Cyanostilben-based derivatives: mechanical stimuli-responsive luminophors with aggregation-induced emission enhancement

Cyanostilbene derivatives with the aggregation-induced emission enhancement (AIEE) activity are prepared by Knoevenagel and Suzuki reactions. Among them, the dye ( Z )-2,3-bis(4′-(diphenylamino)-[1,1′-biphenyl]-4-yl)acrylonitrile ( CNS-4 ) nanoparticle suspension shows the polarity-dependent charact...

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Bibliographic Details
Published in:Photochemical & photobiological sciences 2012-09, Vol.11 (9), p.1414-1421
Main Authors: Zhang, Yujian, Sun, Jingwei, Bian, Gaofeng, Chen, Yiyi, Ouyang, Mi, Hu, Bin, Zhang, Cheng
Format: Article
Language:English
Subjects:
Biochemistry
Biomaterials
Chemistry
Physical Chemistry
Plant Sciences
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Summary:Cyanostilbene derivatives with the aggregation-induced emission enhancement (AIEE) activity are prepared by Knoevenagel and Suzuki reactions. Among them, the dye ( Z )-2,3-bis(4′-(diphenylamino)-[1,1′-biphenyl]-4-yl)acrylonitrile ( CNS-4 ) nanoparticle suspension shows the polarity-dependent characteristics of the fluorescence properties. By the fluorescence spectroscopy and transmission electron microscopy (TEM) analysis, the restriction of transfer from the local excited (LE) state to the intramolecular charge-transfer (ICT) state and crystal formation results in a blue-shift in emission and enhances the intensity in the aggregate state. Additionally, the luminophors CNS-3 and CNS-4 possess the AIEE effect as well as mechanochromic fluorescent properties. This mechanofluorochromic behavior originates from the change between the crystalline and the amorphous state.
ISSN:1474-905X
1474-9092
DOI:10.1039/c2pp05404c