Probing exciton localization/delocalization: Transient dc photoconductivity studies of excited states of symmetrical porphyrin monomers, oligomers, and supramolecular assemblies

Chunxing She, James E. McGarrah, Suk Joong Lee, Joshua L. Goodman, Sonbinh T. Nguyen, J. A G Williams, Joseph T Hupp

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Solution-phase transient de photoconductivity (TDCP) measurements are used to address the question of exciton localization/delocalization in strongly coupled oligomeric porphyrins and in well-defined, higherorder assemblies of oligomers (ladder and prism assemblies). The approach used is determination of the excited-state excess polarizability volume, Δα v -a quantity known to report on exciton derealization. The measurements reveal for the oligomers that singlet excitons are substantially delocalized but that triplet excitons are much more localized. For each of the two higher-order assemblies, the measurements reveal that excitons are transiently confined to individual oligomeric subunits rather than being delocalized over the entire assembly.

Original languageEnglish
Pages (from-to)8182-8186
Number of pages5
JournalJournal of Physical Chemistry A
Volume113
Issue number29
DOIs
Publication statusPublished - Jul 23 2009

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Porphyrins
Photoconductivity
oligomers
Oligomers
Excited states
porphyrins
photoconductivity
assemblies
monomers
Monomers
excitons
excitation
Ladders
Prisms
ladders
prisms
assembly
LDS 751

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Probing exciton localization/delocalization : Transient dc photoconductivity studies of excited states of symmetrical porphyrin monomers, oligomers, and supramolecular assemblies. / She, Chunxing; McGarrah, James E.; Lee, Suk Joong; Goodman, Joshua L.; Nguyen, Sonbinh T.; Williams, J. A G; Hupp, Joseph T.

In: Journal of Physical Chemistry A, Vol. 113, No. 29, 23.07.2009, p. 8182-8186.

Research output: Contribution to journalArticle

She, Chunxing ; McGarrah, James E. ; Lee, Suk Joong ; Goodman, Joshua L. ; Nguyen, Sonbinh T. ; Williams, J. A G ; Hupp, Joseph T. / Probing exciton localization/delocalization : Transient dc photoconductivity studies of excited states of symmetrical porphyrin monomers, oligomers, and supramolecular assemblies. In: Journal of Physical Chemistry A. 2009 ; Vol. 113, No. 29. pp. 8182-8186.
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