通过短暂的激进-激进相互作用进行光燃料非光异构化消耗性自我组装系统
Yulian Zhang1, Xin Liang1, Cuiqin Yang1
1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200433, China.
Angewandte Chemie (International ed. in English)
|August 5, 2025
概括
这项研究引入了一种新的光燃料消耗性自我组装系统,使用光激发激进化,避免缓慢的光异构化. 该系统将材料重新配置为螺旋式纳米纤维,提供时间控制和信息加密的应用.
科学领域:
- 系统化学 系统化学
- 超分子化学 超分子化学
- 材料科学 材料科学 材料科学
背景情况:
- 人工消散系统模仿生物,运行远离平衡.
- 当前的光驱动系统依赖光异构化,面临响应速度和完整性之间的权衡.
- 纳弗他二胺 (NDI) 衍生物正在探索对光敏感的自组装.
研究的目的:
- 开发一种非异体化,光燃料消散式自组装系统.
- 为了利用光激发的激进化作为一种替代的能量消散机制.
- 为了实现对自组装的时间控制,并探索新的应用.
主要方法:
- 通过光刺激激活二化物修饰的纳夫他林二胺 (NDI-GV) 以形成基离子.
- 通过激素相互作用驱动的同体状螺旋纳米纤维的自我组装的观察.
- 基离子被环境空气自发氧化,用于系统重置和反通路的研究.
主要成果:
- 一种基于光激发激进化的新型消耗性自我组装机制,绕过光异构化.
- 从NDI-GV基离子中形成同体螺旋式纳米纤维.
- 通过调节光参数和溶剂,对组装周期和寿命 (>10小时) 的时间控制.
- 发现了一条涉及溶剂的反通路,维持消散循环.
结论:
- 开发的系统为光驱散自组装提供了一个新的范式,与基于光异构化的方法不同.
- 该系统展示了光编程信息加密和时空模式的潜力.
- 这项工作扩大了系统化学和光驱材料转换的范围.
更多相关视频
相关概念视频
Radical Reactivity: Overview
2.2K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.2K
Radical Formation: Homolysis
3.7K
A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
3.7K
Radical Formation: Overview
2.2K
A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the...
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the...
2.2K
Radical Formation: Addition
1.8K
Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
1.8K
Radical Formation: Elimination
1.9K
Another method of radical formation is the elimination process. It is the opposite of the addition route and is driven by the instability of the radical. For example, as depicted in Figure 1, dibenzoyl peroxide yields a pair of unstable radicals upon homolysis. Given its instability, this radical spontaneously undergoes elimination via a C–C bond cleavage to form a relatively more stable phenyl radical. The mechanism involves cleavage of the bond between the α and β positions...
1.9K
Radical Reactivity: Nucleophilic Radicals
2.2K
Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
2.2K


