Journal
JOURNAL OF PHYSICAL CHEMISTRY A
Volume 113, Issue 29, Pages 8182-8186Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp903125t
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Funding
- Weinberg College of Arts and Sciences, and the Basic Energy Sciences Program, Office of Science, U.S. Department of Energy [DE-FG02-87ER13808]
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Solution-phase transient dc photoconductivity (TDCP) measurements are used to address the question of exciton local ization/delocalization in strongly coupled oligomeric porphyrins and in well-defined, higher-order assemblies of oligomers (ladder and prism assemblies). The approach used is determination of the excited-state excess polarizability volume, Delta alpha(V)-a quantity known to report on exciton delocalization. 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.
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