Trends in electron-vibration and electronic interactions in bis(dimethylamino) mixed-valence systems: A joint experimental and theoretical investigation

Chad Risko, Veaceslav Coropceanu, Stephen Barlow, Victor Geskin, Karin Schmidt, Nadine E. Gruhn, Seth R. Marder, Jean-Luc Bredas*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

By using gas-phase ultraviolet photoelectron spectroscopy, vis/NIR spectroscopy, and electronic-structure calculations, we have investigated the electron-vibration and electronic interactions in a series of bisdimethylamino mixed-valence systems: N,N,N′,N′-tetramethyl-p-phenylenediamine, N,N,N′,N′-tetramethylbenzidine, and N,N,N′,N′- tetramethyltolane-4,4′-diamine. Experiment and theory concur to indicate that the electron-vibration coupling in these systems is dominated by interactions with symmetric modes. The results reveal that the strength of both electronic and electron-vibration couplings decreases as the molecular bridge lengthens. The parameters derived for the present compounds have been compared to those of diarylaminobased structural analogs. This comparison underlines that the replacement of the methyl terminal groups with p-anisyl groups has a significant effect on the electronic and electron-vibrational interactions.

Original languageEnglish (US)
Pages (from-to)7959-7967
Number of pages9
JournalJournal of Physical Chemistry C
Volume112
Issue number21
DOIs
StatePublished - May 29 2008

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Surfaces, Coatings and Films
  • Physical and Theoretical Chemistry

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