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2007-02-28 - Article/Dans un journal avec peer-review - Anglais - 8 page(s)

Surin Mathieu , Sonar P., Grimsdale A.C., Müllenn K., De Feyter S., Habuchi S., Sarzi S., Braeken E., Ver Heyen A., Van Der Auweraer M., De Schryver F.C., Cavallini M., Moulin J.-F., Biscarini F., Femoni C., Lazzaroni Roberto , Leclère Philippe , "Solid-state Assemblies and Optical Properties of Conjugated Oligomers Combining Fluorene and Thiophene Units" in Journal of Materials Chemistry, 17, 8, 728-735

  • Edition : Royal Society of Chemistry, Cambridge (United Kingdom)
  • Codes CREF : Chimie macromoléculaire (DI1315), Chimie structurale (DI1317), Spectroscopie [électromagnétisme, optique, acoustique] (DI1255), Optique (DI1250), Chimie organique (DI1313)
  • 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) Two conjugated oligomers, representing elementary segments of fluorenethiophene copolymers, are compared in terms of the microscopic morphology and the optical properties of thin deposits. The atomic force microscopy morphological data and the solid-state absorption and emission spectra are interpreted in terms of the assembly of the conjugated molecules. The compound with a terthiophene central unit and fluorene end-groups shows well-defined monolayer-by-monolayer assembly into micrometer-long stripe-like structures, with a crystalline herringbone-type organization within the monolayers. Polarized confocal microscopy indicates a strong orientation of the crystalline domains within the stripes. In contrast, the compound with a terfluorene central unit and thiophene end groups forms no textured aggregates and the optical spectra in the solid-state are very similar to those recorded in solution, suggesting that the molecules interact only weakly in the solid. The difference in behaviour between the two compounds most probably originates from their different capability to form densely-packed assemblies of interacting p-systems.

Identifiants :
  • ISSN : 0959-9428
  • DOI : 10.1039/B610132A