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Oligo- and polyselenophenes: a theoretical study.

Sanjio S Zade1, Natalia Zamoshchik2, Michael Bendikov2

  • 1School of Chemistry, Indian Institute of Science Education and Research, Kolkata (India).

Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 7, 2009
PubMed
Summary

New conducting polymers, polyselenophenes, exhibit unique properties compared to oligothiophenes. These selenium-based conjugated systems show a more quinoid character and lower band gaps, suggesting potential for advanced electronic applications.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Organic Electronics

Background:

  • Conducting polymers are crucial for organic electronics.
  • Recently synthesized polyselenophenes show promising properties.
  • Comparison with established oligothiophenes is needed to understand their potential.

Purpose of the Study:

  • To theoretically investigate oligoselenophenes and polyselenophenes.
  • To compare their electronic and structural properties with oligothiophenes.
  • To elucidate the impact of inter-ring twisting on their characteristics.

Main Methods:

  • Density Functional Theory (DFT) calculations using B3LYP/6-31G(d) level.
  • Study of oligoselenophenes up to the 50-mer (50 Se), their cation radicals, and dications.
  • Comparative analysis with corresponding oligothiophenes.

Main Results:

  • Oligo- and polyselenophenes display a more quinoid character and lower band gaps than their thiophene counterparts.
  • Inter-ring twisting significantly influences the band gap, bond-length alternation, and charge distribution.
  • Twisting in selenophenes requires less energy, and inter-ring distances are shorter compared to oligothiophenes.

Conclusions:

  • Oligo- and polyselenophenes offer distinct electronic and structural properties compared to oligothiophenes.
  • Their lower band gap and reduced twisting energy suggest potential for novel electronic devices.
  • Further research into selenium-based conjugated systems is warranted for materials innovation.