Synthesis, characterization, and structure-property relationship of novel fluorene-thiophene-based conjugated copolymers

被引:174
作者
Liu, B
Yu, WL
Lai, YH
Huang, W
机构
[1] Natl Univ Singapore, Dept Chem, Singapore 119260, Singapore
[2] Natl Univ Singapore, IMRE, Singapore 117602, Singapore
关键词
D O I
10.1021/ma000866p
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
A novel series of soluble alternating conjugated copolymers comprised of 9,9-dihexylfluorene and substituted bithiophene or thiophene moieties were synthesized by palladium-catalyzed Suzuki coupling reaction. In the backbone structure of the polymers, the thiophene rings in the bithiophene moieties are beta -substituted with decyl chains, and the bithiophene moieties are in two different coupling configurations of head-to-head and tail-to-tail regioregularities. For the thiophene moieties, they are either mono- or disubstituted with decyl chains. By means of the controllable structure modifications, the electronic properties of the polymers were tuned. In addition, the structure-property relationship of the backbone structure was studied. All of the polymers demonstrate efficient blue-to-green light emission, good ther mal stability, and relatively high glass transition temperatures (T-g similar to 78 degreesC). For the green-light-emitting polymers comprised of bithiophene moieties, their optical and electrochemical properties are independent of the coupling configurations of the substituted bithiophene moieties, whereas the head-to-head regularity demonstrates higher glass transition temperature and better environmental stability. As for the polymers composed of thiophene moieties, the monosubstitution of a decyl chain on the beta -position of thiophene ring produces bluish green emission with high fluorescence quantum efficiency (0.65 in solution). The second attachment of a decyl chain on another beta -position of thiophene ring pushes the emission to the blue region with reduced fluorescence quantum efficiency (0.39 in solution). The effort of synthesizing the polymers with the bithiophene moieties through FeCl3 oxidative polymerization is also reported.
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页码:8945 / 8952
页数:8
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