基本释义:

正离子

网络释义

1)positive ion,正离子

2)cation,正离子

3)Carbonium ion,正碳离子

4)carbenium ion,正碳离子

5)carbocation

[,kɑ:b?'kei??n],碳正离子

6)Radical cation,正离子基

用法和例句

The results show that the formation of dry gas is abided by reaction mechanism involving the cleavage of pentacoordinated Carbonium ion which is formed by the protonation of alkanes over acidic catalyst.

结果表明,烷烃分子首先在催化剂酸性中心作用下发生质子化反应,烷烃分子链上易受到氢质子进攻的位置一般在其叔碳原子或碳链中心碳原子附近的C—H键或C—C键处,形成两种反应过渡态物种——五配位正碳离子H-Carbonium和C-Carbonium。

Reaction trends of catalytic desulfurization of thiophene were determined based on the reaction energy needed, which was obtained with the AM1 calculation results of thiophene and possible carbonium ions on transition state.

采用半经验AM1计算方法 ,利用静态理论对噻吩在分子筛催化剂上的催化裂化脱硫机理进行了量子化学计算研究 ,通过对噻吩分子和可能产生的中间正碳离子的量子化学计算 ,得到各中间反应所需的能量 ,从而判断噻吩催化裂化脱硫反应的趋势 ,证实了氢转移反应在催化裂化脱硫中所起的作用 。

Their adsorption rate on the molecular sieve catalysts surface and the stability of their carbonium ions were then obtained based on the molecular simulation on these molecules from their dipole moment, 2-dimensional electrostatic potential energy contours and 3-dimensional electrostatic potential energy isosurface.

采用半经验的AM1量子化学计算方法和静态理论 ,分别考察了噻吩、 3 甲基噻吩和 2 ,5 二甲基噻吩分子结构特性的不同 ,从偶极矩、各自垂直于芳香环平面的二维电势能分布曲线和整个分子周围三维电势能分布情况等方面分析了它们在分子筛催化剂表面吸附速度的快慢和生成正碳离子稳定性的高低 ,进一步比较了噻吩及其衍生物所生成的正碳离子进一步反应的能量变化 ,从而可判断噻吩及其衍生物裂化脱硫速度的快慢 ,噻吩及其衍生物裂化脱硫的速度由大到小分别为 :2 ,5 二甲基噻吩、 3 甲基噻吩、噻吩。

In the area of acid-catalyzed reactions,the most of hydrocarbon-converted reactions,such as fluid catalytic cracking,isomerization,alkylation and dimerization,are carried out according to the mechanism of carbenium ion reaction.

正碳离子是有机化学反应过程中一种活泼的反应中间体,对于它的研究已经有100多年的历史。

Reaction of ferrocenylphenylcarbinol with ethereal solution of boron trifluoride in dichloride methane formed the relevant ferrocenylphenylmethyl carbocation.

二茂铁基苯基甲醇与三氟化硼-乙醚溶液在二氯甲烷中作用,形成二茂铁苯基甲基碳正离子。

The reaction of ferrocenyl ethylferrocenyl methanol with BF3 in CH_2Cl_2 gave the relevant monoalkylated diferrocenyl carbocations .

(二茂铁基、乙基二茂铁基 )甲醇与BF3在二氯甲烷中作用 ,形成相应的双二茂铁甲基碳正离子 ,无需从反应混合物中分离出来 ,该离子便可与正丁胺作用得到标题化合物 ,由元素分析、红外光谱确认了该化合物的结

These methanols were treated with BF 3 in CH 2Cl 2 to generate the diferrocenylmethyl carbocations.

它们对酸的敏感性很高 ,与BF3 在二氯甲烷中作用可形成稳定的二茂铁基甲基碳正离子 ,无需从溶液中分离出来 ,便可与胺RNH2 [R =C2 H5,n C3 H7,n C4H9,HOCH2 CH2 ,HOCH(CH3 )CH2 ,HOCH2 CH(C2 H5) ]作用得到产率颇高的二茂铁基胺 。

Positive ions drift downward, negative ions drift upward.

正离子向下漂移，负离子向上漂移。

In the region where the corona exists, large numbers of positive and negative ions are formed.

在存在电晕的区域，形成了大量正离子和负离子。

In some way, positive and negative ions are developed in a thunderstorm.

在雷雨中，正离子和负离子以某种方式形成。

Measurement of the Stability of a Ba~+ Ion Frequency Standard

钡正离子频率标准稳定度的测量(英文)

THE TEACHING STUDY OF REACTIVE INTER-MEDIATE-CARBONIUMIONS;

有机活性中间体—碳正离子的教学研究

The positive and negative ions become separated or dissociated.

正负离子彼此分开或解离。

a positively charged atom of hydrogen; that is to say, a normal hydrogen atomic nucleus.

带正电的氢离子，即常态的氢原子核。

A molecule carrying both a positive and a negative charge.

两性离子带有正负电荷的分子

Linear Dispersion Relation for Electron-positron Plasma in Relativistic Regime

相对论正负电子对等离子体色散关系

Having only one metal ion or positive radical.

只有一个金属离子或正基的

As the brother and sister were about to rise from the table, there came a knock at the door.

正在兄妹俩要离开桌子时，有人敲门。

Applying equally to both positive and negative ions.

双极性的等同地适用于正负离子的

A true electrolyte consists of ions in the pure state.

真正的电解质在纯态下由离子组成。

An Analysis of the Finite Word Length Effects on Orthonormal Discrete Wavelet Transform

正交离散子波变换有限字长效应分析

Study on the Characteristics and Structures of Cathode Materials LiCo_xNi_(1-x)O_2 for Lithium Ion Battery;

锂离子电池正极材料LiCo_xNi_（1-x）O_2的研究

Synthesis and Characterization of LiMn_2O_4 as Catho de Materials for Lithium Ion Batteries;

锂离子电池正极材料LiMn_2O_4的合成与表征

Study of LiFePO_4 as Cathode Material for Lithium-Ion Battery;

锂离子电池正极材料LiFePO_4的制备与改性

Preparation and Modification of LiNiO_2 Cathode Material for Lithium-ion Batteries;

锂离子电池正极材料LiNiO_2的制备与修饰