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関連する概念動画

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...
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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 formed in...
Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
Phase II Reactions: Miscellaneous Conjugation Reactions01:19

Phase II Reactions: Miscellaneous Conjugation Reactions

Phase II biotransformations are detoxification mechanisms that conjugate xenobiotics with endogenous substances, neutralizing their toxicity.
A key example involves the conjugation of cyanide ions, which impair cellular respiration and alter hemoglobin into non-oxygen-carrying cyanmethemoglobin. To neutralize this threat, a sulfur atom from thiosulphate is transferred to the cyanide ion, catalyzed by the enzyme rhodanese, resulting in an inactive compound called thiocyanate. The production of...

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関連する実験動画

Updated: Jul 6, 2026

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
07:20

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

Published on: May 28, 2014

高活性銅基触媒で,原子移転ラジカルポリメリゼーションを行う.

Huadong Tang1, Navamoney Arulsamy, Maciej Radosz

  • 1Soft Materials Laboratory, Department of Chemical & Petroleum Engineering, University of Wyoming, Laramie, Wyoming 82071, USA.

Journal of the American Chemical Society
|December 15, 2006
PubMed
まとめ
この要約は機械生成です。

新しい銅-TPEN触媒は,触媒濃度が大幅に低下した高度に活性な原子移転ラジカルポリメリゼーション (ATRP) を可能にします. このブレークスルーにより,最小限の触媒を用いた制御されたポリマー合成が可能になり,ポリメリゼーション技術が進歩しました.

さらに関連する動画

An Optimized Protocol for the Efficient Radiolabeling of Gold Nanoparticles by Using a 125I-labeled Azide Prosthetic Group
07:23

An Optimized Protocol for the Efficient Radiolabeling of Gold Nanoparticles by Using a 125I-labeled Azide Prosthetic Group

Published on: October 10, 2016

[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
09:12

[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

Published on: May 21, 2019

関連する実験動画

Last Updated: Jul 6, 2026

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
07:20

Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents

Published on: May 28, 2014

An Optimized Protocol for the Efficient Radiolabeling of Gold Nanoparticles by Using a 125I-labeled Azide Prosthetic Group
07:23

An Optimized Protocol for the Efficient Radiolabeling of Gold Nanoparticles by Using a 125I-labeled Azide Prosthetic Group

Published on: October 10, 2016

[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
09:12

[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

Published on: May 21, 2019

科学分野:

  • ポリマー化学のポリマー化学について
  • カタリシス カタリシス カタリシス
  • マテリアルサイエンス 材料科学

背景:

  • 原子移転ラジカルポリメリゼーション (ATRP) は通常,高濃度の触媒 (1000-10,000ppm) を要求する.
  • 高活性触媒の開発は,効率的で経済的なポリメリゼーションプロセスにとって極めて重要です.

研究 の 目的:

  • ATRPのための新しい,高度に活性な銅ベースの触媒を導入する.
  • 触媒の性能を様々なモノマーで調べ,その構造特性を調べる.

主な方法:

  • 銅 ((I) ブロミド/N,N,N,N'-テトラキス ((2-ピリジルメチル) エチレンダイアミン (CuBr/TPEN) 複合体を触媒として使用した.
  • アクリル,メタクリル,およびステレンモノマーでATRPを実行した.
  • X線 difraktionとNMRスペクトロスコピーを用いて触媒構造を特徴づけました.

主要な成果:

  • 低カタリスト/イニシアター比 (0.005と0.001) で,低ポリ分散率でよく制御されたポリメリゼーションを達成しました.
  • 銅濃度が6〜8ppmまででATRPに成功したことが実証されています.
  • 溶液中の二核と単核の銅複合体と単核の無活性化複合体との均衡を特定した.

結論:

  • CuBr/TPEN複合体は,ATRPのための汎用的で高度に活性な触媒である.
  • 高い触媒安定性と適切な均衡定数は,効率的な触媒の鍵であり,特に稀な条件下では重要です.
  • 発見は,次世代のATRP触媒の設計のための基礎を提供します.