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Supramolecular Organization in Fluorene/Indenofluorene– Oligothiophene Alternating Conjugated Copolymers
Author(s) -
Surin M.,
Sonar P.,
Grimsdale A. C.,
Müllen K.,
Lazzaroni R.,
Leclère P.
Publication year - 2005
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200500241
Subject(s) - materials science , fluorene , conjugated system , copolymer , supramolecular chemistry , stacking , monomer , alkyl , crystallography , polymer , nanotechnology , organic chemistry , crystal structure , composite material , chemistry
A series of conjugated copolymers containing fluorene or indenofluorene units alternating with oligothiophene segments, with potential interest for use as the active layer in field‐effect transistors, is investigated. Atomic force microscopy analysis of the morphology of thin deposits shows either the formation of fibrillar structures, which are the signature of long‐range π stacking, or the presence of untextured aggregates, resulting from disordered assembly. These morphologies are interpreted in terms of the supramolecular organization of the conjugated chains. Molecular modeling simulations indicate that the commensurability between the lengths of the monomer units and the presence of alkyl side groups are the two key structural factors governing the chain organization into highly ordered assemblies. The most favorable structures are those combining fluorene (indenofluorene) units with unsubstituted bithiophene (terthiophene) segments.