分子

The title compound C_(27)H_(23)FN_(4)O_(2)C_(2H_(5)OH was obtained by the reaction of 1-phenyl-3-methyl-5-pyrazolone with 2-fluorobenzaldehyde in ethanol in the presence of piperidine under microwave irradiation and recrystallization from ethanol.

标题化合物C27H23FN4O2(C2H5OH)是由2分子1-苯基-3-甲基-5-吡唑啉酮和1分子2-苯甲醛微波辐射4 m in，用乙醇重结晶得到。

The planarity and the average degree of the bond of the initiators are discussed by the full-matrix least-squares on F〓.

通过最小二乘法计算结果，讨论了分子的平面性及键长平均化程度，诠释了分子内电荷转移的趋势及有可能的引发机理。

Pakistani officials say security forces plash with militants near the Afghan border Saturday,leaving 16 militants and two soldiers dead.

巴基斯坦官员说安全部队星期六在阿富汗边境附近和武装分子发生冲突，造成16名武装分子和两名士兵死亡。

In complex 1,Cucan be described as a four-coordinated square planar geometry.Compound 8 is the sodium salt of plumbagin and exists as ionic compound.Compounds 9-16 are the rare earth complexes of plumbagin with La,Y,Dy,Sm,Gd,Nd,Erand Eu.Compound 17 is binuclear Y complex.18 is mononuclear Ycomplex with plumbagin and another ligand from Plumbago Zeylanica.Compounds 19-21 are the ternary complexes with plumbagin and 2,2\'-bpy and phen as assistant ligand.In 19, the geometry of Cucan be described as five-coordinated distorted square pyramid that exists in a dimer through the weak bonding,and 1-D chain structure is formed by intermolecular hydrogen bonds.

化合物1的单晶结构分析表明1具有四配位平面四边形结构，化合物8是白花丹素的Na盐，以离子化合物形式存在；化合物9～16为白花丹素的La，Y，Dy，Sm，Gd，Nd，Er，Eu的稀土金属配合物；化合物17是白花丹素的双核钇结构；化合物18为白花丹素的单核钇结构，该配合物除了含白花丹素外，还有来自白花丹植物中的另一个单体化合物也参与配位；化合物19～21是以2，2\'-联吡啶和邻菲咯啉等含N配体为辅助配体，具有白花丹素—含N配体—金属离子的三元配合物，化合物19是白花丹素和2，2\'-联吡啶与Cu的配合物，具有五配位的四方锥构型，通过Cu…O弱的成键作用形成二聚体，再通过分子间的氢键作用进一步形成一维链状结构，化合物20和化合物21是白花丹素分别与2，2\'-联吡啶和邻菲咯啉的Zn配合物，都具有六配位八面体构型的双核锌配合物，呈一维链状结构，化合物20中链与链之间的大量氢键将一维链扩展成二维层，分子间的π-π堆积作用进一步形成三维结构。

They form a polar molecule, that is, one with a slightly positive end and a slightly negative end.

它们形成一个极性分子，也就是说，一个带有微弱正电荷和微弱负电荷的极性分子。

Chemical bonds and structural theory of organic chemistry 6 class hoursKnow the history of organic chemistry; Grasp the basic theory of organicchemistry, such as structural theory, chemical bonds, resonance theory, atomic andmolecular orbital theory, and valence bond theory; understand polar and non-polarcompounds, dipole moment and know how to express the structures of organiccompounds with different molecular formulas.

了解有机化学发展简史；掌握有机化学结构理论、化学键理论、共振理论、原子和分子轨道理论和杂化轨道理论；了解极性和非极性分子并掌握有机化合物结构的表示法。

The conventional calculation models of electron displacement polarizability are summarized and their limitations are revealed.

分析了经典的电子位移极化率的计算模型，指出了这些经典模型在计算非对称双原子分子模型时存在局限性，提出了一种针对非对称双原子分子的电子位移极化率的计算模型。

However, therehas yet not been a satisfactory explaination to vibrational spectra of molecules,especially polyatomic molecules. In this thesis, we will give some discussionson this problem.

而人们对其中的分子振动光谱，尤其是多原子分子的振动谱问题还未能做出一个圆满的解释，在本文中我们就将对这一问题做一些讨论。

High resolution ro-vibrational spectroscopy is an important tool to understand the the energy-level structures and energy transfer in the studies of polyatomic molecules.

中文摘要在有关多原子分子的研究中，高分辨振转跃迁光谱是很好的了解分子能级结构和能量转移的重要手段。

The photodissociation study of the molecule CH3ONO not only provides some useful information for an understanding of the bondbreaking processes in polyatomic molecules, but also probes a wide range of dynamic interaction responsible for the dissociation of polyatomic molecules.

CH_3ONO的光解研究不但可以提供一些有用的信息来理解多原子分子的断键过程，还可以探测多原子分子解离的动力学相互作用。

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。