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2007-12-26 - Article/Dans un journal avec peer-review - Anglais - 7 page(s)

Tomovic Z., van Dongen J., George S.J., Xu H.-L., Pisula W., Leclère Philippe , Smulders M.M.J., De Feyter S., Meijer E.W., Schenning A.P.H.J., "Star-Shaped Oligo(p-phenylenevinylene) Substituted Hexaarylbenzene: Purity, Stability, and Chiral Self-Assembly" in Journal of the American Chemical Society, 129, 51, 16190-16196

  • Edition : American Chemical Society, Washington (DC)
  • Codes CREF : Chimie des surfaces et des interfaces (DI1327), Chimie macromoléculaire (DI1315), Physique de l'état solide (DI1261), Chimie quantique (DI1321), Optique (DI1250)
  • Unités de recherche UMONS : Chimie des matériaux nouveaux (S817)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
Texte intégral :

Abstract(s) :

(Anglais) An oligo(p-phenylenevinylene) (OPV)-substituted hexaarylbenzene has been synthesized and fully characterized. Recycling gel permeation chromatography appeared to be a powerful technique to obtain the OPV molecules in a very pure form. X-ray analysis and polarization optical microscopy revealed that the OPV molecule is plastic crystalline at room temperature with an ordered columnar superstructure. In apolar solvents, the molecules self-assemble via a highly cooperative fashion into right-handed chiral superstructures, which are stable even at high temperatures and low concentration. Atomic force microscopy revealed right-handed fibers with a diameter of 6 nm, indicating p-stacked aggregates; on a silicon oxide substrate, supercoiled chiral structures were observed. STM studies on a liquid-solid interface showed that the star-shaped OPV molecule forms an organized monolayer having a chiral hexagonal lattice.

Notes :
  • (Anglais) Publié en ligne le 29 novembre 2007
Identifiants :
  • DOI : 10.1021/ja0765417