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関連する概念動画

The Antenna Complex01:15

The Antenna Complex

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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...
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Light as Energy01:35

Light as Energy

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The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
Photons
A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit...
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The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
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Photosystem II01:22

Photosystem II

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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...
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Photosystem I01:27

Photosystem I

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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...
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MOFにおける波長依存のエネルギーと電荷移転:人工の有孔光集集システムへの一歩

Xinlin Li1, Jierui Yu1, David J Gosztola2

  • 1Department of Chemistry and Biochemistry , Southern Illinois University , 1245 Lincoln Drive , Carbondale , Illinois 62901 , United State.

Journal of the American Chemical Society
|October 1, 2019
PubMed
まとめ

この研究は,天然の光合成を模倣する金属有機フレームワーク (MOF) を使用して,人工的な光収集システムを作成します. MOFはエネルギーを効率的に転送し,電荷を分離し,高度な人工光合成の研究の道を開きます.

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科学分野:

  • 材料科学
  • 写真化学
  • 超分子化学

背景:

  • メタル・オーガニック・フレームワーク (MOF) は,ライト・ハービシング・コンプレックス (LHC) の機能をエミュレートするための調整可能なプラットフォームを提供します.
  • MOFの染色体の位置を正確に制御することは,エネルギーと電荷の移転を理解するために不可欠です.
  • 自然光採集プロセスの効率を複製するために 人工的なシステムが必要です

研究 の 目的:

  • MOF構造の中で合成光収集システムを構築する.
  • 統合された染色体間のエネルギー伝送 (EnT) と電荷伝送 (CT) のダイナミクスを調査する.
  • 自然LHCの反応センターを模倣するMOFベースのプラットフォームを確立する.

主な方法:

  • テトラフェニルポルフィリナート亜鉛 ((II) (TPPZn) を NU-1000 MOF (H4TBAPy-derived) に合成後に固定する.
  • エネルギー伝送経路を検知するために,刺激-放出マッピングを含むスペクトル分析.
  • システムの設計を導くために,基底状態と興奮状態の酸化還元電位を決定する.

主要な成果:

  • 刺激されたNU-1000 MOFからTPPZnへの効率的なエネルギー転送が観察された (k_EnT ≈ 4.7 × 10^11 s^-1).
  • 460 nmでのMOF放出の完全消火,その後670 nmでのTPPZn放出.
  • 人工的な"特殊ペア"のようなシステムの形成は,電荷分離を推進する (k_CT = 1.2 × 10^10 s^-1).

結論:

  • 機能的なMOFベースの人工光集集システムは成功裏に合成されました.
  • この研究は,波長に依存するエネルギーと電荷の移転プロセスを示しています.
  • 明確に定義されたMOF構造は,機械学的研究と将来のアプリケーションのための充電ジャンプを容易にする.