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関連する概念動画

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...
Catalysis02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...

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関連する実験動画

Updated: Jun 8, 2026

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
12:08

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Published on: June 24, 2022

アロステリック上分子三層触媒

Hyo Jae Yoon1, Junpei Kuwabara, Jun-Hyun Kim

  • 1Department of Chemistry and the International Institute for Nanotechnology, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3113, USA.

Science (New York, N.Y.)
|October 9, 2010
PubMed
まとめ
この要約は機械生成です。

研究者は,有機金属触媒を制御するために,アロステリック超分子複合体を開発しました. この可逆系は,触媒活動を正確にオン・オフに切り替えて,ポリマーの分子量の調節を可能にします.

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

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関連する実験動画

Last Updated: Jun 8, 2026

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
12:08

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

Published on: June 24, 2022

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10:57

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Published on: April 10, 2018

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09:34

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Published on: February 6, 2020

科学分野:

  • 超分子化学 超分子化学
  • カタリシス カタリシス カタリシス
  • ポリマーサイエンスの科学

背景:

  • 有機金属触媒は,精密な反応制御の可能性を秘めています.
  • アロステリック調節は,生物学的および化学的システムを調節するメカニズムを提供します.
  • 制御可能な触媒活性を持つ合成システムの開発は,重要な課題です.

研究 の 目的:

  • オーガノメタリック触媒を制御するためのアロステル性超分子構造の設計と合成.
  • 小分子とアニオンによる超分子複合体の可逆的な開閉を調査する.
  • このシステムの適用が ε-カプロラクトンのリング開きポリメリゼーションを調節する際の効果を実証します.

主な方法:

  • モノメタリック触媒部位をカプセル化した三層の超分子複合体の合成.
  • 小分子と元素アニオン (例えば,塩化物) をエフェクタとして使って,複雑な組み立てと分解を制御する.
  • ポリメリゼーションおよびエフェクタ追加/削除中に,リアルタイムで触媒活動を監視します.
  • ポリマーの分子量と分散性の特徴.

主要な成果:

  • 埋もれた触媒部位を使って,超分子複合体が成功裏に構築されました.
  • 複合体は,クロライドイオンの存在または欠如によって制御される可逆的な開閉を証明しました.
  • ε-カプロラクトンのリング開きポリメリゼーションは,複合開き時に開始され,閉塞時に停止されました.
  • 触媒活性は,複数のオン/オフサイクルの後も高いままであり,ポリマーの分子重量が効果的に調節されました.

結論:

  • 有機金属触媒に対するアロステリック制御は,超分子構造を用いて達成可能である.
  • この可逆系は,触媒プロセスに対する正確な時間および活動制御を提供します.
  • 開発された方法は,ポリマー合成と分子量の調節のための新しい戦略を提供します.