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相关概念视频

Physical Properties of Carboxylic Acid Derivatives01:19

Physical Properties of Carboxylic Acid Derivatives

2.7K
Intermolecular forces dictate several physical properties such as boiling points, melting points, solubilities, and so forth. They are classified into four types: ionic forces, hydrogen bonds, dipole–dipole forces, and dispersion forces. Ionic forces are the strongest, while dispersion forces are the weakest.
Among the carboxylic acid derivatives, the boiling points of acid chlorides and esters are very similar and are the lowest in the series. Acid anhydrides have slightly higher boiling...
2.7K
Physical Properties of Ethers02:17

Physical Properties of Ethers

7.1K
Overview
An ether molecule has a net dipole moment due to the polarity of C–O bonds. Subsequently, boiling points of ethers are lower than those of alcohols of comparable molecular weight and slightly higher than those of hydrocarbons of comparable molecular weight (Table 1).
Ethers can act as hydrogen bond acceptors, making them more water-soluble than hydrocarbons, but since ethers cannot act as hydrogen bond donors, they are much less soluble in water than alcohols. Ethers are considered...
7.1K
Types of Enols and Enolates01:19

Types of Enols and Enolates

2.7K
Aldehydes and ketones form enols, although only about 1% of the enol is present at the equilibrium for simple monocarbonyl compounds. The enol form is undetectable for acetaldehyde, present as only 1.5 × 10−4 % of acetone, and present as only 1.2% of cyclohexanone. Two kinds of regioisomeric enols are possible for unsymmetrical ketones, and their net composition is 1% at equilibrium. This instability is due to the lower bond energy of C=C than the C=O group. The additional...
2.7K
Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis01:13

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis

3.0K
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
3.0K
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview01:20

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview

18.2K
The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
18.2K
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism01:13

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism

8.0K
Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.
8.0K

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相关实验视频

Updated: Jul 17, 2025

Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy
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Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy

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埃斯特键:在化学上不稳定,但在机械上稳定

Hai Lei1,2,3, Quan Ma4, Zhangxia Wang5

  • 1Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University, Nanjing 210093, China.

ACS nano
|August 30, 2023
PubMed
概括

埃斯特键在化学上是不稳定的,但在机械上是稳定的. 这项研究表明,水解对机械力不敏感,这表明它们可以用作响应材料中的惰性单元.

关键词:
原子力显微镜的原子力显微镜.埃斯特债券是一种埃斯特债券.水解是指水解过程中的水解.机械力是一种机械力.蛋白质的展开过程单分子力光谱法 单分子力光谱法

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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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科学领域:

  • 化学工程是化学工程的重要组成部分.
  • 材料科学 材料科学 材料科学
  • 生物化学 生物化学

背景情况:

  • 埃斯特键使材料具有可降解性和响应性.
  • 机械力量对乙水解的影响还不太清楚.

研究的目的:

  • 为了研究以力为依赖的键的水解.
  • 为了确定机械力是否会影响结的稳定性.

主要方法:

  • 开发了一种单分子检测方法,使用带有中的 Ester 键的工程蛋白质.
  • 利用单分子力谱法来测量水解速率.
  • 执行量子计算以了解水解机制.

主要成果:

  • 乙水解速率对施加的力 (80-200 pN) 基本上不敏感.
  • 在测试的力量中,离合率在约7s-1保持不变.
  • 量子计算表明,速度限制步骤也对力不敏感.

结论:

  • 乙键在机械上是稳定的,尽管在化学上是不稳定的.
  • 这种机械稳定性允许设计使用以键作为惰性元件的响应性材料.