A Doubly Alkynylpyrene-Threaded [4]Rotaxane That Exhibits Strong Circularly Polarized Luminescence from the Spatially Restricted Excimer
A Doubly Alkynylpyrene-Threaded [4]Rotaxane That Exhibits Strong Circularly Polarized Luminescence from the Spatially Restricted Excimer
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DOI：
10.1002/anie.201408193
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发表时间：
2014-12-22
影响因子：
16.6
通讯作者：
Nozaki, Koichi
中科院分区：
文献类型：
--
作者：
Inouye, Masahiko;Hayashi, Koichiro;Nozaki, Koichi
γ-CD包封的炔基芘与三联苯型终止分子的Sonogashira偶联得到双炔基芘螺纹[4]轮烷。轮烷只显示出受激准分子发射，具有Phi（f）=0.37的高荧光量子产率，这是由γ-CD腔内的空间受限受激准分子引起的。激基缔合物发射在浓度高达1.5 × 10 ~（-5）M时几乎不受自猝灭的影响，并且是圆偏振的，g（lum）值高达-1.5 × 10 ~（-2）。这种强圆偏振发光可能是由于轮烷中存在的两个非对称扭曲的芘堆叠结构所致。
The Sonogashira coupling of gamma-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 Phi(f)=0.37, arising from the spatially restricted excimer within the cavity of the gamma-CD. The excimer emission suffered little from self-quenching up to a concentration of 1.5 x 10(-5) M and was circularly polarized with a high g(lum) value of -1.5 x 10(-2). The strong circularly polarized luminescence may result from the two stacked pyrenes existing in the rotaxane in an asymmetrically twisted manner.