配体

Therefore heteronuclear Cu-Ln compounds have commonly been synthesized with hetero-donor ligands comprising two types of ligating atoms coordinated each to Cu and Ln atoms, respectively.

因此通常用含有能分别和铜，稀土配位的两种配位原子的配体来合成异核Cu-Ln配合物。

The alkaline-earth metal complexes with mucic acid was successfully prepared via gel formation and characterized by elemental analysis,FT-IR measurements.

结果表明，粘液酸的两个羧基和四个羟基均能参与配位键的形成，而中心离子 Ca~(2+)、Sr~(2+)、Ba~(2+)与配体粘液酸的配位状况存在着一定差异。

The macrocyclic polyamines are a kind of excellent ligands and have a substantially high binding affinity with transition metal ions. Macrocyclic polyamine metal complexes as enzyme models are widely used in chemical biology, medicine and gene therapy. 1, 4, 7, 10-tetrazacyclododecane is a representative macrocyclic polyamines compound and shows high binding affinity with transition metal ions, such as Zn, Cu and Co. Their metal complexes especially multinuclear complexes were widely used in DNA, RNA recognition.

大环多胺化合物是一类性质独特的优秀配体，具有良好的金属配位能力，其金属配合物作为人工酶模型广泛应用于核酸结构及功能研究、基因表达与调控、抗癌药物的研制等生物、化学和医学领域。1，4，7，10-四氮杂十二烷是典型的大环多胺化合物，对过渡金属离子Zn， Cu and Co有良好的配位能力，这些金属配合物特别是多核金属配合物被广泛应用于DNA识别中。

In order to investigate the effects of thecomposition and structure of the conductive coordinative polymolecular compounds on theirconductivity,we choose the functional organic molecules that can form stable free-radicalions as the ligands,investigate the coordinative bridging interaction of the transition metals orrare earth ions with the ligands and the compositions and properties of the complexes.It willprovide scientific basis for the development and application of new conductive materials.

为了探讨和总结导电性配位高分子化合物的组成及结构与化合物导电性能的关系和规律，我们选择了能形成稳定自由基离子的功能性有机小分子化合物作为配体，研究它们与过渡金属离子及稀土离子的配位桥联作用以及有关配合物的组成和性质，从而为新型导电材料的开发和应用提供科学依据。

In complex 2, the manganese ion is six-coordinated by two oxygen atoms and two nitrogen atoms from a quadridentate ligand Lb. as well as one oxygen atom from DMF and one cyanide nitrogen atom from [Fe3] (superscript -) in axial positions.

化合物2中，[Fe3]通过其中的1个氰基与桥联，其中Mn离子为六配位，分别和四齿配体Lb的2个氧原子和2个氮原子、DMF的1个氧原子及[Fe3]中的氰基氮原子配位。

N-(2-hydroxyethyl) salicylaldimine is coordinated in tridentate coordination mode. The coordinated atom of the ligand includes oxygen of hydroxybenzene, oxygen atom of hydroxyethyl, and nitrogen atom of imine.

配体N-（2-羟乙基）水杨醛亚胺以三齿方式配位，其配位原子包括酚羟基氧原子，醇羟基氧原子和亚胺基氮原子。

It was found that the central metal ion is located at the symmetric center of the molecule. Four oxygen atoms from two H2O molecules and two 〔C6H4(CO2)2〕2- groups are coordinated with copper ion to form a similar planar square coordination configuration. There is one only unidentate coordination bond between O(1) in 〔C6H4(CO2)2〕2- and Cu2+.

结构分析发现，中心金属离子位于分子的对称中心位置，铜离子与来自2个水分子和2个邻苯二甲酸根中的4个氧原子形成近似正方形平面配位，邻苯二甲酸根是以1个O(1)与Cu2+离子形成单齿配体，O(2)和Cu2+之间没有形成配位键。

In the coordination polymer,with the formates as space linkers,two types of copper centers are joined together to form three-dimensional frameworks.

在该配位聚合物中，通过甲酸根作为连接配体将两种铜配位中心连接起来形成三维网状框架结构。

It is noteworthy that there are a lot of hydrogen bond interactions between carboxy groups and water molecules and weak C-H…S hydrogen bonds between the 1,3-dithiocyclohexyls of two adjacent DYM ligans.

另外，在此配位聚合物中，羧基氧、配位水分子氧和晶格水分子氧之间存在大量氢键相互作用，而且，相邻 DYM 配体的 1，3-二硫环已基之间存在弱的 C-H…S 氢键相互作用。

The complexes were characterized by elemental analysis,UV,IR,TG,NMR and molar conductance measurements.Their formulas were in accordance with C34H32O8N2LnCl·nH2O or 〔(L4)2LnCl·nH2O,Ln=Nd,n=4;Ln=Pr,Yb,n=2;Ln=Sm,Eu,Dy,n=1〕.All the water molecules were uncoordinated.Dinuclear complexes were observed in the coordination environment.The coordination number of central ions was nine.

经元素分析、红外光谱、紫外光谱、核磁共振谱、质谱、摩尔电导、差热热重分析确证结构，其化学式为C34H32O8N2LnCl·nH2O，简写为：(L42LnCl·nH2O，Ln=Nd，n=4；Ln=Pr，Yb，n=2；Ln=Sm，Eu，Dy，n=1；该类配体是以酚氧原子、亚氨基的氮原子、桥联的羧基氧原子以及氯原子同稀土离子配位，形成了九配位的双核配合物。

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。