构造和光行为S/Se-异芳香物/烯合异物[9]烯
Yuexia Dong1, Zhen Sun1, Wan Xu1
1Engineering Research Center for Nanomaterials, Henan University, Kaifeng, 475004, P. R. China.
Organic letters
|September 1, 2023
概括
合成了三种新的硫/-乙烯,显示了长寿命的毫秒光. 在固体和溶液状态下,烯的体 (+) - [9] 显示出异常的热稳定性.
科学领域:
- 有机化学 有机化学
- 材料科学 材料科学 材料科学
- 光物理学的光学物理学
背景情况:
- 烯是具有独特电子和光学特性的奇拉多环芳.
- 加入硫 (S) 和 (Se) 等异性原子可以调整这些特性,从而产生新的功能.
- 对于先进的材料应用来说,研究异构的光物理行为和稳定性至关重要.
研究的目的:
- 使用模块化组装策略合成新型硫/-异[9]烯.
- 描述合成的化合物,重点关注它们的结构,光物理和热性质.
- 评估合成的异烯的配置稳定性,特别是它们的反体.
主要方法:
- 通过组装策略的合成,将氨酸和三元合的S/Se-异芳香构建块结合起来.
- 使用单晶X射线衍射分析进行表征,以确定分子结构.
- 光物理测量以评估光辐射和寿命.
- 在高温条件下,在固体和溶液状态下进行热稳定性测试.
主要成果:
- 成功合成了三种S/Se-hetero[9]-helicenes的合成.
- 长寿命光辐射的观测,寿命在毫秒范围内.
- 证明了的高配置稳定性 (+) - [9],在300°C (固态) 和200°C (溶液) 时没有观察到降解.
结论:
- 开发的组装策略对于合成复杂的S/Se-hetero[9]helicenes.是有效的.
- 这些异烯具有有前途的光物理特性,包括长寿命的光.
- (+) - [9]的高热和配置稳定性表明在苛刻的环境中具有应用潜力.
相关概念视频
Variables Affecting Phosphorescence and Fluorescence
527
Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
527
Aromatic Hydrocarbon Cations: Structural Overview
2.8K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
Removing one hydrogen from the intervening CH2 group...
2.8K
Five-Membered Heterocyclic Aromatic Compounds: Overview
4.0K
Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
4.0K
Criteria for Aromaticity and the Hückel 4n + 2 Rule
10.7K
Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as...
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as...
10.7K
Photochemical Electrocyclic Reactions: Stereochemistry
1.9K
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
1.9K
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.
2.4K


