Chiroptical properties of poly(p-phenyleneethynylene) copolymers in thin films: Large g-values

James N. Wilson, Winfried Steffen, Trent G. McKenzie, Günter Lieser, Masao Oda, Dieter Neher, Uwe H.F. Bunz

Research output: Contribution to journalArticle

130 Scopus citations

Abstract

A series of chirally substituted poly (p-phenyleneethynylene) copolymers was prepared by alkyne metathesis of mixtures of two different 2,5-dialkyl-1,4-dipropynylbenzenes. One of the monomers was the chiral bis-2,5-(S)-3,7-dimethyloctyl-1,4-dipropynylbenzene, and the second one was an achiral dipropynyl monomer. If the content of chiral monomer is 25-50 mol %, unusually large chiroptical effects, that is, optical dissymmetries, result in absorption (g = -0.38) and emission (g = -0.19) of these copolymers. The large dissymmetries can be explained by a supramolecular ordering of the PPEs into stranded features that are visualized by dark-field transmission electron microscopy. The strands of chirally substituted PPEs display a striated structure that suggests that the whole feature is a single chirally twisted crystallite.

Original languageEnglish (US)
Pages (from-to)6830-6831
Number of pages2
JournalJournal of the American Chemical Society
Volume124
Issue number24
DOIs
StatePublished - Jun 19 2002
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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