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Electron-phonon interactions in charged cubic fluorocarbon cluster, (CF)8.

Takashi Kato1, Tokio Yamabe

  • 1Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan. kato@fukui.kyoto-u.ac.jp

The Journal of Chemical Physics
|July 23, 2004
PubMed
Summary

Electron-phonon interactions in fluorocarbon (CF)8 were studied. H-F substitution significantly increased electron-phonon coupling and phonon frequencies in the monoanion, unlike H-D substitution, due to fluorine

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Area of Science:

  • * Computational Chemistry
  • * Materials Science
  • * Solid-State Physics

Background:

  • * Understanding electron-phonon interactions is crucial for predicting material properties.
  • * Charged cubic molecules like (CH)8 and (CF)8 serve as model systems for studying these interactions.
  • * Previous studies have explored these interactions in hydrocarbon analogues.

Purpose of the Study:

  • * To investigate and quantify electron-phonon interactions in charged cubic fluorocarbon, (CF)8.
  • * To compare these interactions with those in charged (CH)8 and (CD)8.
  • * To elucidate the influence of H-F and H-D substitution on electron-phonon coupling and vibrational frequencies.

Main Methods:

  • * Theoretical calculations were employed to study electron-phonon interactions.

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  • * Analysis focused on the coupling between molecular orbitals (HOMO, LUMO) and vibrational modes.
  • * Electron-phonon coupling constants and logarithmically averaged phonon frequencies were calculated.

    • Main Results:

    • * In (CF)8, specific vibrational modes (A1g, T2g, Eg) show strong coupling with the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO).
    • * The monoanion of (CF)8 exhibits significantly stronger electron-phonon coupling (l(-1) = 0.932 eV) and higher average phonon frequency (ω(ln,-1) = 1365 cm(-1)) compared to its monocation (l(+1) = 0.585 eV, ω(ln,+1) = 998 cm(-1)).
    • * H-F substitution in cubane leads to a much larger increase in l(-1) and ω(ln,-1) than H-D substitution, attributed to larger carbon atom displacements and localized electron distributions.

    Conclusions:

    • * H-F substitution has a more pronounced effect on electron-phonon interactions in the (CF)8 monoanion than H-D substitution.
    • * The localization of molecular orbitals and the atomic masses of substituents play key roles in mediating these interactions.
    • * These findings provide insights into the vibrational dynamics and electronic properties of fluorinated organic materials.