Poly[2,7-(9,9-dihexylfluorene)-alt-pyridine] with donor-acceptor architectures: A new series of blue-light-emitting alternating copolymers

• Published in: Journal of polymer science. Part A, Polymer chemistry Vol. 42; no. 19; pp. 4792 - 4801
• Main Authors: Liu, Shou-Ping, Chan, Hardy S. O., Ng, Siu-Choon
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 01-10-2004; Wiley
• Subjects: Applied sciences; blue-emitting alternating polymers; conjugated polyfluorene derivatives; Exact sciences and technology; Organic polymers; palladium -catalyzed Suzuki cross-coupling reaction; Physicochemistry of polymers; Polymers with particular properties; Preparation, kinetics, thermodynamics, mechanism and catalysts; conjugated polyfluorene derivatives; Solution polycondensation; blue-emitting alternating polymers; palladium -catalyzed Suzuki cross-coupling reaction; Pyridine copolymer; Fluorescence; Experimental study; Conjugated copolymer; Optical properties; Preparation; Aromatic copolymer; Alternating copolymer; Blue light; Fluorene derivative copolymer; Optical absorption
• ISSN: 0887-624X; 1099-0518
• DOI: 10.1002/pola.20294

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. J Polym Sci Part A: Polym Chem 42: 4792–4801, 2004
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. Meta‐linkage (3,5‐ or 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.