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Updated: Sep 13, 2025

Reactive Vapor Deposition of Conjugated Polymer Films on Arbitrary Substrates
07:32

Reactive Vapor Deposition of Conjugated Polymer Films on Arbitrary Substrates

Published on: January 17, 2018

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替代模式在四种半同位体四聚乙烯 - - 硫衍生物中的作用

Shuai Hou1, Hanxiao Tian1, Ruiyao Li1

  • 1The Education Ministry Key Lab of Resource Chemistry, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Frontiers Science Center of Biomimetic Catalysis, College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China.

Molecules (Basel, Switzerland)
|July 30, 2025
PubMed
概括

区域化学显著影响四聚乙烯-硫的发光. 烯核心上的特定替代模式调整光发发光量子产量 (PLQYs),对于设计先进的发光材料至关重要.

关键词:
PLQQYY 是一个很大的问题.聚合引发的排放量 聚合引发的排放量替代模式 替代模式 替代模式四聚乙烯四聚乙烯四聚乙烯四聚乙烯四聚乙烯四聚乙烯四聚乙烯硫烯 thiophene 硫烯 thiophene 硫烯 thiophene 硫烯 thiophene 硫烯 thiophene 硫烯 thiophene

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level06:55

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives09:22

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When disubstituted benzenes undergo electrophilic substitution, the product distribution depends on the directing effect of both substituents. When the directing effects of both substituents reinforce each other, a single product is obtained. For example, bromination of p-nitrotoluene occurs ortho to the methyl group and meta to the nitro group, which is the same position, resulting in a single product. However, if the directing effects of the two groups oppose each other, the...
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Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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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.
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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.
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