Relationship between dynamic planarization processes and exciton delocalization in cyclic oligothiophenes

Pyosang Kim, Kyu Hyung Park, Woojae Kim, Tomoya Tamachi, Masahiko Iyoda*, Dongho Kim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Scopus citations


In cyclic molecular structures, while the effect of conformational disorder on exciton delocalization is well understood, the impact of dynamic planarization processes remains unclear due to a lack of detailed investigation on the associated exciton dynamics. Thus, we have investigated the exciton delocalization of π-conjugated linear and cyclic oligothiophenes in the course of dynamic planarization processes by time-resolved fluorescence spectra measurements and theoretical calculations. Especially, through a comparative analysis of linear and cyclic oligothiophenes, we found that the evolution of 0-0 and 0-1 vibronic bands is strongly related to the conformations of cyclic molecular systems, reflecting the extent of exciton delocalization. Collectively, we believe that our findings are applicable to various π-conjugated organic materials and will provide new insights into the relationship between exciton delocalization and cyclic molecular conformation. (Graph Presented)

Original languageEnglish (US)
Pages (from-to)451-456
Number of pages6
JournalJournal of Physical Chemistry Letters
Issue number3
StatePublished - Feb 5 2015

ASJC Scopus subject areas

  • General Materials Science
  • Physical and Theoretical Chemistry


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