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関連する概念動画

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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...
Regioselective Formation of Enolates01:33

Regioselective Formation of Enolates

As depicted in the figure below, the unsymmetrical ketones can form two possible enolates: less substituted or more substituted enolates. Usually, the thermodynamic enolates are formed from the more substituted α-carbon atom, while the kinetic enolates are formed faster by deprotonation from the less substituted position. The thermodynamic enolates have lower energy, so they are more stable. But the energy required to form kinetic enolates is less.

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関連する実験動画

Updated: Jun 24, 2026

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

ニュートラルな弱調整環境でIn+モノマーを捕獲する.

Titel Jurca1, Justin Lummiss, Tara J Burchell

  • 1Centre for Catalysis Research and Innovation and Department of Chemistry, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5.

Journal of the American Chemical Society
|March 20, 2009
PubMed
まとめ

研究者らは,最初の低価値インジウムI複合体を合成するための新しいビス・イミノ・ピリジンリガンドを開発した. このユニークなインジウム (indium) の種は,長い金属-リガンド結合と安定した電子構造を示しています.

科学分野:

  • 有機金属化学 有機金属化学
  • メイングループ化学 メイングループ化学
  • 協調化化学について

背景:

  • ビス・イミノ・ピリジン・リガンドは,協調化学における多用途の支架である.
  • 低価値メタル群のメタル複合体は,ユニークな反応性と電子特性を有しています.

研究 の 目的:

  • 新しい bis ((imino)) ピリジンリガンドを使用して,新しい低価インジウム複合体を合成し,特徴づけること.
  • 結果となるインジウム種における電子構造と結合を調査する.

主な方法:

  • インジウム複合体の合成と分離.
  • 構造分析のための単結晶X線 difraktion. 構造分析のための単結晶X線 difraktion.
  • 電子構造調査のための密度関数理論 (DFT) 計算.

主要な成果:

  • 最初の低値インジウム (indium) 複合体とビス (imino) ピリジンのリガンドの分離と特徴付け.
  • 構造分析により,異常に長いIn-リガンド結合を持つモノメリックIn ((I)) 種が明らかになった.
  • DFTの研究では,名目ドナー-受容体相互作用と,金属-リガンド軌道混合による安定化が示された.
  • また,インジウム (III) 種も成功して合成され,特徴づけられました.

さらに関連する動画

Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets
13:42

Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets

Published on: November 2, 2011

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides
07:50

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides

Published on: May 26, 2019

関連する実験動画

Last Updated: Jun 24, 2026

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets
13:42

Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets

Published on: November 2, 2011

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides
07:50

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides

Published on: May 26, 2019

結論:

  • 新しいビス・イミノ・ピリジン・リガンドは,独特の低価インジウム・イ) 複合体を効果的に安定させる.
  • 電子構造は,観測された長い金属-リガンド結合と,In (I) センターの反応性の低下を説明する.
  • この研究は,低価値メタルメイングループ化学とリガンド設計の範囲を拡大します.