Electronic excitations in a ladder type fluoranthenopyracylene in its neutral and charged states: A theoretical and experimental study

Vladimír Lukeš, Katarína Matuszná, Peter Rapta, Lothar Dunsch, Adelia Justina Aguiar Aquino, Hans Lischka

Research output: Contribution to journalArticlepeer-review

Abstract

This work reports on theoretical and spectroelectrochemical studies of a thermally and chemically stable fluoranthenopyracylene ladder type molecule 7,10,17,20 tetra-p-dodecylphenyl(bisfluorantheno[8,9-a,c]) pyracylene. Optimal geometries were evaluated for neutral and positively/negatively charged states performing density functional theory (DFT) calculations. Absorption spectral line frequencies as well as oscillator strengths were calculated using the time-dependent DFT and collective electronic oscillator (CEO) methods. The calculated optical spectra are in good agreement with the experimental measurements in solution. The difference of charged states produced by reduction and/or oxidation versus the electronic neutral forms on the vertical excitation energies and CEO electronic density matrix distribution has been characterized and compared to the geometrical changes of the molecular fragments. The localization of excitation in the optical transition of the charged states shows that the excitation is less separated and shows larger electronic coherence in comparison to the neutral form.

Original languageEnglish
Pages (from-to)911-928
Number of pages18
JournalZeitschrift fur Physikalische Chemie
Volume221
Issue number7
DOIs
StatePublished - 2007

Keywords

  • Coherence
  • Delocalization
  • Optical spectra
  • TDDFT
  • π-conjugated system

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