title: Synthesis and characterization of alternating fluorene-thiophene copolymers bearing ethylene glycol side-chains.
abstract: New alternating fluorene-thiophene copolymers are introduced bearing polar ethylene glycol-carboxylate functionalities on the thiophene ring to achieve enhanced solubility in polar solvents. Suzuki polycondensation was applied to synthesize a set of three polymers with differing lengths of the ethylene glycol side-chains. The polymers are thermally stable up to temperatures of 300 °C. Solutions of the polymers in CHCl3show an absorption maximum at approximately 397 nm and a luminescence maximum of 472 nm in solutions with quantum yield of 30%. The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) levels have been determined to be at -5.7 and -2.6 eV, respectively.
authors.affiliation: Institute for Chemistry and Technology of Materials (ICTM) and Christian Doppler Laboratory for Nanocomposite Solar Cells, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria.
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Ziegler
authors.affiliation: Institute for Chemistry and Technology of Materials (ICTM) and Christian Doppler Laboratory for Nanocomposite Solar Cells, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria.
authors.forename: Andreas
authors.initials: A
authors.lastname: Pein
authors.affiliation: Institute for Chemistry and Technology of Materials (ICTM) and Christian Doppler Laboratory for Nanocomposite Solar Cells, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria.
authors.forename: Achim
authors.initials: A
authors.lastname: Fischereder
authors.affiliation: Institute for Chemistry and Technology of Materials (ICTM) and Christian Doppler Laboratory for Nanocomposite Solar Cells, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria.
authors.forename: Gregor
authors.initials: G
authors.lastname: Trimmel
keywords: Conjugated polymers; Luminescence; One-pot synthesis; Optical properties; Polycondensation