Oligo(3,6-phenanthrene ethynylenes): Synthesis, Characterization, and Photoluminescence
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- 作者：Jichao Li ; Gongfang Hu ; Ningning Wang ; Tao Hu ; Qiaodong Wen ; Ping Lu ; Yanguang Wang
- 刊名：The Journal of Organic Chemistry
- 出版年：2013
- 出版时间：April 5, 2013
- 年：2013
- 卷：78
- 期：7
- 页码：3001-3008
- 全文大小：462K
- 年卷期：v.78,no.7(April 5, 2013)
- ISSN：1520-6904
文摘
A series of highly fluorescent, oligo(3,6-phenanthrene ethynylenes) (F1鈥?b>F7) were synthesized, and their photophysical behavior was systematically investigated. They emitted light with highly emissive quantum yields, up to 0.92. Emissive wavelengths of these compounds relied on the number of phenanthrene blocks existing in the oligomers. Red-shifted emissions were observed as the number of phenanthrenes increased. On the basis of theoretical calculations, helical structures could be formed for F4鈥?b>F7, indicating that the excimer emissions might be observed for F4鈥?b>F7 due to the intramolecular 蟺鈥撓€ stackings of phenanthrenes in the helical structures. However, excimer emissions were only observed for F5鈥?b>F7 in dilute cyclohexane and for F6 and F7 in dilute methylene chloride, respectively. No excimer emission was observed for F4鈥?b>F7 in dilute tetrahydrofuran due to the degree of solvation.