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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

9.7K
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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

3.2K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
3.2K
Colors and Magnetism03:02

Colors and Magnetism

14.6K
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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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
49.7K
Valence Bond Theory02:42

Valence Bond Theory

11.7K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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関連する実験動画

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Synthesis and Performance Evaluations of ZnCoS/ZnCdS with Twin Crystal Structure for Multifunctional Redox Photocatalysis in Energy Applications
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フタロシアニン-Sc3N@I(h) -C80複合体の双方向電子伝送能力

Olga Trukhina1,2, Marc Rudolf3, Giovanni Bottari1,2

  • 1Department of Organic Chemistry, Universidad Autónoma de Madrid , Cantoblanco, 28049 Madrid, Spain.

Journal of the American Chemical Society
|September 25, 2015
PubMed
まとめ

研究者らは,Sc3N@I(h) -C80フルレンとZn(II) フタロシアニンを用いて新しい電子ドナー-受容体組を作りました. これらの材料は,互換性のある電子伝送を示し,対等の電子性質に基づいて,電子受容体またはドナーとして作用します.

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科学分野:

  • 超分子化学
  • 材料科学
  • 写真化学

背景:

  • 電子ドナー-受容器はエネルギー変換と分子電子学にとって不可欠です.
  • フルレレンとフタロシアニンは,このようなシステムの汎用的な構成要素です.
  • 高度な材料の設計には 電子伝送の方向性を制御することが重要です

研究 の 目的:

  • N-ピリジル置換されたSc3N@I(h) -C80フルレンとZn(II) ファタロシアニンを含む新しい電子ドナー-受容体の合成と特徴付け.
  • これらの集合体内の光物理的性質と電子移動のダイナミクスを調査する.
  • フルレン基の電子移転の振る舞いを実証する.

主な方法:

  • N-ピリジル置換のSc3N@I(h) -C80およびC60フルロピロリジンの合成
  • フレロピロリジンから電子が豊富で,電子が欠けているZn (II) фтаロシアンへの軸性調整.
  • 静止状態と時間解像度のスペクトロスコーピーを含む光物理測定法.

主要な成果:

  • 電子ドナー・アセプテータ・アセンブリの準備が成功しました
  • 一組でZn (II) フォタロシアニンからSc3N@I (h) -C80への光誘導電子移転の観測.
  • Sc3N@I(h) -C80からZn(II) ファタロシアニンへの光誘導電子移転の観測
  • Sc3N@I(h) -C80構成要素における電子移転二分法の実証,その対称性によって支配される.

結論:

  • Sc3N@I(h) -C80フルレンの誘導体は,交換可能な電子受容体/ドナー行動を示している.
  • この二分法は,調整するZn ((II) phthalocyanineの電子特性によって制御される.
  • この研究は,調節可能な電子移転反応性を持つ分子材料の作成に向けた重要な一歩を表しています.