiple-bonded organometallic complexes have been employed in catalytic reactions with excellent catalytic activity.

多重键金属有机化合物在多种催化反应中已经得到广泛的应用，并取得了很好的研究成果。

There are polyhedron clusters in the form of bonded pairs in liquid metals.

液态金属中存在由键对构成的多面体团簇。

Studying the interactions and mechanism of metal complexes binding with DNA may be a more complete understanding of the origin of life on a molecular level, which have great theoretical significance and potential applied values in biological science.

研究金属配合物与DNA相互作用的键合机理将有助于人们从分子水平上了解生命现象的本质，在生命科学上具有重要的理论意义和潜在的应用价值。

Objective: To determine the rate constants for the cleavage of pyrophosphate to phosphate by human serum apo-transferrin.

目的：测定人血清脱金属铁传递蛋白裂解焦磷酸键的反应速率常数。

A post-mortem machine then cut open the stomach to check the power switch and reset the internal key piece of metal contacts and the contacts to connect the phenomenon of whether there is any short-circuit power.

于是将爱机开膛剖肚，检查电源开关及复位键内部金属接触片的接触情况和连线是否有电源短路现象。

Being combining with products distribution in styrene oxidation, we propose the styrene epoxidation carry out with Ti metallacyclo intermediates, And at the same time Ti-ZSM-5 have properties both catalytic epoxidation and acid-catalysis, namely the skeletal Ti can catalyze styrene epoxidation to styrene oxide and the skeletal Ti and Al can provide Lewis acid site to cause the rearrangement of styrene oxide to phenylacetaldehyde rapidly, the solvolysis to glycols and the cleavage of C=C double bond. Ti-ZSM-5 can also provide Bronsted acid site simultaneously, which is also catalytic center for the solvolysis to glycols.

同时结合Ti-ZSM-5催化选择性氧化苯乙烯反应的产物分布结果，提出苯乙烯环氧化反应可能是通过金属有机环机理进行；Ti-ZSM-5同时具有催化环氧化和酸催化两种功能，其骨架钛可催化苯乙烯环氧化生成环氧苯乙烷，而骨架钛和骨架铝等可提供Lewis酸位使环氧苯乙烷迅速发生重排生成苯乙醛从而使其成为反应的主要产物，同时还可发生加成以及碳碳键的裂解等副反应：Ti-ZSM-5也提供Bronsted酸位，它也是生成加成产物的活性中心。

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。