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Title: Poly[2,7-(9,9-dihexylfluorene)-alt-pyridine] with donor-acceptor architectures: A new series of blue-light-emitting alternating copolymers
Authors: Liu, S.-P. 
Chan, H.S.O. 
Siu-Choon, N.G. 
Keywords: Blue-emitting alternating polymers
Conjugated polyfluorene derivatives
Palladium (0)-catalyzed Suzuki cross-coupling reaction
Issue Date: 1-Oct-2004
Citation: Liu, S.-P., Chan, H.S.O., Siu-Choon, N.G. (2004-10-01). Poly[2,7-(9,9-dihexylfluorene)-alt-pyridine] with donor-acceptor architectures: A new series of blue-light-emitting alternating copolymers. Journal of Polymer Science, Part A: Polymer Chemistry 42 (19) : 4792-4801. ScholarBank@NUS Repository.
Abstract: A novel series of well-defined alternating poly[2,7-(9,9-dihexylfluorenyl)-alt-pyridinyl] (PDHFP) with donor-acceptor repeat units were synthesized using palladium (0)-catalyzed Suzuki cross-coupling reactions in good to high yields. In this series of alternating polymers, 2,7-(9,9-dihexylfluorenyl) was used as the light emitting unit, and the electron deficient pyridinyl unit was employed to provide improved electron transportation. These polymers were characterized by 1H-NMR and 13C-NMR, gel permeation chromatography (GPC), thermal analyses, and UV-vis and fluorescence spectroscopy. The glass transition temperature of copolymers in nitrogen ranged from 110 to 148°C, and the copolymers showed high thermal stabilities with high decomposition temperatures in the range of 350 to 390°C in air. The difference in linkage position of pyridinyl unit in the polymer backbone has significant effects on the electronic and optical properties of polymers in solution and in film phases. Meta-linkage (3,5- and 2,6-linkage) of pyridinyl units in the polymer backbone is more favorable to polymer for pure blue emission and prevention of aggregation of polymer chain than para-linkage (2,5-linkage) of the pyridinyl units. © 2004 Wiley Periodicals, Inc.
Source Title: Journal of Polymer Science, Part A: Polymer Chemistry
ISSN: 0887624X
DOI: 10.1002/pola.20294
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