异常高的两个光子吸收横截面在金状的迪亚扎-比提奥芬衍生物
Gabriel Sauter1, Antonia Papapostolou2, Audrey Pollien1,3
1Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 253, 69120, Heidelberg, Germany.
Angewandte Chemie (International ed. in English)
|March 26, 2025
概括
这项研究揭示了新型异构基中异常大的两光子吸收 (2PA) 截面. 这些发现突显了它们对先进光学应用的潜力.
科学领域:
- 材料科学 材料科学 材料科学
- 量子化学 是一个量子化学.
- 光电学是指光电子产品.
背景情况:
- 对于先进的光学材料来说,二光子吸收 (2PA) 是至关重要的.
- 有机染色体正在被探索它们的2PA特性.
- 异种基具有独特的电子结构.
研究的目的:
- 为了研究 (azaacene-annulated) 异基的2PA特性.
- 为了将分子结构与2PA截面相关联.
- 为了阐明强大的2PA背后的机制.
主要方法:
- 协同实验和理论分析.
- 在广泛的光谱范围内测量2PA截面.
- 量子化学计算以阐明机制.
主要成果:
- 观察到异常大的2PA截面,在850-950nm范围内高达51770GM.
- 在1400-1600nm范围内发现了显著的2PA截面 (高达4100GM).
- 实验发现得到了量子化学计算的支持和解释.
结论:
- 研究的异类因子对于它们的分子大小来说表现出了出色的2PA性能.
- 高振荡器强度和与激发状态的合驱动着大型2PA横截面.
- 接受者-π-捐赠者-π-接受者图案促进了强大的2PA和最佳的分子对齐.
更多相关视频
相关概念视频
Aryldiazonium Salts to Azo Dyes: Diazo Coupling
2.9K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
2.9K
UV–Vis Spectroscopy: Woodward–Fieser Rules
23.5K
UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given...
23.5K
Photochemical 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
UV–Vis Spectroscopy of Conjugated Systems
6.8K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent...
One of the factors influencing λmax is the extent...
6.8K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
9.9K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
9.9K
Aromatic Hydrocarbon Cations: Structural Overview
2.6K
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...
2.6K


![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)