基于有机的光色凝器
Tongtong Zhang1, Zhenhui Zhao1, Xiaodong Yin1
1Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 102488, P. R. China. nanwang@bit.edu.cn.
Chemical communications (Cambridge, England)
|June 4, 2024
概括
研究人员使用-联体开发了光活性超分子凝. 紫外线改变了凝结构,影响了质性质,但没有破坏自组装结构.
科学领域:
- 超分子化学 超分子化学
- 材料科学 材料科学 材料科学
- 有机化学 有机化学
背景情况:
- 已经合成了四坐标-酸联合体.
- 有机化合物可以表现出光色特性.
- 超分子凝是通过自我组装形成的.
研究的目的:
- 通过将光色有机单元纳入凝器中,制造光活性超分子凝.
- 研究紫外线照射引起的结构变化对这些凝的自我组装结构和质性质的影响.
主要方法:
- 合成四坐标-酸联合体.
- 高分子凝的形成.
- 紫外线辐射研究.
- 测量风病学性质.测量风病学性质.
- 自组装系统的结构分析.
主要成果:
- 添加光色有机单元成功地将光活性传递给了超分子凝.
- 紫外线辐射诱导了凝分子的结构转变.
- 这种结构转变对凝的整体自组装结构的影响最小.
- 然而,超分子凝的风湿性质受到UV辐射的显著影响.
结论:
- 可使用光色有机-联体来制造光响应的超分子凝.
- 凝器中的光学诱导的结构变化可以被利用来调整凝的宏观性质,特别是它们的风质.
- 这些发现为开发具有可调节的机械特性的光敏材料开辟了道路.
相关概念视频
01:26Photochemical Electrocyclic Reactions: Stereochemistry
1.8K
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
1.8K
03:08Hydroboration-Oxidation of Alkenes
8.1K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
8.1K
02:36Regioselectivity and Stereochemistry of Hydroboration
8.1K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
8.1K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
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.
2.3K