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相关概念视频

Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Molecular Structure and Acidity02:34

Molecular Structure and Acidity

An acid can be deprotonated to form a conjugate base or an anion. If the produced anion is more stable, then the acid is stronger. On the contrary, if the anion is unstable, then the acid is weaker. Hence, to determine the acidity of the compound, the stability of its conjugate base is studied using various factors.
The size effect explains the change in atomic size on acidity. When comparing the acids formed from elements that belong to the same column in the periodic table, their atomic sizes...
Ions as Acids and Bases02:54

Ions as Acids and Bases

Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
π Molecular Orbitals of the Allyl Cation and Anion01:18

π Molecular Orbitals of the Allyl Cation and Anion

An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with an...
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous overlap of p...
Preparation of Acid Anhydrides01:07

Preparation of Acid Anhydrides

One of the methods for preparing symmetrical or unsymmetrical acid anhydrides involves the treatment of acid chlorides with the sodium salt of carboxylic acids. The reaction proceeds via a nucleophilic acyl substitution.
The carboxylate ion acts as a nucleophile that attacks the carbonyl carbon of the acid chloride to form a tetrahedral intermediate. Subsequently, the re-formation of the carbonyl group with the loss of the chloride ion as a leaving group leads to the formation of an acid...

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相关实验视频

Updated: Jun 26, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

在CN7中,离子是...

Thomas M Klapötke1, Jörg Stierstorfer

  • 1Department Chemistry and Biochemistry, Energetic Materials Research, Ludwig-Maximilian University of Munich, Butenandtstr. 5-13, D-81377 Munich, Germany. tmk@cup.uni-muenchen.de

Journal of the American Chemical Society
|January 1, 2009
PubMed
概括
此摘要是机器生成的。

研究人员合成了新型的高四醇盐,具有作为主要爆炸物的潜力. 在已知的四醇盐中,Hydrazinium azidotetrazolate的含量是最高的,这表明它具有能量特性.

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Determination of the Gas-phase Acidities of Oligopeptides
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid

Published on: January 25, 2020

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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
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Published on: July 27, 2018

Determination of the Gas-phase Acidities of Oligopeptides
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Determination of the Gas-phase Acidities of Oligopeptides

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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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科学领域:

  • 无机化学 无机化学 有机化学
  • 材料科学 材料科学 材料科学
  • 能量材料 能量材料

背景情况:

  • 新能源材料的合成对于各种领域的进步至关重要,包括推进剂和爆炸物.
  • 醇衍生物以其高含量和作为能量化合物的潜力而闻名.

研究的目的:

  • 为了合成和表征来自5-azido-1H-tetrazole的新能量盐.
  • 评估这些盐的特性,重点关注它们的含量,灵敏度和能量性能.

主要方法:

  • 脱化5-azido-1H-tetrazole以形成各种阿齐多特拉酸盐.
  • 使用低温单射线衍射,红外和拉曼光谱,多核核核磁共振,质谱和差分扫描热度计的特征.
  • 敏感性测试 (冲击,摩擦,电火花) 和量子力学计算 (CBS-4M) 用于形成热量,引爆特性和特定冲动.

主要成果:

  • 几种新型的阿齐多特拉酸盐已成功合成和特征化.
  • 在已知的四醇盐中,Hydrazinium azidotetrazolate (2) 的含量是最高的 (87.48%).
  • 盐2,3,4和5具有主要爆炸性特征,其计算的形成热量与引爆压力和速度相关.

结论:

  • 合成的阿齐多特拉酸盐代表了一种新型的高能能量材料.
  • 酸酸四酸盐显示出异常的含量和作为主要爆炸物的潜力.
  • 该研究为先进的能量化合物的设计和应用提供了有价值的数据.