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関連する概念動画

Redox Reactions01:24

Redox Reactions

58.1K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
58.1K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

23.6K
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...
23.6K
Ladder Diagrams: Redox Equilibria01:30

Ladder Diagrams: Redox Equilibria

716
Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
716
Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

1.3K
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
1.3K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

1.0K
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...
1.0K
Redox Equilibria: Overview01:23

Redox Equilibria: Overview

1.5K
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
1.5K

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関連する実験動画

Updated: Jan 2, 2026

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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リドックス活性金属有機フレームワークの固体溶液アプローチ

Gavin S Mohammad-Pour, Kendrich O Hatfield, David C Fairchild

    Journal of the American Chemical Society
    |December 3, 2019
    PubMed
    まとめ

    研究者は,調整可能な導電性を持つ薄膜電極をリドックス活性金属有機フレームワーク (MOF) で開発した. この進歩は,エネルギーとセンサーのアプリケーションの改善のための充電転送の正確な制御を可能にします.

    科学分野:

    • 材料科学
    • 電気化学
    • ナノテクノロジー

    背景:

    • メタル・オーガニック・フレームワーク (MOF) は調節可能な多孔性と合成制御を提供するが,その電気化学的応用は導電性によって制限されている.
    • MOFの伝導性を体系的に調整することは,その性質をエネルギー貯蔵およびセンサー技術に統合するために不可欠です.
    • レドックス活性ペンダントはMOFのチャージ転送を容易にしますが,制御された統合は課題です.

    研究 の 目的:

    • 精密に制御された還元酸化ペンダント含有量を持つ再酸化活性MOF薄膜電極を準備するための新しい戦略を導入する.
    • レドックスペンダント濃度と,その結果発生するMOF電極の電気伝導性の関係を調査する.
    • これらのエンジニアリングされたMOF材料内の電気化学的安定性と電荷転送メカニズムを評価する.

    主な方法:

    • レドックス活性 (アルキルフェロゼン) と無活性リンクアーの割合が異なる固体溶液アプローチを用いたMOF薄膜電極の製造.
    • MOF合成の過程で,導電性を制御するために,再酸化ペンダントの含有量を体系的に調整する.
    • 導電性測定と数千回のリドックスサイクルでの安定性試験を含む電気化学的特徴付け.
    • 電荷伝送メカニズム (例えば,拡散,ジャンプ,浸透) を明らかにするための電気分析研究.

    主要な成果:

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    • MOFの薄膜電極を調節可能な再酸化伝導性で成功裏に準備した.
    • 最大電子伝導度は 1.10 mS m−1 に達した.
    • 何千もの酸化還元サイクルで優れた結晶学的および電気化学的安定性を示した.
    • 非線形拡散係数で,溶液のような拡散制御伝導性を観察した.

    結論:

    • 開発された戦略は,制御されたレドックスペンダントの組み込みにより,MOFのリドックス伝導性を微調整することができます.
    • MOF電極は堅固な安定性を示し,ジャンプと浸透モデルと一致する電荷移転を示します.
    • この研究は,電池やセンサーなどの電気化学装置のための先進的なリドックス活性MOFを設計するための新しい道を開きます.