Synthetic studies of extraordinarily long oligothiophenes

T. Otsubo, Y. Aso, K. Takimiya, H. Nakanishi, N. Sumi

Research output: Contribution to journalConference articlepeer-review

11 Citations (Scopus)


This paper describes synthetic approaches to extraordinarily long oligothiophenes, which correspond to mono-disperse polymers. The most successful approach is a combination of a random coupling reaction of mono- and diethynylsexithiophenes and a subsequent sodium sulfide-induced cyclization reaction of the diacetylene parts to thiophene rings, forming a series of long oligothiophenes Oct-nT up to the 48-mer. The systematic study of the Oct-nT series reveals that the effective conjugation length of conjugated polythiophenes extends to around 20 thiophene units.

Original languageEnglish
Pages (from-to)325-328
Number of pages4
JournalSynthetic Metals
Publication statusPublished - 2003 Mar 13
EventISCOM 2001 - Rusutsu, Hokkaido, Japan
Duration: 2001 Sept 102001 Sept 14


  • Effective conjugation length
  • Mono-disperse polymers
  • Nanoscale molecules
  • Oligothiophenes


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