查询词典 anion

The crystal structure analyses of 5-7 reveal that the position of the substitutive second metal in the Keggin anion plays an important role in the structures of the compounds.

其中，5、6和7的单晶结构分析表明Keggin型杂多酸阴离子上单取代的位置对化合物的结构有着较大的影响。

Two special structural features of the sulfonium salt were proved to stabilize its corresponding ylide and depress the 2,3-sigma rearrangement. One is that there is a trimethylsilyl in the end of the allylic double band. This silicon atom can stabilize a α-carbon anion and the corresponding ylide. Another is that there is hydroxy group in the beta-position of sulfonium atom. The oxygen of this hydroxy group may stabilize the sulfonium cation.

为了稳定生成的烯丙基硫叶立德，并抑制它的2， 3-sigma 重排反应，在硫叶立德结构上做了两方面的考虑：一是在烯丙基双键的未端引入硅基，利用硅原子对 a -碳负离子的稳定作用来稳定烯丙基硫叶立德；二是在硫原子的 b -位引入羟基，利用羟基氧对硫正离子的作用来稳定硫叶立德。

Methods:Alkaline dimethyl sulfoxide system was established for producing superoxide anion.

在各种病理因子作用下，机体产生大量自由基依然是造成脑缺血再灌注损伤的重要途径。

Objective: To establish a new method for quantitative detection of inorganic anion in water including fluoride, chlorite, bromate, chloride, nitrite, bromide, sulfuret, chlorate, sulfite, nitrate, phosphate, sulfate. Methods: Ion chromatography was applied.

目的：建立能同时测定生活饮用水中F、ClO2、BrO3、Cl、NO2、Br、S(上标 2-)、ClO3、SO(上标 2-下标 3)、NO3、PO(上标 3-下标 4)、SO(上标 2-下标 4)等12种无机阴离子的方法。

Among the dose studied, the damage of peroxynitrite induced is more serious than that of superoxide anion radicals.

在研究的剂量范围内，过氧亚硝基阴离子的这种毒性作用明显大于超氧阴离子自由基。

Fig. 56. Superoxide anion scavenging effect of compounds…………………….76

图56。化合物的超氧自由基捕捉能力

The mechanism of the reaction was studiedin detail,in which excited state avaliable to carryout the excited state intramolecular proton transferreaction was recognized.The INDO/S-CI semiempiricalMO method was used to calculate transition energiesand oscillator strength,and assign spectra theore-tically,the calculated spectra values were basicallyconsistent with the experimental values.Themolecular orbital properties for the adjacent HOMO-LUMO of various kinds of conformersand anion species,thetransition properties and symmetry for thetransition from ground state to lower excited stateswere analysed,especially,no much study on theanion species all of the world.

位能曲线的求法满足反应坐标是反应过程中能量最小途径的定义，较详细地研究了各类反应的质子转移历程，认定在哪个激发态有利于发生激发态分子内质子转移反应，用INDO/S-CI半经验MO方法进行跃迁能和振子强度计算及光谱的理论指认，计算的光谱值和实验值基本吻合，并分析了各种异构体和阴离子的HOMO-LUMO附近的轨道性质，各跃迁态的跃迁性质和对称性，尤其是对阴离子的研究国内外尚不多见。

The anion of tungstotantalate was synthesized for the first time as K_9TaW_(11)O_(40)·15H_2O by the reaction of soluble potassium tantalate and porous white tungstic acid in aqueous solution.

在五氧化二钽基体中加五氧化二铌配成标准溶液，与氟钽酸钾样品在相同条件下经系列处理后进行纸上色层分离，分离后与样品直接进行目视比色。

The tetrahedral coordination of Fe in the anion can be seen from its ESR and〓 NMR spectra.

二、合成并表征主族元素B和Si作为中心原子的钛原子取代的12系列钨杂多配合物。

The title compound,(C6H6N3)(subscript 4)[Mo8]H2O, crystallizes in the triclinic system with Pī space group, the asymmetry unit of which is composed of one [Mo8](superscript 4)-anion, four protonate benzotriazolium organocations and a lattice water.

化合物(C6H6N3)4[Mo8]H2O的晶体结构属于三斜晶系的P1空间群，其不对称单元由1个[Mo8](上标 4-)，4个质子化的苯并三唑有机阳离子C6H6N3和1个结晶水组成。

I was up all night because I was in pain, she said.

我整夜，因为我在疼痛，她说。

A crow caws /craoks.

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