Solid-state assemblies and optical properties of conjugated oligomers combining fluorene and thiophene units

Surin, M., Sonar, P., Grimsdale, A. C., Müllen, 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, R., & Leclère, P. (2006) Solid-state assemblies and optical properties of conjugated oligomers combining fluorene and thiophene units. Journal of Materials Chemistry, 17(8), pp. 728-735.

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Abstract

Two conjugated oligomers, representing elementary segments of fluorene-thiophene 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 π-systems.

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ID Code: 75261
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: Agglomeration, Atomic force microscopy, Crystalline materials, Fluorine containing polymers, Olefins, Optical properties, Confocal microscopy, Optical spectra, Solid-state absorption, Solid-state assemblies, Oligomers
DOI: 10.1039/b610132a
ISSN: 0959-9428
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2007 © The Royal Society of Chemistry.
Deposited On: 28 Oct 2014 23:19
Last Modified: 30 Oct 2014 03:19

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