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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Poly(trifluoromethyl)azulenes: structures and acceptor properties.

Tyler T Clikeman1, Eric V Bukovsky, Igor V Kuvychko

  • 1Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA. steven.strauss@colostate.edu olga.boltalina@colostate.edu.

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Six novel poly(trifluoromethyl)azulenes were synthesized and show potent electron-accepting capabilities. These compounds can form ordered structures when combined with electron-donating molecules like pyrene.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Azulenes are non-alternant hydrocarbons with unique electronic properties.
  • Poly(trifluoromethyl)azulenes are a class of compounds with potential applications in electronics.
  • Electron-accepting materials are crucial for developing advanced functional materials.

Purpose of the Study:

  • To synthesize novel poly(trifluoromethyl)azulenes.
  • To investigate the electron-accepting properties of these new compounds.
  • To explore their self-assembly behavior in the solid state.

Main Methods:

  • High-temperature reaction for synthesis of six new poly(trifluoromethyl)azulenes.
  • Gas-phase and solution-phase measurements to determine electron-accepting properties.
  • Crystallization studies with pyrene to observe π-stacked column formation.

Main Results:

  • Successful synthesis of six new poly(trifluoromethyl)azulenes in one step.
  • Demonstrated strong electron-accepting properties in both gas and solution phases.
  • Observed the formation of regular π-stacked columns in donor-acceptor crystals with pyrene.

Conclusions:

  • The new poly(trifluoromethyl)azulenes possess significant electron-accepting characteristics.
  • These compounds are promising building blocks for creating ordered supramolecular structures.
  • The findings open avenues for designing novel organic electronic materials.