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相关概念视频

The Antenna Complex01:15

The Antenna Complex

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...
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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.
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory organs,...
Catenins01:23

Catenins

Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the adherens...

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Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells
14:37

Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells

Published on: November 5, 2014

一个可光开关的 [2]catenane受体.

Jorn de Jong1, Maxime A Siegler2, Sander J Wezenberg1

  • 1Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands. s.j.wezenberg@lic.leidenuniv.nl.

Chemical communications (Cambridge, England)
|January 15, 2025
PubMed
概括

一种新型的基受体使用光来切换Z和E异构体,改变结合. 这种光异构化使客户按需吸收和释放,用于先进的分子应用.

科学领域:

  • 超分子化学 超分子化学
  • 摄影化学的使用.
  • 材料科学 材料科学 材料科学

背景情况:

  • 连锁体是机械互锁的分子架构,具有独特的特性.
  • 光响应材料提供了对分子功能的动态控制.
  • 在生物和化学系统中,化物传感和运输至关重要.

研究的目的:

  • 开发一种可光切换的化物离子受体.
  • 为了研究光异构化对客体结合亲和力的影响.
  • 为了展示客人按需的吸收和释放,使用光.

主要方法:

  • 一个 [2]catenane受体的合成功能与一个刚性-stilbene单元.
  • 使用340/385nm光线对 stilbene 单元进行光异构.
  • 化物结合研究,以评估亲和力变化.

主要成果:

  • 在光照照射时,连体受体可逆地在Z和E异构体之间切换.
  • 光异构化导致化物结合亲和力的显著变化.
  • 该系统允许控制,在现场的客 () 吸收和释放.

结论:

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  • 基受体的光诱导异构化提供了一个可调化结合的机制.
  • 这种可光切换系统展示了对受控分子识别和运输应用的潜力.