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Related Concept Videos

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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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
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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties
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Heteroacene-Based Polymer with Fast-Switching Visible-Near Infrared Electrochromic Behavior.

Tharindu A Ranathunge1,2, Christine Curiac1, Kevin A Green3

  • 1Department of Chemistry and Biochemistry, University of Mississippi University, Oxford, Mississippi 38677, United States.

ACS Applied Materials & Interfaces
|January 24, 2023
PubMed
Summary
This summary is machine-generated.

A novel electronically conducting polymer (PTRPZ-EDOT) was synthesized for electrochromic applications. This polymer exhibits fast switching times and high optical contrast, demonstrating potential for smart windows and flexible displays.

Keywords:
electrochromismelectropolymerizationheteroacenesemiconductorsspectroelectrochemistry

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electrochemistry

Background:

  • Electronically conducting polymers (ECPs) are crucial for advanced electronic devices.
  • The development of novel ECPs with tailored properties is an ongoing area of research.
  • Heteroacene-based molecular scaffolds offer unique electronic and conducting characteristics.

Purpose of the Study:

  • To synthesize and characterize a novel ECP, PTRPZ-EDOT, for electrochromic applications.
  • To investigate the electrochromic properties, including switching times and optical contrast, of the PTRPZ-EDOT polymer.
  • To demonstrate the potential of PTRPZ-EDOT in fabricating functional electrochromic devices.

Main Methods:

  • Synthesis of the TRPZ-EDOT molecule, incorporating a heteroacene scaffold with EDOT termini.
  • Electropolymerization of TRPZ-EDOT to form polymer thin films.
  • Characterization using atomic force microscopy (AFM) for surface topography and spectroelectrochemistry for electrochromic performance evaluation.

Main Results:

  • PTRPZ-EDOT demonstrated remarkable spectroscopic and conductive properties upon electropolymerization.
  • AFM analysis provided insights into the surface morphology of the polymer films.
  • Spectroelectrochemical tests revealed fast switching times (4.07 s coloration, 0.47 s bleaching) at 539 nm.
  • The polymer exhibited a high optical contrast (36-44%) at 539 nm.
  • Charge carrier bands were observed in the NIR region (1000-1700 nm) within a 0-1 V potential range.

Conclusions:

  • The synthesized PTRPZ-EDOT is a promising material for electrochromic applications.
  • The polymer's fast switching speeds and high optical contrast are suitable for device fabrication.
  • PTRPZ-EDOT shows potential for use in smart windows, flexible screens, and energy storage devices.