A doubly alkynylpyrene‐threaded [4] rotaxane that exhibits strong circularly polarized luminescence from the spatially restricted excimer
M Inouye, K Hayashi, Y Yonenaga… - Angewandte Chemie …, 2014 - Wiley Online Library
Angewandte Chemie International Edition, 2014•Wiley Online Library
The Sonogashira coupling of γ‐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 Φf= 0.37, arising
from the spatially restricted excimer within the cavity of the γ‐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 …
stopper molecules gave a doubly alkynylpyrene‐threaded [4] rotaxane. The rotaxane
showed only excimer emission, with a high fluorescence quantum yield of Φf= 0.37, arising
from the spatially restricted excimer within the cavity of the γ‐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 …
Abstract
The Sonogashira coupling of γ‐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 Φf=0.37, arising from the spatially restricted excimer within the cavity of the γ‐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.
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