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相关概念视频

Halogenation of Alkenes02:46

Halogenation of Alkenes

15.8K
Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
15.8K
Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene01:15

Electrophilic Aromatic Substitution: Chlorination and Bromination of Benzene

8.2K
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...
8.2K
Radical Substitution: Allylic Bromination01:27

Radical Substitution: Allylic Bromination

5.1K
In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formed when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperatures to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be achieved using N-bromosuccinimide...
5.1K
Formation of Halohydrin from Alkenes02:41

Formation of Halohydrin from Alkenes

13.0K
An alkene, such as propene, reacts with bromine in the presence of water to yield a halohydrin. Halohydrins contain a halogen and a hydroxyl group attached to adjacent carbons. When the halogen is bromine, it is called a bromohydrin, while a chlorohydrin has chlorine as the halogen.
13.0K
Reactions at the Benzylic Position: Halogenation01:11

Reactions at the Benzylic Position: Halogenation

2.6K
Benzylic halogenation takes place under conditions that favor radical reactions such as heat, light, or a free radical initiator like peroxide.
2.6K
Radical Substitution: Halogenation of Alkanes and Alkyl Substituents01:27

Radical Substitution: Halogenation of Alkanes and Alkyl Substituents

8.3K
In the presence of heat or light, alkanes react with molecular halogens to form alkyl halides by a substitution reaction called radical halogenation. This reaction has three steps: initiation, propagation, and termination, as seen in the radical chlorination of methane to produce methyl chloride.
In the initiation step of the reaction, the chlorine molecule undergoes homolytic cleavage in the presence of light or heat, forming two highly reactive chlorine radicals. Propagation occurs in two...
8.3K

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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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序列控制的交替块多基因:合成,结构特征,分子特性,以及用于检测的晶体管.

Kuo-Hsiu Huang1, Huai-Hsuan Liu1, Kuang-Yi Cheng1

  • 1Department of Applied Chemistry, National Yang Ming Chiao Tung University 1001 University Road Hsinchu 30010 Taiwan China yjcheng@nycu.edu.tw.

Chemical science
|August 18, 2023
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概括

我们为电子应用开发了新的序列控制联共聚合物,具有可调节的特性. 这些聚合物在有机场效应晶体管中表现出高性能,可以检测.

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科学领域:

  • 聚合物科学 聚合物科学
  • 有机电子 有机电子
  • 材料化学 材料化学

背景情况:

  • 顺序控制的合聚合物对于先进的电子设备至关重要.
  • 多基因具有可调节的光学和电子特性.
  • 开发具有可控序列的新型块共聚合物对于优化材料性能至关重要.

研究的目的:

  • 合成和表征一种新的交替块合共聚合物的新类.
  • 为了研究序列控制和素组成对聚合物特性的影响.
  • 探索这些新型聚合物在有机电子和传感方面的潜在应用.

主要方法:

  • 使用Ni(dppp) Cl2催化库马达聚合物的交替块共聚合物的合成.
  • 使用1H-NMR和13C-NMR光谱的聚合物结构和序列的表征.
  • 使用UV-Vis,循环电压计和GIWAXS评估光学,电化学和电荷传输特性.
  • 有机场效应晶体管 (OFET) 装置的制造和测试,用于检测.

主要成果:

  • 成功合成了三种新型序列控制多基因:P(SSe) b(STe),P(SSe) b(SeTe和P(STe) b(SeTe.
  • 通过催化剂转移聚凝,通过催化剂转移聚凝实现了对分子量,分散性,块长度和主链序列的精确控制.
  • 证明了高孔 OFET 流动性 (1.4 × 10^-2 cm^2 V^-1 s^-1) 对于 P ((SSe) b ((STe),这是含有特鲁的聚合物的一项记录.
  • 展示了使用含聚合物检测的潜力,表现出高灵敏度,选择性和可逆性.

结论:

  • 开发的交替块共聚合物为调整光电子特性提供了一个多功能平台.
  • 高区域规律性和可控序列导致高效的电荷传输和有前途的设备性能.
  • 泰鲁单元与的可逆反应使敏感和选择性的化学传感应用成为可能.