Synthesis and Optoelectronic Properties of Nanometer-Sized and Highly Soluble Homocoupled Oligodiacetylenes

G.S. Pilzak, J. Baggerman, B. van Lagen, M.A. Posthumus, E.J.R. Sudhölter, H. Zuilhof

Research output: Contribution to journalArticleAcademicpeer-review

13 Citations (Scopus)

Abstract

Color and shape of oligodiacetylenes: We synthesized a series of highly soluble homocoupled oligodiacetylenes (HODAs). The color of these oligomers is dependent on the molecular length and aggregation state (see picture). The optical properties of these materials were studied by using both steady-state and time-resolved spectroscopic techniques. A new series of pure, nanometer-sized and highly-soluble homocoupled oligodiacetylenes (HODA) consisting of two symmetrical oligodiacetylene units was synthesized with high yield and on a multi-milligram scale under mild, catalytic Sonogashira conditions. The max and the max of absorption for these HODAs show an increase with the chain elongation. The max converges to 450 nm for the longest members of the series at micromolar concentration and to 462 nm for thin drop-casted films. An additional red-shifted absorption is observed in the solid state and in solution at low temperatures, which is caused by aggregation. The max of the fluorescence emission increases with the chain length and reaches 492 nm for the longest oligomer. The fluorescence quantum yield has its maximum for the shortest oligomer and decreases rapidly for the longer ones. A similar trend is found for the fluorescence lifetime with a maximum of 100 ps for the homocoupled monomer. The rotational correlation time shows a linear increase with the oligomer length. This reveals a significant persistence length and indicates that the HODA molecules are fully stretched molecular rods (up to 8.2 nm)
Original languageEnglish
Pages (from-to)2296-2304
JournalChemistry-A European Journal
Volume15
Issue number10
DOIs
Publication statusPublished - 2009

Keywords

  • organic semiconductors
  • conjugated polymers
  • model compounds
  • oligomers
  • polydiacetylene
  • fluorescence
  • oligoenynes
  • nanostructures
  • configuration
  • transistors

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