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线性共轭齐聚物共轭单元依赖的光学特性(英文)
π-Conjugated Unit-Dependent Optical Properties of Linear Conjugated Oligomers
【摘要】 研究三种线性共轭齐聚物(F-P、F-P-F和P-F-P-F-P)的光学特性,其中吩噻嗪单元(F)和芴单元(P)交替排列.随着共轭体系的增强,它们的吸收和发射带都逐渐红移,双光子吸收特性明显的改进.利用连续速率分布模型分析荧光动力学的结果显示,它们的弛豫速率在逐渐增加,速率分布宽度也在变窄.量子化学计算给出了它们的分子结构和跃迁机制,显示π共轭系统的增强促使了双光子特性的改进。
【Abstract】 The optical properties of three linear conjugated oligomers(F-P, F-P-F, and P-F-P-F-P),where phenothiazine(P) and fluorene(F) groups arrange alternately, are investigated. With the enhancement of the π-conjugated system, their absorption and emission bands both gradually red shift, and their two-photon properties are also improved. Meanwhile, their fluorescence dynamic traces are analyzed with continuous rate distribution model, exhibiting that their decay rates gradually accelerate and the rate distribution width become narrower.The quantum chemical calculation offers their molecular structures and transition mechanism, showing that the enhancement of π-conjugated system should be responsible for the improvement of two-photon properties.
- 【文献出处】 Chinese Journal of Chemical Physics ,化学物理学报(英文版) , 编辑部邮箱 ,2014年03期
- 【分类号】O631.24