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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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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...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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,...
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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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.
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.
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p-Type Conjugated Polymers Containing Electron-Deficient Pentacyclic Azepinedione.

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.

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Researchers synthesized a new electron-deficient pentacyclic azepinedione (BTTA) building block for organic electronics. Polymers incorporating BTTA achieved high performance in organic field-effect transistors and solar cells, demonstrating its versatile application.

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Area of Science:

  • Organic electronics
  • Materials science
  • Polymer chemistry

Background:

  • Bisthienoazepinedione (BTA) is known for high-performance p-type conjugated polymers.
  • The ring-extended version, BTTA, is less explored.

Purpose of the Study:

  • Synthesize a novel ring-expanded electron-deficient pentacyclic azepinedione (BTTA) building block.
  • Investigate copolymers of BTTA with benzodithiophene (BDT) for organic electronic applications.

Main Methods:

  • Synthesized BTTA as a key building block.
  • Prepared three copolymers of BTTA with differently side-chained BDT units.
  • Fabricated and characterized organic field-effect transistors (OFETs) and organic photovoltaic (OPV) devices.

Main Results:

  • Polymers showed similar energy levels and absorption but varied film morphologies.
  • Best OFET hole mobilities reached 0.027 cm² V⁻¹ s⁻¹ with alkylthienyl side chains on BDT (pBDT-BTTA-2).
  • OPV devices achieved 6.78% efficiency with PC71BM and 13.5% with BTP-eC9 acceptor.

Conclusions:

  • The electron-deficient BTTA unit is versatile for high-performance p-type polymers.
  • Side chain engineering on BDT significantly impacts film morphology and device performance.
  • BTTA-based polymers show promising results for organic electronics, comparable to state-of-the-art.