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Related Concept Videos

Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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,...
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta catalyst, high molecular...
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.
Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...

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Related Experiment Video

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

Conjugated polymers from naphthalene bisimide.

Xugang Guo1, Mark D Watson

  • 1Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055, USA.

Organic Letters
|November 5, 2008
PubMed
Summary
This summary is machine-generated.

High molecular weight donor-acceptor conjugated polymers were synthesized using Stille coupling. Naphthalene bisimide units controlled LUMO energy, while thiophene monomers influenced HOMO energy, yielding tunable optical energy gaps.

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Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Published on: February 7, 2017

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization

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Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
12:07

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Published on: April 1, 2013

Area of Science:

  • Organic electronics
  • Polymer chemistry

Background:

  • Donor-acceptor conjugated polymers are crucial for organic electronics.
  • Controlling energy levels (HOMO/LUMO) is key for tuning material properties.

Purpose of the Study:

  • Synthesize high molecular weight donor-acceptor conjugated polymers.
  • Investigate the influence of naphthalene bisimide (NBI) and thiophene units on polymer energy levels.
  • Determine the resulting optical energy gaps.

Main Methods:

  • Stille coupling reaction between dibromonaphthalene bisimides (NBI) and stannylated thiophene monomers.
  • Electrochemical measurements to determine LUMO and HOMO energy levels.
  • Optical absorption spectroscopy to measure optical energy gaps.
  • Differential scanning calorimetry (DSC) and fiber Wide-Angle X-ray Diffraction (WAXD) for material characterization.

Main Results:

  • Successful synthesis of high molecular weight donor-acceptor conjugated polymers.
  • LUMO energy levels were invariant, dictated by the NBI units.
  • HOMO energy levels varied based on the thienyl comonomers.
  • Achieved tunable optical energy gaps ranging from 1.7 to 1.1 eV.

Conclusions:

  • The synthetic strategy allows for precise control over polymer energy levels.
  • NBI and thiophene units can be independently tuned to achieve desired electronic properties.
  • The resulting polymers hold promise for applications in organic electronic devices.