Competition between conformational relaxation and intramolecular electron transfer within phenothiazine-pyrene dyads

J. Daub, R. Engl, J. Kurzawa, S. E. Miller, S. Schneider, A. Stockmann, Michael R Wasielewski

Research output: Contribution to journalArticle

131 Citations (Scopus)

Abstract

The competition between conformational dynamics and electron transfer within a series of phenothiazine(phenyl)n-pyrene (n = 0, 1) electron donor-acceptor dyads of potential use in organic light emitting diodes was examined using femtosecond transient absorption spectroscopy. The molecular structures of these dyads permit only torsional motions around the single bonds joining each aromatic subunit. The redox properties of these molecules are nearly independent of the phenyl bridging group, whereas spectroelectrochemistry shows that the UV/vis absorption spectra of the oxidized and reduced species vary with the bridge. Each molecule exhibits dual fluorescence emission which provides evidence for conformational heterogeneity. Emission from a locally excited state originates from a minority conformation, in which electron transfer is negligible, whereas emission because of ion pair recombination results from the majority conformation which undergoes electron transfer. The electron-transfer reactions proceed with time constants

Original languageEnglish
Pages (from-to)5655-5665
Number of pages11
JournalJournal of Physical Chemistry A
Volume105
Issue number23
DOIs
Publication statusPublished - Jun 14 2001

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phenothiazines
pyrenes
electron transfer
Electrons
Conformations
Spectroelectrochemistry
minorities
Molecules
time constant
Organic light emitting diodes (OLED)
molecules
absorption spectroscopy
molecular structure
Absorption spectroscopy
light emitting diodes
Excited states
Joining
Molecular structure
Absorption spectra
absorption spectra

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Competition between conformational relaxation and intramolecular electron transfer within phenothiazine-pyrene dyads. / Daub, J.; Engl, R.; Kurzawa, J.; Miller, S. E.; Schneider, S.; Stockmann, A.; Wasielewski, Michael R.

In: Journal of Physical Chemistry A, Vol. 105, No. 23, 14.06.2001, p. 5655-5665.

Research output: Contribution to journalArticle

Daub, J. ; Engl, R. ; Kurzawa, J. ; Miller, S. E. ; Schneider, S. ; Stockmann, A. ; Wasielewski, Michael R. / Competition between conformational relaxation and intramolecular electron transfer within phenothiazine-pyrene dyads. In: Journal of Physical Chemistry A. 2001 ; Vol. 105, No. 23. pp. 5655-5665.
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