查询词典 bidentate

The oxygen atoms of the carboxylate group were coordinated with the rare-earth ion in bridging bidentate mode.

推测出羧基中的氧原子以桥式双齿的形式与稀土离子配位。

The influences of the inclusion of Na~+ into each conformer (C7AB, C7"AB, C7eqB, C5A, C7axB orα"B) of AD molecule on the Ramachandran angles of molecular backbone and the hydrogen bonds in AD moiety were discussed in detail. It was found that in the forming process of bidentate structures of Na~+-AD ion-complexes, the original H-bonds in AD molecule were fully broken down, accompanying with the new formation of the two Na-O bonds.

论文中详细探讨了Na~+-AD络合离子六种构象的空间构型，分析了丙氨酸二肽与Na~+作用过程中AD分子骨架Ramachandran角及分子内N(1)–H(1)…O(2)、N(2)–H(2)…O(1)、N(1)–H(1)…N(2)和N(2)–H(2)…N(1)氢键的变化，研究发现Na~+与AD分子形成双齿结构时，AD骨架中原先的氢键全部被破坏，继而形成了两个新的Na-O键；Na~+与AD分子形成单齿络合离子时，AD骨架中原先的氢键或者得到增强或者断裂之后出现新的强度更大的氢键。

The new method combined the use of two DNA probes whose sequences comprises the whole complementary strand to the target DNA, in which one probe was labeled with an EDTA-〓 complex on the 5'-terminus and the other, labeled with a bidentate β-diketone on the 3'-terminus.

该法测定目标DNA的最低检测下限为6 pM，比现有其它均相DNA杂交分析法低2-3个数量级。该法具有简单、快速和高灵敏度等优点，通过使用各种的标记DNA探针，预计该法可广泛应用于各种实际DNA样品的分析。

"In chelates, the ligand attaches at more than one point, sharing more than one electron pair, and is called bidentate or polydentate-having two or many " teeth .

在螯合物里，配位体连接在不止一个点上，它们共享一个以上电子对，称为「双齿配位体」或「多齿配位体」，表示说有两个或许多个「牙齿」。

In the fourth chapter, four new complexes of hydrazide of podophyllic acid with transition metals have been prepared. Elemental analysis, molar conductivity, IR,〓 NMR and TG-DTA were used to characterize them. The results show that general formula of the complexes is M〓(n=0 or 2). The ligand is linked through the carbonyl oxygen and the terminal nitrogen of the hydrazide base to the transition metal ions in bidentate mode.

第四章 合成了四种鬼臼酰肼的过渡金属配合物，通过元素分析、摩尔电导、红外光谱、核磁共振氢谱和热重-差热对配合物进行了表征，研究结果表明，配合物的组成为M〓（n=0或2），配体是通过羰基氧和肼基上的端氮以双齿形式与金属离子配位的。

The Molar conductivity indicates that all the complexes are nonelectrolyte. IR spectra show the ligand is bonded with RE ion through its oxygen atom in hydroxyl group of phenol; NO3 is coordinated as a symmetrical chelating bidentate group; the coordinated atoms of DMF and DMSO are the oxygen atoms in carbonyl and sulfoxyl groups. Fluorescence spectrum suggests that the Tb3+complexes have characteristic luminescence and its fluorescence intensity is enhanced after doping with La3+, Gd3+, Y3+, influence of doping ions and neutral ligands have also been discussed.

摩尔电导率表明，所有配合物均为非电解质；红外光谱及核磁共振氢谱表明，对叔丁基杯[8]芳烃通过酚羟基的氧原子与稀土离子配位；硝酸根为双齿螯合配位；DMF和DMSO则分别通过羰基氧和亚砜基氧与稀土离子配位；配合物的荧光光谱表明，所有Tb的配合物具有较强的特征荧光，掺杂La~(3+)、Gd~(3+)、Y~(3+)离子对Tb~(3+)的荧光有较强的增强作用。

The calculated results show that the X3+ cations each has two stable structures: the regular trigon(D3h) and the line with the regular trigon(D3h) being the ground state, while for three neutral X3Cl clusters, Sc3Cl has three stable isomers: the trigon-pyramidal(C3v), bidentate(C2v-1), and C2v-2 structures, Y3Cl and La3Cl each has only two stable isomers: the trigon-pyramidal(C3v) and bidentate(C2v-1) structures.

计算结果表明，三个X3+阳离子有两个稳定异构体：正三角型(D3h)和线型，其中正三角型为基态；对于三个中性的X3Cl团簇，Sc3Cl 有三个稳定的异构体：三角金字塔型(C3v)、双齿型(C2v-1)和 C2v-2型（图 1 e）；Y3Cl 和 La3Cl有2个稳定的异构体：三角金字塔型(C3v)和双齿型(C2v-1)。

It is considered that the carboxylic groups coordinate to the metal ions in four modes: monodentate, the chelating bidentate, the bridging bidentate, and thebridging-chelating tridentate.

一般认为羧酸基有四种配位方式：单齿、螯合双齿、桥联双齿和螯合桥联三齿。

Four bidentate NS ester ligands, two bidentate NS amide ligands, tridentate MBPA and tetradentate BMBPA ligands have been synthesized.

合成了四种含有酯基的NS二齿配体-CYE系列物，两种含有酰胺基的NS二齿配体，三齿配体MBPA和四齿配体BMBPA。

O disturbed nickel carbonyl hydride species, monodentate formate species and bidentate formate species are possible intermediates in the methanation of CO〓, the bidentate formate speciea is most stable.

在CO〓加氢反应过程中，可能生成O扰动Ni羰基氢化物、单齿甲酸盐类和双齿甲酸盐类物种，后一物种能量最低。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。