2,6-Diphenyl- and -distyryl-capped 3,7-dialkoxybenzo[1,2-b:4,5-b′]dithiophenes and their dithieno-annulated higher homologs: Structural phase transition with enhanced charge carrier mobility

Sojiro Minami, Marina Ide, Koji Hirano, Tetsuya Satoh, Tsuneaki Sakurai, Kenichi Kato, Masaki Takata, Shu Seki, Masahiro Miura

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Synthesis of the title benzo[1,2-b:4,5-b′]dithiophenes was achieved using 2-ethylhexyl 3,7-dihydroxybenzo[1,2-b:4,5-b′]dithiophene-2,6-dicarboxylate as the common starting material. The effect of the introduction of phenyl and styryl groups as well as thieno-annulation to the benzo[1,2-b:4,5-b′]dithiophene core on π-conjugation was estimated by means of absorption and emission spectrometry and cyclic voltammetry. The phase behaviours of the compounds were also observed by differential scanning calorimetry and the dithieno-annulated higher homologs were found to show a solid-solid (crystalline-crystalline) phase transition. Then, intrinsic charge carrier mobilities in the π-systems were measured by the flash-photolysis time-resolved microwave conductivity (FP-TRMC) method and the values were in the range of 0.04-0.17 cm2 V-1 s-1. Remarkably, the thieno-annulated and phenyl-capped derivative showed a temperature/phase-dependent hole mobility profile with 3-fold increment in the second crystalline phase above 100 °C.

Original languageEnglish
Pages (from-to)18805-18812
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number35
DOIs
Publication statusPublished - 2014 Aug 13
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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