Synthesis and properties of conjugated oligomers containing fluorene, fluorenone, thiophene and cyclopentadithiophenone units
作者:Franklin Jaramillo-Isaza、Michael L. Turner
DOI:10.1039/b511349k
日期:——
Conjugated oligomers based on fluorene, fluorenone and thiophene derivatives have been prepared by parallel synthesis using the Suzuki cross-coupling reaction. These oligomers can be used as models of the corresponding fluorene copolymers and their structures were correlated with the observed optical and electrochemical behaviour. The long wavelength absorption bands observed for oligomers that contain fluorenone or cyclopentadithiophene units were assigned to an allowed π–π* transition associated with the carbonyl containing monomer unit. In addition the photoluminescence efficiency and the concentration dependence of the long wavelength emission band (>525 nm) for these materials strongly suggests that it can be attributed to emission involving fluorenone-based excimers.
基于芴、芴酮和噻吩衍生物的共轭低聚物通过采用铃木交叉耦合反应的平行合成方法制备。这些低聚物可用作相应芴共聚物的模型,其结构与观察到的光学和电化学行为相关联。含有芴酮或环戊二噻吩单元的低聚物观察到的长波长吸收带被归因于与含羰基单体单元相关的允许的π–π*跃迁。此外,这些材料的光致发光效率和长波长发射带(>525 nm)的浓度依赖性强烈表明,它可归因于涉及芴酮基激发二聚体的发射。