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相关概念视频

Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

2.8K
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
2.8K
Aromatic Hydrocarbon Cations: Structural Overview01:18

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...
2.8K
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

3.0K
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...
3.0K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.1K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.1K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

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
1.9K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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

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相关实验视频

Updated: Jul 19, 2025

Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties
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含有电子缺陷五环亚二的p型合聚合物

Qiao He1, Jessica Shaw1, Yuliar Firdaus2,3

  • 1Department of Chemistry and Centre for Processable Electronics, Imperial College London, White City Campus, London W12 0BZ, U.K.

Macromolecules
|August 14, 2023
PubMed
概括

研究人员合成了一种新的缺乏电子的五环亚齐二 (BTTA) 构建器块用于有机电子. 结合BTTA的聚合物在有机场效应晶体管和太阳能电池中实现了高性能,证明了其多功能应用.

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Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
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科学领域:

  • 有机电子学有机电子学
  • 材料科学是一种材料科学.
  • 聚合物化学 聚合物化学

背景情况:

  • 比斯提诺亚泽平 (BTA) 已知是高性能的p型合聚合物.
  • 环延长版本BTA的探索较少.

研究的目的:

  • 合成了一种新的环扩展电子缺乏的五环亚西二 (BTTA) 构建块.
  • 在有机电子应用中研究BTTA与zodithiophene (BDT) 的共聚物.

主要方法:

  • 合成的BTATA作为一个关键的构建块.
  • 制备了三种BTTA共聚合物与不同侧链的BDT单元.
  • 制造和特征有机场效应晶体管 (OFET) 和有机光伏 (OPV) 设备.

主要成果:

  • 聚合物表现出类似的能量水平和吸收,但不同的薄膜形态.
  • 在BDT (pBDT-BTTA-2) 上,最佳的OFET孔移动性达到了0.027cm2V-1s-1与基乙侧链.
  • 使用PC71BM,OPV设备的效率达到6.78%,使用BTP-eC9接受器达到13.5%.

结论:

  • 缺乏电子的BTTA单元对于高性能p型聚合物非常通用.
  • 侧链工程在BDT上显著影响膜形态和设备性能.
  • 基于BTTA的聚合物对有机电子产品显示出有前途的结果,与最先进的电子产品相美.