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Unsymmetrical and Symmetrical Push-Pull Phenothiazines.

Yogajivan Rout1, Prabhat Gautam1, Rajneesh Misra1

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New push-pull phenothiazines were synthesized and studied. Stronger electron acceptors like TCBD and expanded TCBD units significantly lowered energy levels, enhancing charge transfer and redox properties.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photophysics

Background:

  • Phenothiazines are versatile organic molecules with applications in various fields.
  • Push-pull systems are crucial for developing materials with tunable electronic and optical properties.
  • Tetracyanoethylene (TCNE) and 7,7,8,8-tetracyanoquinodimethane (TCNQ) are common strong electron acceptors.

Purpose of the Study:

  • To design and synthesize novel unsymmetrical and symmetrical push-pull phenothiazines.
  • To investigate the impact of varying cyano-based acceptor units on phenothiazine properties.
  • To explore the photophysical, electrochemical, and computational characteristics of the synthesized compounds.

Main Methods:

  • Pd-catalyzed Sonogashira cross-coupling reaction for synthesis.
  • [2 + 2] cycloaddition-retroelectrocyclization with TCNE and TCNQ.
  • Photophysical (absorption), electrochemical (redox), and computational studies.

Main Results:

  • Successful synthesis of push-pull phenothiazines (3-7) with varying acceptor units.
  • Substitution with 1,1,4,4-tetracyanobutadiene (TCBD) and expanded TCBD units induced strong intramolecular charge transfer.
  • Compounds exhibited lowered LUMO energy levels and multiredox waves.
  • Computational studies confirmed LUMO stabilization and reduced HOMO-LUMO gap with increased acceptor strength.

Conclusions:

  • The systematic variation of electron acceptors significantly influences the electronic and photophysical properties of phenothiazines.
  • Synthesized phenothiazines show potential for applications requiring strong intramolecular charge transfer and tunable redox behavior.
  • The study provides insights into structure-property relationships for designing advanced organic electronic materials.