Abstract
The Sonogashira coupling of g -CD-encapsulated alkynylpyrenes with terphenyl-type stopper molecules gave a doubly alkynylpyrene-threaded [4]rotaxane. The rotaxane showed only excimer emission, with a high fluorescence quantum yield of Fcy f = 0.37, arising from the spatially restricted excimer within the cavity of the g-CD. The excimer emission suffered little from self-quenching up to a concentration of 1.5 × 10×5 m and was circularly polarized with a high glum value of -1.5 × 10-2. The strong circularly polarized luminescence may result from the two stacked pyrenes existing in the rotaxane in an asymmetrically twisted manner.
Original language | English |
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Pages (from-to) | 14392-14396 |
Number of pages | 5 |
Journal | Angewandte Chemie - International Edition |
Volume | 53 |
Issue number | 52 |
DOIs | |
State | Published - 2014/12/22 |
Keywords
- Chirality
- Circularly polarized luminescence
- Cyclodextrins
- Excimer emission
- Rotaxanes
ASJC Scopus subject areas
- Catalysis
- General Chemistry