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Related Concept Videos

Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

3.1K
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...
3.1K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.1K
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...
3.1K
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

3.0K
The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
3.0K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.2K
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,...
2.2K
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

3.1K
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...
3.1K
Criteria for Aromaticity and the Hückel 4n + 2 Rule01:20

Criteria for Aromaticity and the Hückel 4n + 2 Rule

11.5K
Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?  
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as...
11.5K

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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Tetracyanocyclopentadienide-Based Stable Poly(aromatic) Anions.

Mustafa Ahmed1, Dung T Tran1, John Putziger1

  • 1Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States.

ACS Macro Letters
|May 16, 2022
PubMed
Summary

Researchers developed novel polynorbornene-based electrolytes incorporating a stable aromatic anion, tetracyanocyclopentadienide. These new materials exhibit high ionic conductivity and enhanced thermal stability, particularly when complexed with poly(3,4-ethylenedioxythiophene).

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Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Electrochemistry

Background:

  • Polyelectrolytes are polymers with ionized functional groups, crucial for various applications.
  • While many ionized groups exist, stable aromatic anions in polyelectrolytes are underexplored.
  • Aromatic anions offer potential for enhanced material properties.

Purpose of the Study:

  • To synthesize and characterize novel polyelectrolytes incorporating a stable aromatic anion.
  • To investigate the ionic conductivity and thermal stability of these new materials.
  • To explore their application in polymer ion complexes for improved performance.

Main Methods:

  • Ring-opening metathesis polymerization (ROMP) to synthesize polynorbornene-based electrolytes with tetracyanocyclopentadienide (PNb-TCCp).
  • Controlled molecular weight and low polydispersity achieved during polymerization.
  • Salt metathesis to form polyion complexes with doped poly(3,4-ethylenedioxythiophene) (PEDOT).

Main Results:

  • Successfully synthesized PNb-TCCp with controllable molecular weight and low polydispersity.
  • Achieved high ionic conductivity of 4.5 × 10^-5 S/cm in PNb-TCCp thin films.
  • Demonstrated enhanced thermal stability of PEDOT:PNb-TCCp ion complexes, retaining conductivity up to 180 °C.

Conclusions:

  • Stable aromatic anions can be effectively incorporated into polymer electrolytes.
  • PNb-TCCp exhibits promising ionic conductivity and thermal stability.
  • The developed polyion complexes show potential for high-performance applications requiring thermal robustness.