Strong main-chain length-dependence for the β-phase formation of oligofluorenes

Tomohiro Shiraki, Shoichiro Shindome, Fumiyuki Toshimitsu, Tsuyohiko Fujigaya, Naotoshi Nakashima

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Poly-/oligofluorenes are promising luminescent materials applicable in organic light emitting diodes, lasers, etc. In particular, the β-phase structure, in which the fluorene main chain adopts a planar conformation with extended conjugation, shows characteristic optical properties. In this study, we have synthesized oligo(9,9′-dioctylfluorenes) whose chain lengths (n) are n = 9, 12, 15, 18, 21, 24 and 27 mers. Interestingly, the β-phase formation of the oligofluorenes is observed remarkably for oligofluorenes with n > 15, which is confirmed by the UV/vis and fluorescence spectroscopy. This study elucidates the structure-property relationship required to design high performance fluorene-based materials. Such a chain-length-dependent optical property provides useful information for utilizing the materials in many applications.

Original languageEnglish
Pages (from-to)5103-5109
Number of pages7
JournalPolymer Chemistry
Issue number28
Publication statusPublished - Jul 28 2015

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Biochemistry
  • Polymers and Plastics
  • Organic Chemistry


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