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相关概念视频

Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.2K
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
2.2K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.9K
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.
2.9K

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相关实验视频

Updated: Jan 9, 2026

Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties
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Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

Published on: January 8, 2016

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刺激反应的光酸多电解质

Carlo Gericke1, Edmondo M Benetti1, Barbara Fresch2

  • 1Laboratory for Macromolecular and Organic Chemistry, Department of Chemical Sciences, University of Padova, via Marzolo 1, Padova, 35131, Italy.

Angewandte Chemie (International ed. in English)
|December 10, 2025
PubMed
概括
此摘要是机器生成的。

螺旋烯聚合物在水中呈现出因光引起的pH值变化. 它们的成分控制光酸性,使得强大的光与质子能量转换装置成为可能.

关键词:
墨氨酸光酸的光酸.分子开关是分子开关.光酸性 光酸性聚电解质是一种多电解质.斯皮罗皮兰斯 (Spiropyrans) 是一个有机生物.

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Optical Control of Living Cells Electrical Activity by Conjugated Polymers
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Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process
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Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process

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相关实验视频

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科学领域:

  • 聚合物化学 聚合物化学
  • 摄影化学的使用.
  • 材料科学 材料科学 材料科学

背景情况:

  • 螺旋聚合物表现出不同的刺激反应行为.
  • 螺旋聚合物在水性介质中的光酸特性尚未得到充分研究.

研究的目的:

  • 合成和研究含有spiropyran的聚电解质共聚合物.
  • 了解这些共聚合物在水中的光酸性质和水解稳定性.

主要方法:

  • 合成聚3-硫甲酸) kopo 聚合物与螺旋单元.
  • 在水溶液中描述共聚合物的行为.
  • 研究光引起的质子解离和pH值波动.

主要成果:

  • 聚合物构成增强了质子化梅洛氨酸单元的水解稳定性.
  • 聚合物组成允许对光酸度进行编程.
  • 暴露于光线会诱导可逆质子解离,导致pH值波动高达3个单位.

结论:

  • 螺旋共聚合物在水性环境中提供可调节的光酸性.
  • 这些材料显示了光到质子能量转换应用的潜力.