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Related Concept Videos

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Types of Semiconductors

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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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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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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Cross-Conjugated Polymer Semiconductors.

Naixin Zhao1, Sung Jae Jeon1, Yuning Li1

  • 1Department of Chemical Engineering and Waterloo Institute for Nanotechnology (WIN) University of Waterloo, 200 University Ave West, Waterloo, Ontario, N2L 3G1, Canada.

Macromolecular Rapid Communications
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Summary
This summary is machine-generated.

Cross-conjugated polymers offer unique electronic properties due to branched electron delocalization. These materials show potential in various optoelectronic devices, with tunable characteristics for advanced applications.

Keywords:
conjugation switchingcross‐conjugated polymerscross‐conjugationlinear conjugationorganic electronicsstructure–property relationship

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Electronics

Background:

  • Cross-conjugated polymers possess unique branched π-electron delocalization, differing from linear conjugated polymers.
  • This unique structure leads to distinct optical, electronic, and redox properties.
  • These properties are not achievable with traditional conjugated polymer frameworks.

Purpose of the Study:

  • To provide a comprehensive review of cross-conjugated polymer systems.
  • To emphasize the structure-property relationships and their impact on optoelectronic performance.
  • To highlight recent advancements in the design and application of these materials.

Main Methods:

  • Review of existing literature on cross-conjugated polymers.
  • Analysis of structure-property relationships.
  • Case studies of applications in various organic electronic devices.

Main Results:

  • Cross-conjugated polymers exhibit unique optoelectronic and redox behaviors.
  • Applications demonstrated in organic field-effect transistors (OFETs), organic light-emitting diodes (OLEDs), sensors, electrochromic devices, solar cells, and energy storage.
  • While typically having lower charge carrier mobility, structural transformations can enhance mobility.

Conclusions:

  • Cross-conjugated polymers offer significant potential for emerging applications requiring multifunctionality and responsiveness.
  • Tunable redox behavior is a key advantage of these materials.
  • Further research can unlock advanced functionalities through strategic design and application.