Effect of Transannular - Interaction on Emission Spectral Shift and Fl
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- 作者：Wei-Ling Wang ; Jianwei Xu ; Zhe Sun ; Xinhai Zhang ; Yong Lu ; Yee-Hing Lai
- 刊名：Macromolecules
- 出版年：2006
- 出版时间：October 17, 2006
- 年：2006
- 卷：39
- 期：21
- 页码：7277 - 7285
- 全文大小：229K
- 年卷期：v.39,no.21(October 17, 2006)
- ISSN：1520-5835
文摘
A series of dithia[3.3]paracyclophane-fluorene copolymers 1a-c and 3-5 were synthesized bya palladium-catalyzed reaction between 9,9-di-n-hexylfluorene-2,7-bis(trimethylene boronate) and the correspondingdithiacyclophane precursors. The transannular 
- interaction in the dithiaparacyclophane modified the electronicand optical properties of the copolymers significantly, resulting in emission red shifts relative to a referencepolymer 2. The observed shift in 1a and 5 was accompanied by enhanced photoluminescence (PL) efficiency,whereas that in 1b, 1c, 3, and 4 experienced a significant to nearly complete fluorescence quenching. The quenchingeffect is likely to involve an electron-transfer process and could be correlated qualitatively to the reduction potentialof the "external" aromatic moiety in the cyclophane unit.
- interaction in the dithiaparacyclophane modified the electronicand optical properties of the copolymers significantly, resulting in emission red shifts relative to a referencepolymer 2. The observed shift in 1a and 5 was accompanied by enhanced photoluminescence (PL) efficiency,whereas that in 1b, 1c, 3, and 4 experienced a significant to nearly complete fluorescence quenching. The quenchingeffect is likely to involve an electron-transfer process and could be correlated qualitatively to the reduction potentialof the "external" aromatic moiety in the cyclophane unit.