桥键

含1,1-二氟乙撑基和乙炔基的C2桥键类液晶的合成

Synthesis of Liquid Crystal Containing C_2 Bridge of 1,1-difluoroethane or Ethyne Group

平面型四核铜簇合物Cu4（CH2XMen）4桥键性质的密度泛函研究

Density functional studies on bridge bond properties of square-planar tetranuclear copper clusters Cu_4 ( CH_2XMe_n ) _4

C2桥键类液晶的合成进展

Progresses on the Synthesis of Liquid Crystals Containing C_2 Bridged Group

富勒烯C（60）硫桥键联四硫富瓦烯衍生物的理论研究

Theoretical Study of the [ 60 ] Fullerene Sulfur-bridge Covalent Bond Linked Tetrathiafulvalene Derivatives

C2桥键类液晶的合成进展分子中含-CH2O-桥键液晶化合物的结构和相变间关系

Progresses on the Synthesis of Liquid Crystals Containing C_2 Bridged Group Relation between Structure and Function of Liquid Crystal Compounds with CH 2O Inter ring Linkage

论述了JS水下混凝土抗分散剂的作用机理主要表现在桥架作用，表面活性作用和桥键作用3个方面。

The paper states its action mechanism mainly expresses in bridge action , surface activated action and bonding action .

本文报道5个7-取代6,14-桥键蒂巴因衍生物的~（13）C-NMR谱。

The ~ ( 13 ) C NMR spectra of five 7-substituted 6,14-bridged thebaine derivatives ( 1-5 ) are reported .

硼烷缺电子多中心桥键的H-F力研究

A Study of H-F Force for Multicentre Bridge Bond in Electronic Deficient Molecule Boranes

提出了-βSiC（001）-3×2表面金属化的一种新机制：通过形成氢桥键（Si-H-Si复合结构）形成表面n型掺杂。

We show that the surface metallization arises from a novel mechanism of n-type doping of surface band via formation of hydrogen bridgebonds ( i.e. , Si-H-Si complex ) .

二硫苏糖醇（DTT）对复合物中联结R&PE与APC间的脂族二硫桥键的还原导致分子内能量传递的阻断这一现象进一步证实了复合物中存在分子内能量传递现象。

The phenomena of by DTT reduced the aliphatic disulfide bridge between R-PE and APC in the conjugate further verified the intramolecular energy hansfer from R-PE to APC .

在掺氧的a-si：H中，红外吸收光谱显示出氧原子主要作为氢原子附近的弱Si-Si键的桥键原子。

The IR absorption spectra show that in oxygen-doped a-Si : H Films , oxygen atoms serve as bridging atoms in the Si-Si weak bonds .

简要评述了C2桥键类液晶的合成研究进展。含C2桥键类液晶的光、热、化学稳定性好，具有粘度低、驱动电压低等优良性能，在液晶混配中应用十分广泛。

The progresses on the synthesis of liquid crystals containing C 2 bridged group , which have high stability to light , heat , chemistry and been widely used in the mixture of liquid crystal , are reviewed with 15 references .

钕原子与3个η5-C5H5基团配位，且两个（C5H5）3Nd经氢桥键相连构成阴离子。Nd1-H和Nd2-H键长均为0.218（1）nm。

The neodymium atom is coordinated by three η ~ 5-cyclopentadienyls , and two ( C_5H_5 ) _3Nd species are connected by one hydrogen bridge to form the anion with Nd-H 0.218 ( 1 ) nm .

乙撑基桥键类含氟液晶的合成及性能研究

Synthesis and Properties of Liquid Crystals Containing Ethylene Bridge and Fluorines

占空比升高时氧化硅桥键所占比例持续增加。

The proportions of Si-O-Si bridge bonds enhanced while the duty cycle increasing .

四原子中心桥键联苯酯类液晶的合成与性质

Synthesis and properties of the biphenol ester liquid crystals containing four unit linking groups

并对中心桥键对介晶性的影响进行了讨论。

The effect of central - bridge - bond on the mesophase behavior was discussed .

分子中含-CH2O-桥键液晶化合物的结构和相变间关系

Relation between Structure and Function of Liquid Crystal Compounds with CH 2O Inter ring Linkage

硫&硫桥键的振动谱带在505cm~（-1）。

The band of theS & S band is at 505cm ~ ( - 1 ) .

桥键烷基酚及其衍生物用于合成橡胶防老剂的研究进展

Research progress in antioxidant of bridged alkyl phenols category and its derivates used for synthetic rubber

腐植酸桥键结构的研究

Bridge structure of humic acids

通过变换不同的∏桥键，可以改变染料的吸收光谱范围。

The absorption spectral range of the dye can be changed by varying the type of ⅱ bridge .

分析表明，溶剂吡啶主要作用于煤基本结构单元芳核的侧链和桥键。

The results show that pyridine mainly acts with the side chains and bridge of basic unit in coals .

结果过氧桥键是青蒿素类化合物的活性中心，在Fe2+影响下过氧键逐渐裂解，两个氧原子与Fe2+以共价键结合形成环状加成产物。

Results The peroxide bridge is the active center of QHS and induced by ferrous iron to produce cyclic product .

首先对比类似有机物的氧化性，说明煤分子中易低温氧化的基团是非芳香结构中的某些烷基侧链、桥键和含氧官能团，从而得到煤分子表面的七种活性基团；

First , according to the contrast analysis of groups in the on the surface coal molecule , the seven active groups is got .

通过一系列模型化合物证明芳香核间的脂肪链桥键至少在定性上可以用臭氧化法研究。

Through a series of model compounds , it is proved that short aliphatic bridge between two aromatic nuclei can be determined at least qualitatively by ozonization .

桥键的长度对液晶的形态也有明显的影响，具有较长桥键的二介晶化合物倾向于只显示胆甾相。

The effect of spacer on mesophase morphology is very dependent upon the length . It was found that the dimer with longer spacer tend to exhibit N only .

来源于配体的两个羧基螯合Pr3+形成两个四元环。其它四个羧基通过桥键连接中心离子。

Two carboxyl groups from ligands chelate Pr 3 + ion to form two four membered rings , and the rest four carboxyl groups bridge the metal ion center .

结果表明：作为电子给体化学反应的活性点主要是羟基氧原子或羟基桥键氧原子，作为电子受体化学反应的活性点主要是六配位的Al。

Results show that the hydroxyl oxygen or the hydroxyl bridged oxygen is the electron donating reactive zone , while the six coordinated Al acts as an electron accepting center .

以n-乙基咔唑作为供电子基团，氰基乙酸为拉电子基团，通过变换不同的∏桥键来合成。

We use N-ethyl carbazole as the electron donating group , and the cyanoacetate as the electron-withdrawing group , connecting the two parts together by converting different II bridge bonds .