Title
Circularly polarized luminescence and controllable helical self-assembly of an aggregation-induced emission luminogen
Author
Hongkun Li, Wei Yuan, Hexiang He, Zhihui Cheng, Canlong Fan, Yonggang Yang, Kam Sing Wong, Yongfang Li, Ben Zhong Tang
Year
2016
Journal
Dyes and Pigments
Abstract
A new chiral tetraphenylethene derivative with two l-leucine-containing attachments, TPE-DLEU, has been designed and synthesized by Cu(I)-catalyzed azide-alkyne cycloaddition “click” reaction. It emits faintly and gives weak circular dichroism (CD) signals in solutions, but shows strong fluorescence and Cotton effects in the aggregated state, showing aggregation-induced emission (AIE) and CD (AICD) characteristics. Furthermore, its film displays circularly polarized luminescence (CPL) with an emission dissymmetry factor of +3.2 × 10−3. Interestingly, TPE-DLEU exhibits controllable helical self-assembly behaviours. It could readily assemble into right-handed helical nanofibers upon the evaporation of its 1,2-dichloroethane (DCE) solution, but form left-handed helical nanofibers by the addition of hexane to its DCE solution.
Instrument
J-815
Keywords
Circular dichroism, Stereochemistry, Aggregation, Solid-state, Materials