配位

In all those complexes, no matter which conformation IDA assumes (mer- or fac-style), the two 0 atoms of 1N2O are both from carboxylic hydroxyl. However, by comparing the bond length, we can find that O(4) and O(2) atom is from different group in this complex, 0(4) atom from carboxylic hydroxyl, whereas, 0(2) from carboxylic carboxide.

值得注意的是：在这个双核配合物中，我们首次发现一种新颖的配位方式：IDA上与金属离子配位的三齿螯合原子是亚氨N原子、一个羧基上的羟基O原子和另外一个羧基上的羰基O原子。

The results show that the bonds between the coordinate waters and the Mg atom have certain extent covalent character.

结果表明Mg原子与配位水分子之间的配位键具有共价键性质。

Crystal structural analysis reveals that, because water molecules bond to Cu atoms, the dhbd ligand can only adopt a hydroxyl oxygen atom to bridge two reversed U-shaped subunits into a novel centrosymmetric dual-U-shaped tetranuclear Cu structure. Each U-shaped frame consists of two crystallographically distinct Cu atoms, two dpphen ligands and one coordinated water molecule.

晶体结构分析表明，由于水的配位阻断， 2，3-二羟基丁二酸根仅通过单羟基氧桥联两个U形双核亚单元形成具有一个对称中心的双U形四核结构，其中U型亚单元包含晶体学上不对称的2个Cu原子、1个2，3-二羟基丁二酸根、2个4，7-二苯基-1，10-邻菲咯啉和1个配位H2O分子。

This is the first example of two-dimensional lanthanide MOFs with one dimensional water chains.2、Coordination polymer[Nd_2_3(H_2O)_2]·bpy·4H_2O(2)(bpdc=2, 2′-bipyridine-3,3′-dicarboxylate,bpy=4,4′-bipyridine)had been synthesized under hydrothermal conditions and its structures were determined by X-ray diffraction,and confirmed by IR and TG analysis.

该结构是在二维骨架的镧系配位聚合物中首次观察到的一维的水链结构。2、以Nd_2O_3，2，2′-联吡啶-3，3′-二羧酸和4，4′-联吡啶为原料，采用水热法合成了一个具有二维骨架结构的配位聚合物[Nd_2_3(H_2O)_2]bpy·4H_2O，通过IR、x射线单晶衍射分析和热重等手段对其结构进行了表征。

Nevertheless, its fluorescence is enoughintense to be investigated the switch properties in aqueous solution. 5. The results of fluorimetric titrations and spectrophotometric titrations indicate that,for 〓 and 〓, fluorescence of fluorenyl was quenched by transfer of electron from metalcenter to photoexcited state of fluorenyl during coordination of Cu or Ni.

在酸性条件下，未配位的〓和〓都有荧光，在中性及弱碱性条件下与金属铜、镍离子配位后，发生光诱导电子转移，电子由金属离子中心转移至激发态的芴基而使其荧光猝灭。

Quadridentate Titanium was detected in the samples with 5% at the low temperature. However, absorption peak of Sexadentate Titanium was not detected at the high temperature. it might not be detected by IR Spectra because of too little Titanium phase.

结果表明，未添加的样品中主要检测到的是硅氧链的变化；添加5%的样品，低温检测到有四配位的钛存在，但是高温时却未检测到六配位的钛离子的吸收峰，这可能是由于生成的含钛晶相太少，红外光谱未能敏感的检测到。

Through cyclic hydrogen bonding with motif formed by coordinated water molecules and coordinated hydroxyl groups of dhbd from adjacent tetranuclear units, these adjacent neighbors are connected to afford a 1D supramolecular chain along axis a, which is further extended via aromatic intercalations and other crystallization water molecules into a 3D structure with channels.

毗邻的四核单元通过配位H2O分子和配位羟基O原子形成的 R 22(8)型环形氢键桥的连接，沿a轴方向构建了四核单元交替相连的一维超分子链；链间籍苯环的π-π堆积作用和晶格水分子氢键链的连接进一步扩展为具有隧道的三维结构。

By comparing the catalytic behavior of S3/MAO and S8/MAO, a conclusion could be drawn that the coordination of the sulfur atom to the titanium center of the active species was essential for ethylene trimerization.

通过比较S3与S8不同的催化性能，可以认为，硫原子对钛活性中心可能存在配位，而这一配位对乙烯三聚反应起重要作用。

One mixed-ligand complex ofnH2Otpa=terephthalate, tripy=4'-(4methyoxyphenyl-2,2':6',2-terpyridine was synthesized and characterized by IR, elemental analysis and thermo-gravimetric analysis. The crystal structure of the product was established by single-crystal X-ray diffraction.

采用水热法合成了新的维链状锌的配位聚合物nH2O（tpa=对苯二甲酸，tripy=4'-（4-甲氧基苯基）－2，2'：6'，2-三联吡啶），通过红外光谱和元素分析对该配位聚合物进行了结构表征，用X射线单晶衍射测定了晶体结构。

Fluouricil is usually used as anticancer drug, its derivative, 5-fluoro-uracil-1- acetic acid has good biological activity. Its complexes were presented in literatures. However, the coordination modes of it are paradox in literatures. The single crystal structure was resolved to clarify the confusion. The result indicates the carboxylic group coordinates to zinc ion in unidentate, and the heteroatoms of pyrimidine ring are not involved in coordination. Antitumor activity against SMMC-7721 was also examined.

7.5-氟尿嘧啶是临床上广泛使用的抗癌药物，它的衍生物5-氟尿嘧啶-1-乙酸亦具有良好的生物活性，有关它的金属配合物亦有报道，但其结构指认相当混乱，为此研究了它与锌的配合物单晶结构，证明了5-氟尿嘧啶以单齿羧基与锌配位，而嘧啶环氮并未配位，也研究了它对SMMC-7721细胞株的抗肿瘤作用。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。