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関連する概念動画

Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

725
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
725
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

22.0K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
22.0K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

570
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
570
Structure of Amines01:19

Structure of Amines

2.8K
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’...
2.8K
Acid Halides to Amides: Aminolysis01:07

Acid Halides to Amides: Aminolysis

3.2K
Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
3.2K
Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

6.3K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
6.3K

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関連する実験動画

Updated: Oct 12, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

Published on: December 29, 2016

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アミン添加による2D半導体金属有機カルコゲノラートのサイズと品質の向上

Watcharaphol Paritmongkol1,2, Tomoaki Sakurada2, Woo Seok Lee2,3

  • 1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

Journal of the American Chemical Society
|November 22, 2021
PubMed
まとめ

研究者らは,2D金属有機カルコゲノラート (MOC) のサイズと品質を大幅に向上させ,次世代技術での使用を推進する新しい化学方法を開発しました.

さらに関連する動画

Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures

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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework

Published on: April 9, 2018

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関連する実験動画

Last Updated: Oct 12, 2025

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
10:42

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV

Published on: December 29, 2016

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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework
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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 固体化学

背景:

  • 二次元 (2D) 材料は高度な技術にとって不可欠ですが,しばしば小さなサイズと欠陥に苦しんでいます.
  • 2D金属有機カルコゲノラート (MOC) は,ユニークな光学特性を持つハイブリッド半導体の有望なクラスです.

研究 の 目的:

  • 2D MOCのサイズと結晶の質を改善するためのスケーラブルな方法を開発する.
  • アミン添加物がMOC合成を促進するメカニズムを調査する.
  • 新しい2D MOCを合成するメソッドの汎用性を実証する.

主な方法:

  • シルバーアミン複合体の形成を含む溶液成長法.
  • 顕微鏡を用いた結晶の大きさと質の特徴づけ
  • 光学特性を評価するための光発光スペクトロスコーピー.
  • 機械学的研究のための核磁気共振 (NMR) 光譜 (77Se NMR)

主要な成果:

  • 銀フェニルセレノラート (AgSePh) のマイクロ結晶の平均サイズを<5μmから>1mmに増加させました.
  • 光発光寿命の延長とミッドギャップ放射の減少は,結晶の質の改善を示しています.
  • MOC形成におけるアミンの二重な役割:中間物質の促進と反応速度の抑制.
  • 新型2DMOCの合成された単結晶,シルバー4-メチルフェニルセレノラート (AgSePhMe).

結論:

  • 2D MOC合成におけるサイズと品質の制限を効果的に克服します.
  • この方法は,技術的なアプリケーションのための高品質の2D MOCへのスケーラブルな経路を提供します.
  • この発見は,特異な性質を持つ新しい2D MOC 材料の開発への道を開きます.