Hysteretic thermochromism of regioregular poly(3-alkylthiophene) thin films

Hiroaki Tachibana, Noriko Hosaka, Yoshinori Tokura

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

We have synthesized regioregular poly(3-alkylthiophene) (P3T-HT) with different lengths of alkyl chains (CnH2n+1; n = 4, 8, 14, 20) attached to the polymer backbones. The chain-length-dependent thermochromic behavior was investigated by measurements of visible exciton absorption, photoluminescence, and IR vibrational absorption spectra. Optical spectra in ordered P3T-HT thin films show the nearly identical one-dimensional exciton state irrespective of the alkyl chain length, while the hysteretic thermochromic transition temperature decreases with the increase in the length. Upon the thermochromic phase transition, the order-disorder conformational change of alkyl chains occurs in a manner correlated with the conjugation length change of polythiophene backbone structures.

Original languageEnglish
Pages (from-to)1823-1827
Number of pages5
JournalMacromolecules
Volume34
Issue number6
DOIs
Publication statusPublished - 2001 Mar 13
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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