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関連する概念動画

The Photochemical Reaction Center01:29

The Photochemical Reaction Center

4.4K
Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
4.4K
The Antenna Complex01:15

The Antenna Complex

6.4K
Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
6.4K
Photosystem I01:27

Photosystem I

65.6K
Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
65.6K
Photosystem II01:22

Photosystem II

73.8K
The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
73.8K
Colors and Magnetism03:02

Colors and Magnetism

12.5K
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...
12.5K
Photoluminescence: Applications01:14

Photoluminescence: Applications

517
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
517

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関連する実験動画

Updated: Oct 6, 2025

IridiumIII Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II
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IridiumIII Luminescent Probe for Detection of the Malarial Protein Biomarker Histidine Rich Protein-II

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光反応性鉄 (II) コンプレックス・ルミノフォール

Wolfgang Leis1, Miguel A Argüello Cordero2, Stefan Lochbrunner2

  • 1Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, 72076 Tübingen, Germany.

Journal of the American Chemical Society
|January 13, 2022
PubMed
まとめ

この研究は,光からエネルギーへの変換のための新しい鉄 (II) 複合体を導入します. この発光色素は,三重金属からリガンドへの電荷移転状態を特徴とし,合成のための効率的な近赤外線放射と光反応性を示しています.

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Purification of Active Photosystem I-Light Harvesting Complex I from Plant Tissues
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科学分野:

  • 写真化学
  • 無機化学
  • 材料科学

背景:

  • 光をエネルギーに変換するには 興奮状態を制御することが重要です
  • ルテニウム複合体は一般的な敏感剤ですが,代替品が求められています.

研究 の 目的:

  • 新しい発光と光反応性鉄 (II) 複合体を報告する.
  • 光駆動合成における興奮状態の性質と潜在的な応用を調査する.

主な方法:

  • フェニルフェナントロリン枠組の二重サイクロメタラテッド鉄 ((II)) コンプレクスの合成.
  • 発光衰退と興奮状態のリドックスポテンシャルを含む光物理学的性質の特徴.
  • ラジカル・クロスカップリング反応での使用の実証.

主要な成果:

  • 鉄 (II) 複合体は,金属からリガンドへの電荷移転 (3MLCT) 状態を最も低いエネルギーで満たしている.
  • 異なる相での寿命は1~2. 4ns,77Kでの寿命は14nsであった.
  • 複合体は,MLCT興奮状態の2V対Fc/Fc+の酸化還元電位を示している.
  • 4-クロロブロムベンゼンとベンゼンの根性交配に成功した.

結論:

  • 開発された鉄 (II) 複合体は,ルテニウム複合体と同様の高性能感受剤である.
  • NIR発光とリドックスポテンシャルを含む好ましい興奮状態の特性により,光駆動合成で使用できます.
  • この研究は,持続可能な化学変換のための金属ベースの染色体の範囲を拡大します.