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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

9.5K
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...
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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
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Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

24.8K
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...
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Formation of Complex Ions03:45

Formation of Complex Ions

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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...
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Complexometric Titration: Overview00:39

Complexometric Titration: Overview

12.5K
Complexometric titration involves the formation of a complex by reacting a metal ion with one or more ligands. A visual indicator often detects the end point of a complexometric titration. It is added to the metal solution before the titration, forming a stable metal–indicator complex and imparting color to the solution. As the titration approaches the equivalence point, the excess of the added ligand displaces the indicator from the metal–indicator complex, releasing the free...
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単核非ヘム鉄 (V) -イミド複合体

Seungwoo Hong1,2, Kyle D Sutherlin3, Anil Kumar Vardhaman1

  • 1Department of Chemistry and Nano Science, Ewha Womans University , Seoul 03760, Korea.

Journal of the American Chemical Society
|June 20, 2017
PubMed
まとめ

研究者は,テトラアミドマクロサイクルリガンド (TAML) を使用して最初の単核非ヘム鉄 (V) -イミド複合体を合成した. この新しい鉄複合体は,C-H機能化と窒素移転反応においてユニークなスペクトル学的性質と反応性を表しています.

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科学分野:

  • 無機化学
  • 有機金属化学
  • バイオ有機化学

背景:

  • 単核非ヘム鉄 (V) -オクソ複合体は知られている.
  • 新しい高価鉄複合体の合成と特徴づけは,その反応性を理解するために重要である.

研究 の 目的:

  • 単核非ヘム鉄 ((V) -イミド複合体の最初の例を報告する.
  • 複合体をスペクトロスコープで特徴づけるため
  • C-H機能化と窒素移転反応におけるその反応性を調査する.

主な方法:

  • テトラアミドマクロサイクリックリガンド (TAML) を含んだ鉄のV-イミド複合体の合成.
  • 酸化状態,Fe-N結合長,Fe-N振動の決定を含むスペクトル学的特徴づけ
  • C-H結合機能化と窒素移転に焦点を当てた反応性研究.

主要な成果:

  • 最初の単核非ヘム鉄 (V) -イミド複合体,TAML (Fe) - (NTs) - (1) が成功して合成された.
  • 顕微鏡データは,S = 1/2 Fe ((V) 酸化状態,Fe-N結合長さ1.65 ((4) Å,そしてFe-N振動が817 cm−1であることを確認した.
  • 複合体1は,C- H結合機能化と窒素移転反応において反応性を示した.

結論:

  • この研究は,ユニークな構造とスペクトル学的特徴を持つ新しい鉄 (V) イミド複合体を示しています.
  • 発見は,既知の単核非ヘム鉄複合体の範囲を拡大する.
  • 証明された反応性は,この複合体の触媒用途の可能性を強調しています.