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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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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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 para position.
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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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Updated: May 14, 2026

Flash Infrared Annealing for Perovskite Solar Cell Processing
05:15

Flash Infrared Annealing for Perovskite Solar Cell Processing

Published on: February 3, 2021

Phenothiazine: A Promising Core for Perovskite and Dye-Sensitized Solar Cells.

Luis Alberto Illicachi1, David Oliveros Garavito1, Viviana Cuartas2

  • 1Research Group of Chemical and Biotechnology, Faculty of Basic Sciences, Universidad Santiago de Cali, Cali 760035, Colombia.

Molecules (Basel, Switzerland)
|May 13, 2026
PubMed
Summary

Phenothiazine (PTZ) organic materials offer a sustainable and cost-effective solution for advanced photovoltaic applications. This review highlights their design, synthesis, and performance in solar cells, paving the way for future solar technologies.

Keywords:
dye-sensitized solar cellselectroactive unitsorganic materialsperovskite solar cellsphenothiazine

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Last Updated: May 14, 2026

Flash Infrared Annealing for Perovskite Solar Cell Processing
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Area of Science:

  • Materials Science
  • Renewable Energy
  • Organic Electronics

Background:

  • Photovoltaic technologies are crucial for renewable energy, with perovskite solar cells (PSCs) and dye-sensitized solar cells (DSSCs) showing high efficiencies.
  • Phenothiazine (PTZ) is a promising organic material due to its favorable photophysical properties, low cost, and reduced environmental impact.

Purpose of the Study:

  • To review recent advancements in phenothiazine-based organic materials for photovoltaic applications.
  • To analyze synthetic routes, fundamental operating principles of solar cells, and device parameters related to PTZ materials.
  • To examine the synthesis, characterization, and performance of novel PTZ-derived molecules in photovoltaic devices.

Main Methods:

  • Literature review of recent studies on phenothiazine-based organic materials for solar cells.
  • Analysis of synthetic strategies for phenothiazine derivatives.
  • Examination of structure-property relationships and device performance metrics.

Main Results:

  • Phenothiazine-based materials exhibit excellent structural and photophysical properties suitable for photovoltaic applications.
  • PTZ derivatives have been successfully synthesized, characterized, and integrated into photovoltaic devices, demonstrating promising performance.
  • The review covers key synthetic routes and fundamental aspects of solar cell operation relevant to PTZ materials.

Conclusions:

  • Phenothiazine-based organic materials represent a viable and sustainable option for next-generation solar technologies.
  • Further research into PTZ derivatives can lead to enhanced efficiency and stability in photovoltaic devices.
  • The low cost and environmental benefits of PTZ materials support their widespread adoption in the renewable energy sector.