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 journalArticle

34 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

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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