Abstract
A series of novel soluble conjugated copolymers consisting of coplanar donor (bithiophenevinyl)−acceptor (2-pyran-4-ylidenemalononitrile) (TVM)-based unit coupled to different electron-donating ability moieties were synthesized by Suzuki coupling polymerization. The structures of the copolymers were characterized, and their physical properties were investigated. High molecular weight (Mn up to 43.8 kg/mol) and thermostable copolymers were obtained. The combination of TVM unit building block with gradually increased electron-donating ability moieties results in enhanced π−π stacking in solid state and intramolecular charge transfer (ICT) transition bands, which lead to an extension of their absorption spectral range. Cyclic voltammetry measurement displayed that the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of the copolymers can be fine-tuned. The resulting copolymers possessed relatively low HOMO energy levels promising good air stability and hi...
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