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Synthesis of Bithiazole-Based Poly(arylenevinylene)s via Co-Catalyzed Hydroarylation Polyaddition and Tuning of Their
Boya Li1, Ryota Iwamori1, Junpei Kuwabara1,2
1Institute of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8573, Japan.
Abstract:
Bithiazole-based poly(arylenevinylene) is synthesized via the Co-catalyzed hydroarylation polyaddition of N,N,N',N'-tetrahexyl-(2,2'-bithiazole)-4,4'-dicarboxamide with 2,7-diethynyl-9,9-bis(2-ethylhexyl)fluorene in a regioselective manner. The introduction of the 2,2'-bithiazole unit deepens the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of the polymer compared to the analogous bithiophene-based poly(arylenevinylene). N-Methylation and N-oxidation of the thiazole moiety further deepen the HOMO and LUMO energy levels of the polymer, which is attributed to the enhanced electron-withdrawing effect. The N-oxidized polymer exhibits a high photoluminescence quantum yield and serves as an emitting material in an organic light-emitting diode, and its deep HOMO energy level efficiently restrains the trapping of holes in the host poly(vinylcarbazole) matrix.
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