Ru-Se协调:可见光响应材料的新动态纽带
Jianxiong Han1,2, Chaoming Xie3, Yun-Shuai Huang1
1CAS Key Laboratory of Soft Matter Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, Anhui Key Laboratory of Optoelectronic Science and Technology, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, People's Republic of China.
Journal of the American Chemical Society
|August 4, 2021
概括
研究人员开发了一种新的Ru-Se光动力键,在可见光下可逆地形成和断裂,没有副作用. 这一发现可以为各种应用创造先进的响应性和可治愈性材料.
科学领域:
- 材料科学
- 超分子化学
- 摄影化学
背景情况:
- 光动态键提供动态材料特性,但往往会产生不必要的副作用.
- 现有的光动力学键在稳定性和反应控制方面存在局限性,阻碍了它们的广泛应用.
研究的目的:
- 引入一个新的Ru-Se协调键作为光动力键.
- 在可见光下证明它的可逆形成和解离, 没有副作用.
- 探索其在构建高级功能材料中的实用性.
主要方法:
- 通过与复合物的乙烯配合合成Ru-Se键.
- 在可见光照射下研究键动态.
- 对光响应性两性体,表面和聚合物凝的制造和表征.
主要成果:
- 在黑暗中形成的Ru-Se键在可见光下分离.
- 在形成和解离过程中没有观察到任何副作用.
- 在光响应的两生物,可切换的表面湿度和可逆的聚合物凝过渡中证明了应用.
结论:
- Ru-Se键代表了一种具有高稳定性和受控光响应性的新类动态键.
- 这种结合是创建响应性,可再加工和可治愈材料的多功能构件.
- 缺少副作用使得在各种环境中设计先进材料的范围扩大.
相关概念视频
03:02Colors and Magnetism
12.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.6K
01:14Photoluminescence: Applications
568
Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
568
01:26Photochemical Electrocyclic Reactions: Stereochemistry
2.0K
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
Selection Rules: Photochemical Activation
2.0K
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
2.0K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
2.0K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.6K
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.
2.6K
01:29The Photochemical Reaction Center
4.5K
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...
4.5K