Preparation and properties of alternating 2,7-linked carbazole copolymers with phenylene units with varying number of fluorine substituents
- 159 Downloads
New alternating copolymers comprising 2,7-linked-3,6-dimethyl-9-(2-hexyldecy)-9H-carbazole and 1,4-phenylene units (P1), 2,5-difluoro-1,4-phenylene units (P2), and 2,3,5,6-tetrafluoro-1,4-phenylene units (P3) have been prepared using Suzuki cross-coupling conditions. The polymers were characterized by NMR spectroscopy, UV–vis absorption spectroscopy, fluorescence spectroscopy, and their weight-average molecular weights were estimated using gel permeation chromatography. The polymers are thermally stable up to 420 °C and display wide band gaps ranging from 3.16 to 3.2 eV. The polymers are electrolytically stable and emit around 400 nm. A discussion on the effect of the varying degree of fluorine substitution of the phenylene repeat units in polymers P1–P3 on their physical properties is presented.
KeywordsRepeat Unit Carbazole Phenylboronic Acid Aromatic Region Tetrabutylammonium Perchlorate
We would like to acknowledge EPSRC (Grant number GR/S56719/01) for financial support of this work.