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相关概念视频

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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The Photochemical Reaction Center01:29

The Photochemical Reaction Center

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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...
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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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Photosystems01:32

Photosystems

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Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
Functioning of Photosystems
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two 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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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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Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
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太阳能应用的新Rh2II,II复合物:泛色吸收和激发状态反应性

Tyler J Whittemore1, Hannah J Sayre1, Congcong Xue1

  • 1Department of Chemistry and Biochemistry, The Ohio State University , Columbus, Ohio 43210, United States.

Journal of the American Chemical Society
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PubMed
概括
此摘要是机器生成的。

新的轮复合体显示强烈的紫外线可见光吸收,使其成为太阳能转化和光催化应用的有希望的染料.

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科学领域:

  • 无机化学
  • 材料科学
  • 摄影化学

背景情况:

  • 轮复合物以其独特的电子和光物理特性而闻名.
  • 尤其是复合物,因为它们的催化和光采集能力引起了人们的兴趣.
  • 开发用于太阳能转换的新材料需要具有可调节性能的高效吸光器.

研究的目的:

  • 合成和表征新型异构轮复合物.
  • 研究这些复合物的光物理和电化学特性.
  • 评估它们作为太阳能转化和光催化剂的潜力.

主要方法:

  • 合成和表征cis-[Rh2(μ-form) 2 ((μ-np) 2) [BF4]2和cis-Rh2 ((μ-form) 2 ((μ-npCOO) 2) 复合物.
  • 紫外线-Vis吸收光谱以确定光吸收配置文件.
  • 超快速和纳秒短暂的吸收和时间分辨率的红外光谱,以研究激发状态的动态.
  • 能量转移灭实验以估计三重激发状态的能量.
  • 电化学方法来确定氧化还原潜力.

主要成果:

  • 已经成功合成和表征了四种新的异构轮复合物.
  • 复合体具有强大的泛色光吸收从紫外线到可见区域 (高达640nm).
  • 观察到单体和三体金属/配体对配体电荷转移 (ML-LCT) 激发状态.
  • npCOO-复合体显示红移吸收到近红外线,并经历光启动的电子转移.
  • 三重激发状态能量范围从1.83到0.78 eV,具有确定的氧化还原潜力.

结论:

  • 这些新复合体代表了一类新的吸光器.
  • 它们的广泛吸收和有利的激发状态特性使它们适合太阳能应用.
  • 潜在的应用包括在太阳能电池中注入电荷的染料和光催化剂.
  • 这些复合体在紫外线辐射到大约800nm时有效工作.