查询词典 atom

For the first tin atom, it appears to be seven-coordinated with a distorted pentagonal bipyramid geometry, and the other is five-coordinated with a distorted trigonal bipyramidal geometry.

其中一类锡原子呈七配位畸变五角双锥构型，另一类呈七配位畸变三角双锥构型。

Bipyridyl and 1,10-phenanthroline (L3), Cl3SnCH2CH2COORo L (L= L1, a; L2, b; L3, c), formed by low-heating solid-state reaction. The crystal structures of 1 and 2 show that the tin atom adopts a distorted trigonal bipyramid geometry via intramolecular carbonyl oxygen to tin coordination [the distances of Sn-0 bond are 0.2351(6) ran for 1 and 0.2362(3) nm for 2]. Compound 1 belongs to monoclinic with space group P2/c, a = 0.9842(2) nm, b =1. 0923(8) nm, c = 1.23948(11) nm,/?= 93.894(15)°, V= 1.3294(4) ran3, Mr = 366.23, 7 = 4. Compound2 belongs to monoclinic with space group P2{/c, a = 1.04443(9) nm, b = 1.04823(7) nm, c = 1.28113(9) nm,/= 90. 953(8)°, V= 1.40239(19) nm3, Mr = 380.25, Z = 4

利用元素分析、红外光谱、核磁共振对其结构进行了表征，并通过X射线单晶衍射测定了1和2的晶体结构，二者均为具有分子内羰基氧原子配位的畸变三角双锥结构。1属于单斜品系，空间群P21/c， a=0.9842(2)nm，b=1.0923(8)nm，c=1.23948(11)nm，β=93.894(15)°，V=1.3294(4) nm^3，Mr=366.23，Z=4.2属于单斜晶系，空间群P21/c，a=1.04443(9)nm，b=1.04823 (7)nm，c=1.28113(9)nm，β=90.953(8)°，V=1.40239(19)nm^3，Mr=380.25，Z=4。

The copper atom changed six-coordinate in a distorted octahedral configuration to five-coordinate in a distorted trigonal bipyramidal configuration.

在2个配合物中，金属Cu的配位数都由前体中的6转变为5，由原来前体中的畸变的八面体结构转变成畸变的三角双锥结构。

The Xray diffraction analysis of the compounds (3) and (4) shows the presence of an intramolecular coordination of oxygen to the tin atom giving rise to a fivemembered ring in which the metal exhibits a distorted trigonal bipyramidal geometry.

并通过X-射线衍射测定了（3）和（4）的晶体结构，其空间群均为P2〓/c，晶胞内分子数Z=4，分子结构是以锡原子为中心金属原子、含分子内O→Sn配位键五员环的扭曲三角双锥结构，碳碳双键的两个氢是顺式构型。

The results indicated that the Sn atom in bistin Schiff base complexes was five-coordinated in trigonal bipyramidal geometries thanks to the existence of intermolecular ligands of Sn←N.

Schiff碱具有良好的配位作用，它们与不同的有机锡化合物配位后可以形成形式多样、结构不同的配合物，而且Schiff碱具有多种生物活性，与有机锡化合物生成配合物后，配合物的生物活性可能更宽广。

Unsuccessful results were observed in the Pd/C and PPh3 catalyst system due to phenyl boronic acid containing electron-withdrawing F atom.

在Pd/C及PPh3的催化体系下，由于反应物含有吸电子F原子的苯硼酸，没有观察到偶联反应的发生。

Pd(PPh3)4 is more reactive for boronic acids with steric hindered F atom and no self-coupling by-product, and coupling reactions gave good yields of 90% and 91%.

Pd(PPh3)4对于含有位阻F原子苯硼酸的偶联反应很具有活性，且没有自偶联产生，产率可达90%及91%。

Pd(PPh3)4 was more reactive for boronic acids with sterically hindering F atom, and the coupling reactions gave good yields of 90% and 91% without any self-coupling by-product.

Pd(PPh3)4对于含有位阻F原子苯硼酸的偶联反应很具有活性，且没有自偶联产生，产率可达90%及91%。

Comparing with the photodissociation of bromobenzene, the extra fluorine atom of fluorobenzene accelerates the rate of the internal conversion from the state to the state, and the different positions on the phenyl ring also have distinct effect on it.

与溴苯相比，氟溴苯上的氟原子显著加快了解离的速度，并且氟原子在苯环上的位置的不同对解离速度也有显著影响。

The framework Al atom was located in the channel intersection when TPA salt and 1, 6-hexanediamine was used as templates whereas the Al atoms can located both in the channels and channel intersections with butylamine or ethylenediamine as template.

当以TPA季铵盐和己二胺为模板剂时，骨架Al原子处于分子筛孔道交叉位置上，证实了文献中关于ZSM-5的酸中心处于孔道交叉处的说法。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。