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相关概念视频

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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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.1K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.1K
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...
63.2K
Photosystem II01:22

Photosystem II

71.4K
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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Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

6.1K
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.4K
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.
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相关实验视频

Updated: Jul 26, 2025

Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch
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Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch

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高效的基于氧化的分子光开关.

Daniel Doellerer1, Daisy R S Pooler1, Ainoa Guinart1

  • 1Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands.

Chemistry (Weinheim an der Bergstrasse, Germany)
|June 22, 2023
PubMed
概括

3 - 乙烯 - 印度林 - 2 - 是一种新型的光开关. 这些化合物表现出强大的光化学切换与高量子产量,显示生物应用的潜力.

关键词:
分子光开关是分子光开关.氧醇是一种氧醇.摄影化学 摄影化学量子收益率是指量子的收益率.可见光 可见光 可见光.

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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles
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科学领域:

  • 有机化学 有机化学
  • 摄影化学的使用.
  • 药用化学 医学化学

背景情况:

  • 氧化异环,特别是3-化-化-2-,因其显著的药物相关性和多种生物医学应用而得到认可.
  • 尽管对这些化合物的生物特性进行了广泛的研究,但这些化合物的光化学活性仍然在很大程度上未被探索.

研究的目的:

  • 为了研究3-乙烯-印林-2-的光化学性质.
  • 为了将这些化合物确立为新型光开关的一类.
  • 探索它们对生物应用的潜力.

主要方法:

  • 合成3 - - 乙烯 - - 印度林 - 2 一衍生物.
  • 光化学表征,包括产量确定和量子产量测量.
  • 评估光化学开关的稳定性.

主要成果:

  • 3-乙烯-印林-2-被成功合成,产量很高.
  • 这些化合物表现出强大的光化学切换能力.
  • 光化学切换的量子产量达到了50%.

结论:

  • 3-乙烯-印林-2-代表了一类有前途的可光切换分子.
  • 它们的高光化学效率和强度表明,它们在各种应用中,包括生物系统中,有很大的发展潜力.