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関連する概念動画

Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

8.0K
During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
8.0K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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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...
513
EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

654
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...
654
Protein Buffers in Blood Plasma and Cells01:20

Protein Buffers in Blood Plasma and Cells

1.2K
The human body utilizes protein buffer systems to maintain a stable pH. These systems capitalize on the dual role of amino acids, which can act as acids or bases by accepting or releasing hydrogen ions in response to pH changes. Protein buffer systems are particularly significant in the extracellular fluid (ECF) and intracellular fluid (ICF) of active cells, where structural and functional proteins provide substantial buffering capacity.
Certain amino acids can exist in a zwitterion state at a...
1.2K
Formation of Complex Ions03:45

Formation of Complex Ions

23.9K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.9K
Buffers: Overview01:30

Buffers: Overview

4.7K
Buffers play a crucial role in stabilizing the pH of a solution by mitigating the effects of small amounts of added acid or base. They consist of a weak acid and its conjugate base or a weak base and its conjugate acid. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl (aq).
4.7K

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Updated: Aug 29, 2025

Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides

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単核Cu複合体に基づく4H+/4e電子結合プロトンバッファ

Tong Wu1, Khashayar Rajabimoghadam2, Ankita Puri1

  • 1Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania15213, United States.

Journal of the American Chemical Society
|September 9, 2022
PubMed
まとめ

この研究では,銅とリドックス活性リガンドを用いた新しい4H+/4e-電子結合プロトンバッファ (ECPB) システムが導入されました. このECPBシステムは,酸素還元と有機基板脱水反応を効果的に触媒化する.

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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

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Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase
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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase
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Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase

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科学分野:

  • 無機化学
  • 電気化学
  • カタリシス

背景:

  • 効率的な電子結合プロトンバッファ (ECPB) システムの開発は,触媒アプリケーションにとって極めて重要です.
  • リドックス活性リガンドを持つ銅基複合体は,マルチ電子転送プロセスに有望な経路を提供します.

研究 の 目的:

  • 銅とリドックス活性リガンドを基にした新しい4H+/4e-ECPBの設計と特徴付け.
  • 酸素還元と有機基板脱水におけるECPBシステムの触媒的活動を調査する.
  • 結合反応と分離反応の両方でECPBの機能を制御するメカニズム的経路を解明する.

主な方法:

  • 銅複合体の合成と特徴付けは,X線 difraktion, 1H-NMRスペクトロスコーピーを使用しています.
  • ECPBシステムのリドックス反応を調査する電気化学的研究.
  • 電子構造と反応機構を理解するための密度関数理論 (DFT) の計算.

主要な成果:

  • Cu (I) / Cu (II) に基づく4H+/4e-ECPB (複合体1) とリドックス活性ビス (urea) リガンドが成功して合成され,特徴づけられました.
  • ECPBシステムは,O2からH2Oへの4H+/4e- 還元のための触媒的活性を示した.
  • このシステムは,結合された状態と分離された状態の両方で有機基質の脱水化も触媒化しました.
  • 機械学的研究により,ECPBの均衡を維持する急速な不均衡反応が明らかになった.

結論:

  • 開発されたCuベースのECPBシステムは,マルチプロトンおよびマルチ電子転送反応を媒介するための効率的なプラットフォームを提供します.
  • 酸素還元と有機脱水の両方を触媒化するシステムの能力は,様々な触媒応用におけるその可能性を強調しています.
  • 分離および結合反応経路は,酸化および還元プロセスに対する調整可能な制御を提供します.