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Related Concept Videos

Electric Dipoles and Dipole Moment01:30

Electric Dipoles and Dipole Moment

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Consider two charges of equal magnitude but opposite signs. If they cannot be separated by an external electric field, the system is called a permanent dipole. For example, the water molecule is a dipole, making it a good solvent.
Theoretically, studying electric dipoles leads to understanding why the resultant electric forces around us are weak. Since electric forces are strong, remnant net charges are rare. Hence, the interaction between dipoles helps us understand electrical interactions in...
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Polymers02:34

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
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Induced Electric Dipoles01:28

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Directing Effect of Substituents: ortho–para-Directing Groups01:14

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Ortho–para directors are substituent groups attached to the benzene ring and direct the addition of an electrophile to the positions ortho or para to the substituent. All electron-donating groups are considered ortho–para directors. They donate electrons to the ring and make the ring more electron-rich. The ring is therefore susceptible to the addition of electrophiles. Substituents such as amino, hydroxy, or alkoxy, containing lone pairs on the atom adjacent to the ring, donate...
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Updated: Feb 2, 2026

Reactive Vapor Deposition of Conjugated Polymer Films on Arbitrary Substrates
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Dipole-Switchable Poly(para-phenyleneethynylene)s: Ferroelectric Conjugated Polymers.

Soh Kushida1,2, Emanuel Smarsly1, N Maximilian Bojanowski1

  • 1Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld (INF) 270, 69120, Heidelberg, Germany.

Angewandte Chemie (International Ed. in English)
|November 8, 2018
PubMed
Summary

Researchers created a novel ferroelectric conjugated polymer by incorporating dipolar 2,3-difluorobenzene units into poly(para-phenyleneethynylene) (PPE). This new material exhibits remanent polarization, opening avenues for advanced electronic applications.

Keywords:
molecular devicesmolecular rotorsorganic ferroelectricspolymers

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Electronics

Background:

  • Conjugated polymers offer unique electronic and optical properties.
  • Developing ferroelectric organic materials is crucial for advanced electronic devices.
  • Poly(para-phenyleneethynylene)s (PPEs) are a versatile class of conjugated polymers.

Purpose of the Study:

  • To synthesize and characterize a novel ferroelectric conjugated polymer.
  • To investigate the structure-property relationships governing ferroelectricity in modified PPEs.
  • To explore the potential of incorporating dipolar units into polymer backbones for new functionalities.

Main Methods:

  • Synthesis of a partially fluorinated poly(para-phenyleneethynylene) (PPE) incorporating 2,3-difluorobenzene units.
  • Solid-state characterization to assess structural features and molecular dynamics.
  • Electrical field application to determine ferroelectric properties at room temperature.

Main Results:

  • Introduction of dipolar 2,3-difluorobenzene units into the PPE backbone.
  • Observation of molecular rotor behavior at high temperatures and clamped orientation at room temperature.
  • Demonstration of remanent polarization and ferroelectric behavior in the solid state upon application of moderate electric fields.

Conclusions:

  • The designed PPE exhibits ferroelectric properties due to the specific arrangement and behavior of the difluorinated benzene units.
  • The concept of introducing dipolar units into poly(aryleneethynylene)s is a viable strategy for creating novel ferroelectric conjugated polymers.
  • This work paves the way for the development of new organic electronic materials with switchable polarization.