在可见光下,以形式驱动的激发状态的烯-二甲基兰氨酸衍生物在可见光下的质子化
Kumar Dineshkumar1, Muniappan Kalipriyadharshini2,3, Masiyappan Karuppusamy2,3
1Centre for Advanced Organic Materials (Sona-AROMA), Department of Chemistry, Sona College of Technology, Salem, Tamil Nadu, 636 012, India.
Chemistry, an Asian journal
|August 13, 2025
概括
基链长度影响有机染色体光化学. C6链的长度优化了中一种新的光诱导反应,通过电子转移和抽象形成质子N,N-dialkylaniline.
科学领域:
- 有机化学 有机化学
- 摄影化学的使用.
- 频谱学是一种光谱学.
背景情况:
- 有机染色体的特性取决于芳香核和替代剂.
- 链通常由于诱导效应较弱而具有较小的影响.
- 研究基链对光物理和光化学性质的影响至关重要.
研究的目的:
- 合成用N,N-dialkylanilines替代的烯,其基链长度不同 (C2,C6,C10).
- 探索基链长度对这些化合物的光物理和光化学行为的影响.
- 阐明特定溶剂中因光引起的变化的机制.
主要方法:
- 苏苏基合器用于合成pyrene-N,N-dialkylaniline衍生物.
- Solvatofluorochromic研究,以分析与溶剂极性的光转移.
- 紫外线-Vis吸收光谱和纳米秒短暂吸收光谱用于研究反应机制和中间体.
- 使用蓝色LED进行光化学辐射实验.
主要成果:
- 观察到溶解物染色,除了由于结合而导致的型溶剂和甲醇等原性溶剂的例外.
- 蓝色LED照射在甲中诱导了一种光敏感的转变,产生质子化N,N-dialkylaniline.
- 反应机制包括光激发,单电子转移和从中提取,通过短暂吸收光谱检测得到确认.
- 反应动力学取决于基链长度,C6表现出最佳的性能.
结论:
- 与一般预期相反,基链长度显著影响光化学反应性.
- 形式作为一个质子源在一个独特的光诱导反应,涉及烯-N,N-二甲基兰衍生物的作用.
- C6基链长度代表了这个特定的光化学转换的最佳配置.
更多相关视频
![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
相关概念视频
01:26Photochemical 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
01:11ortho–para-Directing Activators: –CH3, –OH, –NH2, –OCH3
6.3K
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
6.3K
01:15Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene
8.6K
Chlorination and bromination are important classes of electrophilic aromatic substitutions, where benzene reacts with chlorine or bromine in the presence of a Lewis acid catalyst to give halogenated substitution products. A Lewis acid such as aluminium chloride or ferric chloride catalyzes the chlorination, and ferric bromide catalyzes the bromination reactions. During the bromination of alkenes, bromine polarizes and becomes electrophilic. However, in the bromination of benzene, the bromine...
8.6K
01:12Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.2K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.2K
01:25Basicity of Heterocyclic Aromatic Amines
6.3K
Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
6.3K
01:14π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
1.3K
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
1.3K