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関連する概念動画

Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

5.3K
Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
5.3K
Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview01:16

Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview

4.4K
Primary amines react with carbonyl compounds—aldehydes and ketones—to generate imines. Imines consist of a C=N double bond and are named Schiff bases after its discoverer—the German chemist Hugo Schiff. On the other hand, secondary amines react with carbonyl compounds to give enamines. In enamines, the presence of a C=C double bond adjacent to the nitrogen atom leads to the delocalization of the lone pair.
4.4K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

2.7K
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...
2.7K
Structure of Amines01:19

Structure of Amines

2.5K
The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
2.5K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.7K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
2.7K
Structural Isomerism02:34

Structural Isomerism

19.1K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.1K

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関連する実験動画

Updated: Jun 5, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

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単純に思えるイミン結合の共性有機構造を調査する

Cailing Chen1, Li Cao1, Yaozu Liu2

  • 1Physical Science and Engineering Division (PSE), Advanced Membranes and Porous Materials (AMPM) Center, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.

Journal of the American Chemical Society
|December 12, 2024
PubMed
まとめ

先進的なイメージングにより,共性有機フレームワーク (COF) は複雑で不均一な毛穴構造を持ち,既存のモデルに挑戦しています. この発見は,COFの構造と触媒と分離におけるその応用を再評価する必要がある.

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Author Spotlight: Characterizing Porous Materials for Aiding the Development of Robust Metal-Organic Frameworks with Adsorption Behavior
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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Synthesis and Characterization of Functionalized Metal-organic Frameworks

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関連する実験動画

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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Author Spotlight: Characterizing Porous Materials for Aiding the Development of Robust Metal-Organic Frameworks with Adsorption Behavior
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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科学分野:

  • 材料科学
  • 化学について
  • ナノテクノロジー

背景:

  • 協和有機フレームワーク (COF) の構造的決定は,通常,粉末X線微分法 (PXRD) に基づいています.
  • COFの限られた結晶性は,しばしば低信頼性の構造モデルにつながります.
  • 現存する2DイミンベースのCOFのモデルは,均一な六角形の毛穴を想定しています.

研究 の 目的:

  • 広範囲に研究された2DイミンベースのCOFの実際の構造を,リアルスペース画像を用いて調査する.
  • COFの毛孔の均一性についての従来の理解に挑戦する.
  • COFおよびその誘導体のより正確な構造モデルを確立する.

主な方法:

  • リアルスペース画像 (例えば,伝送電子顕微鏡)
  • 相互空間特徴 (PXRDなど)
  • 固体核磁気共振 (ssNMR) スペクトロスコーピー
  • 密度関数理論 (DFT) の計算

主要な成果:

  • リアルスペース画像では 異なる形状と大きさの2つの異なる毛穴が明らかになり 均一な六角形の毛穴の仮定と矛盾しています
  • 新しい構造モデルが確立され,層内と層間構成で従来のモデルと異なる.
  • COFの機能に影響を与える,以前に認識されていない欠陥構造が特定されました.

結論:

  • この画期的なCOFの構造は,これまで考えられていたよりも複雑で異質である.
  • COFの構造を正確に決定するには,高度な特徴化技術が不可欠です.
  • 特定された欠陥は,分離と触媒におけるCOFの適用に重大な影響を及ぼします.