在捐赠-接受器替代的p-和m-C2B10H12碳酸中,光学诱导的电荷转移
Lin Wu1, Marco Holzapfel2, Alexander Schmiedel2
1Frontiers Science Center for Flexible Electronics (FSCFE), Shaanxi Institute of Flexible Electronics (SIFE) & Shaanxi Institute of Biomedical Materials and Engineering (SIBME), Northwestern Polytechnical University (NPU), 127 West Youyi Road, Xi'an, 710072, China.
Nature communications
|April 8, 2024
概括
双面碳酸作为芳香桥起作用,促进光学功能染色体中的分子内电荷转移. 它们的结合程度取决于替代扭转角,由实验和计算研究证实.
科学领域:
- 有机化学 有机化学
- 材料科学 材料科学 材料科学
- 摄影化学的使用.
背景情况:
- 冰式碳酸 (C2B10H12) 以其芳香性而闻名,但它们在与替代剂结合中的作用仍在争论中.
- 碳酸作为先进材料和分子设备的潜在构建模块.
研究的目的:
- 为了研究元和碳酸作为光学功能色谱体中的桥梁的结合程度.
- 在捐赠-接受系统中,将碳桥与传统的烯桥进行比较.
主要方法:
- 五秒秒短暂吸收光谱法
- 时间分辨率光光谱学.
- 宽带光上升转换 宽带光上升转换
- 量子化学计算 量子化学计算
主要成果:
- 实验数据证实,通过carborane桥,捐赠体和接受体群体之间存在强烈的分子内电荷转移 (ICT).
- 吸收和排放过程受到碳化合物集群的电子特性显著的影响.
- 量子化学计算显示,ICT效率取决于捐赠者和接受者组的扭曲角度.
结论:
- 双面碳酸有效调解电荷转移,支持它们在联系统中的作用.
- 通过carborane桥梁进行的电子通信可以通过替代体定向进行调.
- 碳烯为设计新型光学功能材料提供了烯的有希望的替代品.
相关概念视频
Carbocations
11.2K
Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
11.2K
π Molecular Orbitals of the Allyl Cation and Anion
4.2K
An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
4.2K
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
Regioselectivity 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
Radicals: Electronic Structure and Geometry
4.0K
This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
4.0K
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3
6.0K
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...
6.0K


