Circularly Polarized Luminescence of Chiral Perylene Diimide Based Enantiomers Triggered by Supramolecular Self-Assembly
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- 作者：Fei Li ; Yunzhi Li ; Guo Wei ; Yuxiang Wang ; Prof. Shuhua Li and Prof. Yixiang Cheng
- 刊名：Chemistry - A European Journal
- 出版年：2016
- 出版时间：August 26, 2016
- 年：2016
- 卷：22
- 期：36
- 页码：12910-12915
- 全文大小：1511K
- ISSN：1521-3765
文摘
Two perylene diimide (PDI) enantiomers (d/l-PDI) incorporating the d/l-alanine moiety have been designed and synthesized. d/l-PDI in chloroform displays bright-yellow fluorescence that is redshifted to orange-red when the solvent contains a methanol fraction of 99 vol %. No circular dichroism (CD) or circularly polarized luminescence (CPL) signals were observed for d/l-PDI enantiomers in CHCl3. Interestingly, the d/l-PDI enantiomers exhibit clear mirror-image Cotton effects and CPL emission in the aggregate state. The optical anisotropy factor (glum) is as high as 0.02 at fm=99 %, which can be attributed to self-assembly through intermolecular π–π interactions in the aggregate state.